Fassaite
Ca(Mg,Fe,Al)(Si,Al)2O6Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group C2/c (no. 15) Identification Color light-dark green, black Crystal habit prismatic, short, plane Mohs scale hardness 6 Streak greenish-white Specific gravity 2.9-3.3 References [1]
(same H-M symbol)
Fassaite is a variety of augite with a very low iron content, Ca(Mg,Fe,Al)(Si,Al)2O6.[2] It is named after the Fassa Valley, Italy.
It is thought to be a contact mineral formed at high temperature on the interface between volcanic rocks and limestone. It is also reported in meteorites.[3]
References
- ^ Dowty, E.; Clark, J.R. (1973). "Crystal structure refinement and optical properties of a Ti3+ fassaite from the Allende Meteorite". American Mineralogist. 58: 230–242. Bibcode:1973AmMin..58..230D. Retrieved 30 December 2020.
- ^ Mindat
- ^ Simon, S. B. and L. Grossman, A comparative study of melilite and fassaite in Types B1 and B2 refractory inclusions, Geochimica et Cosmochimica Acta 70 (2006) 780–798
- Schumann, Walter (1991). Mineralien aus aller Welt. BLV Bestimmungsbuch (2 ed.). p. 223. ISBN 3-405-14003-X.
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