Discussion
Glaucophane is a :
Answer: D
Glaucophane is an alkali amphibole.
Glaucophane, Na2(Mg,Fe)3Al2Si8O22(OH)2, is a sodic amphibole, with sodium filling the B site. It is the characteristic blue mineral of blueschists, formed at high pressure and low temperature in subduction zones.
Calcic amphiboles such as hornblende and tremolite have calcium in that site, and magnesium (Mg-Fe) amphiboles such as anthophyllite and cummingtonite have magnesium and iron. White mica is a sheet silicate, not an amphibole.
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