Dmitryivanovite

Dmitryivanovite
General
Category	Oxide mineral
Formula (repeating unit)	CaAl2O4
Strunz classification	4.BC.10
Crystal system	Monoclinic
Crystal class	Prismatic (2/m)
Space group	Monoclinic H-M symbol: (2/m) Space group: P21/c
Unit cell	a = 7.95, b = 8.62 c = 10.25 [Å]; β = 93.1°; Z = 12
Identification
Color	Colorless
Crystal habit	Phase in CAI of 470 (NWA470) CH3 chondrite as subhedral grains
References	[1][2]

Dmitryivanovite is a natural mineral composed of calcium, aluminium and oxygen, with the molecular formula CaAl₂O₄. It was reported in 2009^[3] in a calcium-aluminium-rich inclusion in the carbonaceous chondrite meteorite 470 (NWA470) CH3, which landed in North Africa. The mineral name was chosen to^[4] honor Dmitriy A. Ivanov (1962–1986), a geologist, mineralogist, and petrologist who died on a field expedition.^[3][5][6]

It is the high-pressure CaAl₂O₄ dimorph of krotite.

See also

• Glossary of meteoritics

References

1. Webmineral data
2. Mindat.org
3. Mikouchi, T.; Zolensky, M.; Ivanova, M.; Tachikawa, O.; Komatsu, M.; Le, L.; Gounelle, M. (2009). "Dmitryivanovite: A new high-pressure calcium aluminum oxide from the Northwest Africa 470 CH3 chondrite characterized using electron backscatter diffraction analysis". American Mineralogist. 94 (5–6): 746–750. doi:10.2138/am.2009.3080.
4. "New minerals approved by the IMA-CNMNC in September 2010" (PDF).
5. Zolensky, M; Mikouchi, T (2010). "Structures of Extraterrestrial Minerals Revealed by EBSD". Microscopy and Microanalysis. 16: 676–677. Bibcode:2010MiMic..16..676Z. doi:10.1017/S1431927610056060.
6. Dougill, Maryon W. (1957). "Crystal Structure of Calcium Monoaluminate". Nature. 180 (4580): 292–293. Bibcode:1957Natur.180..292D. doi:10.1038/180292a0.