Fassaite

Fassaite
	Fassaite from Val di Fassa
General
Category	Mineral
Formula; (repeating unit)	Ca(Mg,Fe,Al)(Si,Al); 2O; 6
Crystal 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

Fassaite is a variety of augite with a very low iron content, Ca(Mg,Fe,Al)(Si,Al)
2O
6.^[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. https://pubs.geoscienceworld.org/msa/ammin/article-abstract/58/3-4_Part_1/230/542780. 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.). pp. 223. ISBN 3-405-14003-X.

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[1] 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. https://pubs.geoscienceworld.org/msa/ammin/article-abstract/58/3-4_Part_1/230/542780. Retrieved 30 December 2020.

[Mindat-2] Mindat

[3] 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