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From Wikipedia, the free encyclopedia
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.
Fassaite | |
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![]() Fassaite from Val di Fassa | |
General | |
Category | Mineral |
Formula (repeating unit) | Ca(Mg,Fe,Al)(Si,Al)2O6 |
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] |
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]