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Formula: MgAl2Si2O6(OH)4
Inosilicate (chain silicate), carpholite group, forms a series with
ferrocarpholite
Crystal System: Orthorhombic
Specific gravity: 2.88 calculated
Hardness: 5 to 5½
Streak: White
Colour: Grey-green, white
Common impurities: Ti,Fe,Mn,Ca,Na,K,H2O,P
Environments
Magnesiocarpholite is a high pressure, low temperature mineral occurring in
blueschist facies metamorphic rocks
(Webmin). Associated minerals include chloritoid,
pyrophyllite, paragonite,
muscovite, diaspore,
chlorite, hematite and
quartz
(HOM).
Localities
At the type locality, Vanoise, Savoie, Auvergne-Rhône-Alpes, France, magnesiocarpholite occurs in veins and in
schist, quartzite and
metamorphosed bauxite formed during high pressure, low temperature
metamorphism
(HOM).
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