Sacrofanite
A variety of Minerals
What is Sacrofanite?
Sacrofanite is a rare silicate mineral that has the general formula of (Na,Ca)9(Si,Al)12O24(SO4,CO3,OH,Cl)4·n(H2O). It was approved as a mineral by the International Mineralogical Association in 1980. Its name comes from the Sacrofano Caldera in the Monti Sabatini from which it was discovered in Latium, Italy.
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Key Characteristics
Formation of Sacrofanite
Sacrofanite is only found in the Sacrofano Caldera in Italy, yet it represents one of many new minerals found in Italian volcanoes. It can be found on display in The Mineralogical Museum at the University of Rome. It occurs as a crystal coating within a vug in a rock ejected from the volcano. Other minerals occurring in the rock include sanidine, andradite, fassaite, leucite and hauyne.
Quick Facts
Physical Properties
- Color
- colourless
- Hardness (Mohs)
- 5.5 - 6
- Streak
- white
Chemical Properties
- Chemical Formula
- (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2O
- Elements
- Al, Ca, Cl, F, H, K, Na, O, S, Si

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