Mineralogical Society of America

The Mineralogical Society of America (MSA) is professional membership organization open to any person interested in mineralogy, crystallography, geochemistry, petrology, or any allied science. The membership is international, and there is an appropriate grade of membership for every phase of your scientific and professional life, from student to retirement.

American Mineralogist:Yang et al. (page 878) carried out in situ high-temperature and high-pressure IR spectroscopic inv...
07/05/2019
Re-configuration and interaction of hydrogen sites in olivine at high temperature and high pressure | American Mineralogist | GeoScienceWorld

American Mineralogist:
Yang et al. (page 878) carried out in situ high-temperature and high-pressure IR spectroscopic investigations on hydrogen storage sites in the natural olivine and synthetic Fe-free forsterite. The results show that hydrogen does not transfer between storage sites with increasing temperature, but displays disordering at temperatures over 600 °C. In contrast, pressure can induce re-configuration of hydrogen storage sites corresponding to the 3610 and 3579 cm–1 bands. Hydrogen storage sites also exhibit disordering at high pressure. In addition, the dehydrogenation experiments of the natural olivine indicate interactions of hydrogen storage sites. Protons released from titanium-clinohumite defects move to pure Si vacancies, and also to Mg vacancies coupling with trivalent cations. This study is of importance to understand water distribution and its impact on the upper mantle.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/6/878/570852/re-configuration-and-interaction-of-hydrogen-sites?redirectedFrom=fulltext

Yan Yang, Wendi Liu, Zeming Qi, ZhongPing Wang, Joseph R. Smyth, Qunke Xia; Re-configuration and interaction of hydrogen sites in olivine at high temperature and high pressure. American Mineralogist ; 104 (6): 878–889. doi: https://doi.org/10.2138/am-2019-6921

American Mineralogist:Yoder et al. (page 869) have explored the IR spectra of carbonated calcium and strontium apatites ...
07/04/2019
effect of incorporated carbonate and sodium on the IR spectra of A- and AB-type carbonated apatites | American Mineralogist | GeoScienceWorld

American Mineralogist:
Yoder et al. (page 869) have explored the IR spectra of carbonated calcium and strontium apatites that contain carbonate in the channel (A-type substitution) as well as in both the channel and in place of phosphate (B-type substitution). The results show that a correlation of the band position of the high frequency A-type carbonate band with weight percent carbonate exists for the calcium apatites, whereas a correlation of the band positions of both the low and high frequency B-type carbonate bands with carbonate weight percent occurs for the strontium apatites. On the other hand, correlations of band frequencies with sodium content are weaker than those for carbonate, even though carbonate and sodium are correlated with each other in the calcium apatites. This study also confirms previous conclusions about the distribution of A and B-type carbonate for most synthetic calcium apatites formed under a wide range of temperature and pressure conditions.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/6/869/570841/the-effect-of-incorporated-carbonate-and-sodium-on?redirectedFrom=fulltext

Claude H. Yoder, Melissa M. Bollmeyer, Kathleen R. Stepien, Robyn N. Dudrick; The effect of incorporated carbonate and sodium on the IR spectra of A- and AB-type carbonated apatites. American Mineralogist ; 104 (6): 869–877. doi: https://doi.org/10.2138/am-2019-6800

American Mineralogist:Heller et al. (page 857) explore the possibilities of estimating radiation damage (a-dose) in tita...
07/03/2019
Estimation of radiation damage in titanites using Raman spectroscopy | American Mineralogist | GeoScienceWorld

American Mineralogist:
Heller et al. (page 857) explore the possibilities of estimating radiation damage (a-dose) in titanites using Raman spectroscopy. Raman spectra of randomly oriented titanite fragments with known thermal history were related to their a-dose, calculated from the concentration of a-emitting elements. The intensity-weighted mean width of all Raman bands of a spectrum is independent from orientation and proves to be the most robust measure of a-dose. This approach provides a pre-selection method to optimize the range of a-doses of titanite crystals to be dated by (U-Th)/He thermochronology.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/6/857/570848/estimation-of-radiation-damage-in-titanites-using?redirectedFrom=fulltext

Beatrix Muriel Heller, Nils Keno LüNsdorf, István Dunkl, Ferenc Molnár, Hilmar von Eynatten; Estimation of radiation damage in titanites using Raman spectroscopy. American Mineralogist ; 104 (6): 857–868. doi: https://doi.org/10.2138/am-2019-6681

American Mineralogist:Wood et al. (page 844) recalculated the temperatures at which the so-called "moderately volatile e...
07/02/2019
condensation temperatures of the elements: A reappraisal | American Mineralogist | GeoScienceWorld

