Formula :
(K,Na,Ca)2(Mn2+,Al,Mg)8[(OH)7/((Si,Al)4O10)3] * 8 H2O
System: monoclinic Hardness:4-4½ Rarity:rare
Strunz id:VIII/H.17-60 -
SILICATES
Name origin: Named in 1890 by Axel Hamberg from the Greek γανωμα for "brilliance or luster" and φύλλον for "leaf," in allusion to the high luster on platy cleavage surfaces.
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