Other dense silicates
Hexagonal barium ferrite-type CaAl2Si3.5O11 (HAS-phase)
Mineral name: zagamiite
Discovery: Zagami meteorite (shergottite), NWA856 meteorite (shergottite)
＊References＊
Ma C., Tschauner, O., and Beckett J. R. 2017. Lunar and Planetary Science:1128.pdf
Fudge C., Sharp T. G., Hu J., Ma C., Tschauner O., and Wittmann A. 2018. Lunar and Planetary Science: 2417.pdf.
Hexagonal barium ferrite-type CaAl4Si2O11 (CAS-phase)
Mineral name: donwilhelmsite (named after Don E. Wilhelms)
Discovery: Zagami meteorite (shergottite), Oued Awlitis 001 (lunar)
＊References＊
Irifune T., Ringwood A. E., and Hibberson W. O. 1994. Earth and Planetary Science Letters 126:351–368. (First synthesis）
Gautron L., Angel R. J., and Miletich R. 1999. Physics and Chemistry of Minerals 27:47–51. (X-ray structural refinement of synthetic single crystal)
Beck P., Gillet P., Gautron L., Daniel I., and El Goresy A. 2004. Earth and Planetary Science Letters 219:1–12. (Discovery)
Fritz J, Greshake A., Klementova M., Wirth R., Palatinus L., Trønnes R. G., Fernandes V. A., Böttger U. , and Ferrière, L. 2020. American Mineralogist, 105, 1704–1711. (Described as a new mineral species)
ZrSiO4 polymorphs
Scheelite-type ZrSiO4
Mineral name: reidite (named after Alan F. Reid)
Discovery: Upper Eocene impact ejecta layer in marine sediments on the upper continental slope off New Jersey and on Barbados
＊References＊
Reid A. F. and Ringwood, A. E. 1969. Earth and Planetary Science Letters 6:205–208. (First synthesis)
Kusaba K., Yagi T., Kikuchi M., and Syono Y. 1986. Journal of Physics and Chemistry of Solids 47:675–679. (First synthesis by shock recovery experiments)
Glass B.P. and Liu S. 2001. Geology 29:371–373. (Discovery)
Glass B. P., Liu S., and Leavens P. B. 2002. American Mineralogist 87:562–565. (Described as a new mineral species)
(Mg,Fe)Si2O5 polymorphs
＊References＊
Langenhorst F. and Poirier J. P. 2000. Earth and Planetary Science Letters 184:37–55. (Discovery)
Remarks: This mineral has yet to be synthesized and its stability field is unknown.
(Mg,Fe)5Si2O9 polymorphs
＊References＊
Bindi L., Sinmyo R., Bykova E., Ovsyannikov S. V., McCammon C., Kupenko I., Ismailova L., Dubrovinsky L., and Xie X. 2021. ACS Earth and Space Chemistry doi/10.1021/acsearthspacechem.1c00157. (Discovery)
CaSi2O5 polymorphs
Titanite-type CaSi2O5
Mineral name: unnamed
Discovery: Sao Liuz, Brazil (diamond inclusion)
＊References＊
Kanzaki M., Stebbins J. F., and Xue X. 1999. Geophysical Research Letters 18:463–466. (First synthesis)
Joswig W., Stachel T., Harris J. W., Baur W. H., and Brey G. P. 1999. Earth and Planetary Science Letters 173:1–6. (Discovery)