American Mineralogist:
Wood et al. (page 844) recalculated the temperatures at which the so-called "moderately volatile elements" such as Zn, In, Tl, Ga, Ag, Sb, Pb, and Cl, would condense from a gas of solar composition at 10-4 bar during formation of the solar system. The calculations highlighted three areas where currently available estimates of condensation temperature could be improved. The newly calculated 50% condensation temperatures are generally similar to or, because of the improvements, lower than those of Lodders (2003). Thus, this work provides a more accurate measure of the relative volatilities of the elements at the earliest stages of planetary formation.
https://pubs.geoscienceworld.org/msa/ammin/article/104/6/844/570842/The-condensation-temperatures-of-the-elements-A

Bernard J. Wood, Duane J. Smythe, Thomas Harrison; The condensation temperatures of the elements: A reappraisal. American Mineralogist ; 104 (6): 844–856. doi: https://doi.org/10.2138/am-2019-6852CCBY

American Mineralogist:Papike et al. (page 838) investigated the effects of contrasting Ti and Al activities on Mn/Fe sys...
07/01/2019
effects of contrasting Ti and Al activities on Mn/Fe systematics in pyroxene from lunar mare basalts | American Mineralogist | GeoScienceWorld

American Mineralogist:
Papike et al. (page 838) investigated the effects of contrasting Ti and Al activities on Mn/Fe systematics in pyroxene from lunar mare basalts. In terms of using Mn/Fe ratios for determining planetary parentage and the reasons for dispersion in this trend for each body, variation in oxygen fugacity appears to be the most important factor for Martian basalts. For lunar mare basalts, however, high Ti activity in the melting zone and the melts, and crystallization sequence differences among high-Ti, low-Ti, and very low-Ti basalts account for almost all of the observed dispersion in the Mn/Fe ratios. This study gives important insight into the challenges of establishing planetary parentage by use of Mn/Fe ratios in lunar pyroxene, and explores the effects of crystallization sequence (order of appearance on liquidus) on this parameter.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/6/838/570843/the-effects-of-contrasting-ti-and-al-activities-on?redirectedFrom=fulltext

James J. Papike, Steven B. Simon, Charles K. Shearer; The effects of contrasting Ti and Al activities on Mn/Fe systematics in pyroxene from lunar mare basalts. American Mineralogist ; 104 (6): 838–843. doi: https://doi.org/10.2138/am-2019-6875

American Mineralogist:Stangarone et al. (page 830) used density functional theory (DFT) simulations of the structures of...
06/28/2019
New insights into the zircon-reidite phase transition | American Mineralogist | GeoScienceWorld

American Mineralogist:
Stangarone et al. (page 830) used density functional theory (DFT) simulations of the structures of zircon and reidite (polymorphs of ZrSiO4) to show that above 20 GPa zircon undergoes a displacive phase transition to a new polymorph (space group I-42d) which may trigger the reconstructive transformation to reidite. Thus, this study provides new insights into the zircon-reidite transition, which may be induced by shock in meteorite impacts. The results clarify the discrepancies between previous observations on natural and experimental samples.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/6/830/570845/new-insights-into-the-zircon-reidite-phase?redirectedFrom=fulltext

Claudia Stangarone, Ross J. Angel, Mauro Prencipe, Boriana Mihailova, Matteo Alvaro; New insights into the zircon-reidite phase transition. American Mineralogist ; 104 (6): 830–837. doi: https://doi.org/10.2138/am-2019-6827

American Mineralogist:Putirka and Rarick (page 817) survey the compositions and mineralogy of >4000 nearby stars from th...
06/27/2019
composition and mineralogy of rocky exoplanets: A survey of >4000 stars from the Hypatia Catalog | American Mineralogist | GeoScienceWorld

American Mineralogist:
Putirka and Rarick (page 817) survey the compositions and mineralogy of >4000 nearby stars from the Hypatia Catalog (the most compositionally broad of such collections) to determine whether such exoplanets might be geologically similar to Earth. They find that most exoplanets will have rocky compositions that are similar to Earth and so most exoplanets might exhibit plate tectonics, and so might also be Earth-like in other respects, for example, by harboring life.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/6/817/570844/the-composition-and-mineralogy-of-rocky-exoplanets?redirectedFrom=fulltext

Keith D. Putirka, John C. Rarick; The composition and mineralogy of rocky exoplanets: A survey of >4000 stars from the Hypatia Catalog. American Mineralogist ; 104 (6): 817–829. doi: https://doi.org/10.2138/am-2019-6787

06/26/2019

American Mineralogist:
In his Roebling Medal Paper, Hazen (page 810) describes a classification of planetary materials based on natural kind clustering. Minerals reveal the nature of the co-evolving geosphere and biosphere through billions of years of Earth history. Mineral classification systems have the potential to elucidate this rich evolutionary story; however, the present mineral taxonomy, based as it is on idealized major element chemistry and crystal structure, lacks a temporal aspect and thus cannot reflect planetary evolution. A complementary evolutionary system of mineralogy based on the quantitative recognition of "natural kind clustering" for a wide range of condensed planetary materials with different paragenetic origins (best revealed through the data-driven methods of cluster analysis) has the potential to amplify, though not supersede, the present classification system.
https://pubs.geoscienceworld.org/msa/ammin/article/104/6/810/570840/An-evolutionary-system-of-mineralogy-Proposal-for

