Fassaite is a variety of
augite with a very low iron content, .
[Mindat]
/ref> It is named after the Fassa Valley, Italy
Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...
.
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.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
/ref>
References
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Inosilicates
Monoclinic minerals
Minerals in space group 15
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