Fassaite

Fassaite from Val di Fassa

General
Category| Mineral
Formula
(repeating unit)| Ca(Mg,Fe,Al)(Si,Al)

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| [1]

Fassaite is a variety of augite with a very low iron content, Ca(Mg,Fe,Al)(Si,Al)

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

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.
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

* Schumann, Walter (1991). Mineralien aus aller Welt. BLV Bestimmungsbuch (2 ed.). pp. 223. ISBN 3-405-14003-X.

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