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Formula: (K,Na)xMn2+6(Si,Al)10O24(OH)4.nH2O
(x=1-2; n=7-11)
Phyllosilicate (sheet silicate), ganophyllite group,
manganese-bearing mineral
Specific gravity: 2.84 to 2.88
Hardness: 4 to 4½
Streak: Brownish yellow
Colour: Brownish yellow, cinnamon-brown
Solubility: Gelatinises in acids
Common impurities: Fe,Zn,Pb,Ca,Ba
Environments:
Ganophyllite occurs in manganese-rich portions of metamorphosed zinc-manganese mineral deposits.
At Mont Saint-Hilaire, Quebec, Canada, ganophyllite occurs with astrophyllite and
labuntsovite
(Dana).
At the Molinello mine, Italy, ganophyllite is associated with parsettensite and
caryopilite
(HOM).
At Harstigen mine, Sweden, ganophyllite is associated with calcite,
rhodonite, caryopilite,
baryte,
lead, garnet,
manganoan biotite and pyrophanite
(HOM).
At Franklin, New Jersey, USA, ganophyllite is associated with rhodonite,
willemite, bustamite,
axinite, clinohedrite,
datolite, roeblingite and
charlesite
(HOM).
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