Potassic-fluoro-richterite

potassic-fluoro-richterite

calcite

diopside

Mount Somma

Images

Formula: K(NaCa)Mg₅Si₈O₂₂F₂
Inosilicate, richterite root name group, amphibole
Crystal System: Monoclinic
Specific gravity: 3.06 measured, 3.03 calculated
Hardness: 5 to 6
Streak: White
Colour: Brown to brownish red, rose-red, yellow, grey-brown, also pale to dark green
Luminescence:
Solubility:
Common impurities:
Environments

Volcanic igneous environments

Localities

At the type locality, the San Vito Quarry, San Vito, Ercolano, Mount Somma, Somma-Vesuvius Complex, Naples, Campania, Italy, potassic-fluoro-richterite occurs as light grey, euhedral, prismatic crystals up to 0.5 cm long, and as thin veinlets. It is transparent, with a vitreous lustre and a white streak. It occurs in a skarn ejectum occurring in pyroclasts and associated with calcite and diopside (AM 79.186).

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