...Lixin Gu; Sen Hu; Mahesh Anand; Xu Tang; Jianglong Ji; Bin Zhang; Nian Wang; Yangting Lin Abstract We report on the discovery of two high-pressure minerals, tuite and ahrensite, located in two small shock-induced melt pockets (SIMP 1 and 2) in the Zagami martian meteorite, coexisting with granular...

... are heavily deformed with an angular mosaicity reaching 7 degrees. The latter imply that the mineral grains experienced a shock event but the impact pressure was not high enough (<23 GPa) for the transformation to tuite, γ-Ca 3 (PO 4 ) 2 , to occur. Ferromerrillite is colourless, no cleavage was observed...

...Shuangmeng Zhai; Daisuke Yamazaki; Weihong Xue; Lijin Ye; Chaowen Xu; Shuangming Shan; Eiji Ito; Akira Yoneda; Takashi Yoshino; Xinzhuan Guo; Akira Shimojuku; Noriyoshi Tsujino; Ken-Ichi Funakoshi Abstract Tuite, γ-Ca 3 (PO 4 ) 2 , is regarded as an important phosphate mineral in the deep mantle...

...Richard M. Thompson; Xiande Xie; Shuangmeng Zhai; Robert T. Downs; Hexiong Yang Abstract Tuite, the high-pressure γ-form of the Ca 3 (PO 4 ) 2 system, has been synthesized from chlorapatite at 15 GPa and 1300 °C using a multi-anvil apparatus. Its crystal structure was determined with single-crystal...

...Xiande XIE; Michelle E. MINITTI; Ming CHEN; Ho-Kwang MAO; Deqiang WANG; Jinfu SHU; Yingwei FEI Abstract Tuite, γ-Ca 3 (PO 4 ) 2 , the high-pressure polymorph of whitlockite, was found in a shock melt vein of the Suizhou chondrite. It occurs as polycrystalline aggregates in association with coarse...

...KELSEY R. MOORE; THEODORE M. PRESENT; FRANK PAVIA; JOHN P. GROTZINGER; JOSEPH RAZZELL HOLLIS; SUNANDA SHARMA; DAVID FLANNERY; TANJA BOSAK; MICHAEL TUITE; ANDREW H. KNOLL; KENNETH WILLIFORD Abstract The preservation of organic biosignatures during the Proterozoic Eon required specific taphonomic...

... and heterovalent isomorphic substitution scheme M + + T 6+ ↔ M 2+ + T 5+ , the palmierite supergroup can be formally divided into two groups: the palmierite group M 1 2+ M 2 2 + ( T 6+ O 4 ) 2 , and the tuite group M 1 2+ M 2 2 2+ ( T 5+ O 4 ) 2 . Currently, the palmierite group includes palmierite K 2 Pb(SO 4 ) 2...

...Michael L. Tuite, Jr.; Stephen A. Macko Abstract The depleted nitrogen isotope values observed in Devonian black shales have been ascribed to the dominant role of marine diazotrophic N fixation in providing new reactive N for the productivity that generated the organic matter preserved...

... in SO 3 (2.03 wt%). Merrillite from lower-mantle diamonds may be a retrograde phase of the tuite [γ-Ca 3 (PO 4 ) 2 ]. Owing to their crystal structures, both merrillite and tuite may be important potential hosts for rare earth elements (REE) and large ion lithophile elements (LILE), including Sr and Ba...