American Mineralogist:Dunn et al. (page 791) performed calcite-graphite carbon isotope thermometry on 150 marble samples...
06/25/2019
Geothermometry of the western half of the Central Metasedimentary Belt, Grenville Province, Ontario, and its implications | American Mineralogist | GeoScienceWorld

American Mineralogist:
Dunn et al. (page 791) performed calcite-graphite carbon isotope thermometry on 150 marble samples from the western Central Metasedimentary Belt (CMB) of the Ontario segment of the Grenville Province, which represents the deeply eroded and exposed core of a major mountain chain that existed one billion years ago. The obtained data show a gradual increase in the peak metamorphic temperature from 700 °C along the western margin of the CMB. These results refine our understanding of orogenic buildup and collapse in the Grenville, including the styles of deformation of crystalline rocks in continental crust. The authors also found unusually high carbon isotope ratios (13C/12C) in the sample which provides a useful chemical marker to correlate rocks that formed in similar marine settings at around the same time roughly 1.3 billion years ago, well before the large mountain-building event.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/6/791/570854/geothermometry-of-the-western-half-of-the-central?redirectedFrom=fulltext

Steven R. Dunn, Michelle J. Markley, Maneh Kotikian, Kay Achenbach, Bo Montanye, William H. Peck; Geothermometry of the western half of the Central Metasedimentary Belt, Grenville Province, Ontario, and its implications. American Mineralogist ; 104 (6): 791–809. doi: https://doi.org/10.2138/am-201...

American Mineralogist June issue:This issue of American Mineralogist starts with an interesting and thoughtful Editorial...
06/24/2019
Why scientists should study chess | American Mineralogist | GeoScienceWorld

American Mineralogist June issue:
This issue of American Mineralogist starts with an interesting and thoughtful Editorial by the former Editor Keith Putirka (page 785): Why scientists should study chess.
https://pubs.geoscienceworld.org/msa/ammin/article/104/6/785/570850/Why-scientists-should-study-chess

Keith D. Putirka; Why scientists should study chess. American Mineralogist ; 104 (6): 785–787. doi: https://doi.org/10.2138/am-2019-Ed104611

06/24/2019

The Centennial talks were awesome and thought-provoking. Thank you to the organizers and sponsors for making an excellent conference possible.

06/19/2019

the Centennial begins tomorrow!

06/14/2019

MSA Annual Meeting
Abstract Deadline: 25 June 2019. (Next week!)

At the 2019 GSA Meeting, Phoenix AZ, USA, 22-25 September 2019. MSA and GSA's Mineralogy, Geochemistry, Petrology, and Volcanology Division are sponsoring 32 sessions.

GEMS & GEMOLOGYGems & Gemology (Spring 2019, v.55 n.1) issue includes articles on "A New Method for Determining Gem Tour...
06/13/2019
Spring 2019 Gems & Gemology | The Quarterly Journal of the Gemological Institute of America

GEMS & GEMOLOGY
Gems & Gemology (Spring 2019, v.55 n.1) issue includes articles on "A New Method for Determining Gem Tourmaline Species by LA-ICP-MS", "Provenance Discrimination of Freshwater Pearls by LA-ICP-MS and Linear Discriminant Analysis (LDA)", "Pleochroism and Color Change in Faceted Alexandrite: Influence of Cut and Sample Orientation", "Corundum with Spinel Corona", and "U-Pb Ages of Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic Origin".
https://www.gia.edu/gems-gemology

Gems & Gemology is the quarterly scientific journal of the Gemological Institute of America.

06/12/2019

Short Course: Reactive Transport in Natural and Engineered Systems
August 17-18, 2019, Barcelona, Spain, before the Goldschmidt Conference. Organizers: Jennifer L. Druhan, University of Illinois and Christophe Tournassat, French Geological Survey, Orléans (BRGM). This workshop will cover the diversity of applications which have developed since the 1996 RiMG volume 34 on reactive transport, with emphasis on principles now employed to address a wide variety of natural and engineered systems across diverse spatial and temporal scales, in tandem with advances in computational capacity, quantitative imaging and reactive interface characterization techniques.
https://goldschmidt.info/2019/

06/10/2019

MSA members: Please check your email for information on the MSA election for officers.

