General Information:
Chemical Formula:
(K,Na)(Fe++,Mn++,Mg)2.5[Si4O10](F,OH)2
Environment:
Small grains in perialkaline rhyolite.
Locality:
Mt. Dore stratovolcano, near La Bourboule, France.
Name Origin:
Famed for the locality.
Physical Properties:
Color:
green or brownish green.
Diaphaniety:
Translucent
Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
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