06/10/2019

American Mineralogist:
Bindi et al. (p. 775) report the first natural occurrence and single-crystal X-ray diffraction study of the Fe-analogue of wadsleyite [a = 5.7485(4), b = 11.5761(9), c = 8.3630(7) Å;, V = 556.52(7) Å3; space group Imma], spinelloid-structured Fe2SiO4, a missing phase among the predicted high-pressure polymorphs of ferroan olivine, with the composition (Fe2+1.10Mg0.80Cr3+0.04Mn2+0.02Ca0.02Al0.02Na0.01)Σ2.01(Si0.97Al0.03)Σ1.00O4. The new mineral was approved by the International Mineralogical Association (No. 2018-102) and named asimowite in honor of Paul D. Asimow, the Eleanor and John R. McMillan Professor of Geology and Geochemistry at the California Institute of Technology. It was discovered in rare shock-melted silicate droplets embedded in Fe,Ni-metal in both the Suizhou L6 chondrite and the Quebrada Chimborazo (QC) 001 CB3.0 chondrite. Asimowite is rare, but the shock-melted silicate droplets are very frequent in both meteorites and most of them contain Fe-rich wadsleyite (Fa30-45). Although the existence of such Fe-rich wadsleyite in shock veins may be due to the kinetic reasons, new theoretical and experimental studies of the stability of (Fe,Mg)2SiO4 at high temperature (> 1800 K) and pressure are clearly needed. This may also have a significant impact on the temperature and chemical estimates of the mantle's transition zone in Earth.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/5/775/570182/discovery-of-asimowite-the-fe-analog-of-wadsleyite?redirectedFrom=fulltext

06/07/2019

American Mineralogist:
Rezvukhin et al. (p. 761) recognized LILE-enriched chromium titanates of the magnetoplumbite (AM12O19) and crichtonite (ABC18T2O38) groups as abundant inclusions in orthopyroxene grains in a mantle-derived xenolith from the Udachnaya-East kimberlite pipe, Daldyn field, Siberian craton. The studied xenolith consists of three parts: an orthopyroxenite, a garnet clinopyroxenite, and a garnet-orthopyroxene intermediate domain between the two. Within the host enstatite (Mg# 92.6) in the orthopyroxenitic part of the sample, titanate inclusions are associated with Cr-spinel, diopside, rutile, Mg-Cr-ilmenite, and pentlandite. Crichtonite-group minerals also occur as lamellae inclusions in pyrope grains of the intermediate domain adjacent to the orthopyroxenite, as well as in interstitial-to-enstatite oxide intergrowths together with Cr-spinel, rutile, and ilmenite. Yimengite-hawthorneite inclusions in enstatite contain (wt%) 3.72-8.04 BaO, 2.05-3.43 K2O, and 0.06-0.48 CaO. Their composition is transitional between yimengite and hawthorneite end-members with most grains exhibiting K-dominant chemistry. A distinct feature of the studied yimengite-hawthorneite minerals is a high content of Al2O3 (5.74-7.69 wt%). Crichtonite-group minerals vary in composition depending on the occurrence in the xenolith: inclusions in enstatite are moderate-to-high in TiO2 (62.9-67.1 wt%), moderately Cr-rich (12.6-14.0 wt% Cr2O3), Ba- or K-specific in the A site, and contain low ZrO2 (0.05-1.72 wt%), whereas inclusions in pyrope are moderate in TiO2 (61.7-63.3 wt% TiO2), relatively low in Cr (8.98-9.62 wt% Cr2O3), K-dominant in the A site, and are Zr-enriched (4.64-4.71 wt% ZrO2). Crichtonite-group minerals in polymineralic oxide intergrowths show highly diverse compositions even within individual aggregates, where they are chemically dominated by Ba, Ca, and Sr. P-T estimates indicate the orthopyroxenite equilibrated at ~800 °C and 35 kbar. Preferentially oriented lamellae of enstatite-hosted Cr-spinel and diopside, as well as pyrope, diopside, and Cr-spinel grains developed around enstatite crystals, are interpreted to have been exsolved from the high-T, Ca-Al-Cr-enriched orthopyroxene precursor. The observed textural relationships between inclusions in enstatite and exotic titanate compositions imply that the studied orthopyroxenite has undergone metasomatic processing by a mobile percolating agent; this highly evolved melt/fluid was enriched in Ba, K, HFSE, and other incompatible elements. The prominent textural and chemical inhomogeneity of the interstitial oxide intergrowths is either a consequence of the metasomatic oxide crystallization shortly prior the kimberlite magma eruption, or arose from the intensive modification of pre-existing oxide clusters by the kimberlite melt during the Udachnaya emplacement. Our new data provide implications for the metasomatic treatment of orthopyroxenites in the subcontinental lithospheric mantle from the view of exotic titanate occurrences.
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/104/5/761/570185/a-new-occurrence-of-yimengite-hawthorneite-and?redirectedFrom=fulltext

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