Caryopilite

caryopilite

gonyerite

brandtite

jacobsite

Images

Formula: Mn2+3Si2O5(OH)4
Phyllosilicate (sheet silicate), kaolinite-serpentine group
Specific gravity: 2.87
Hardness: 3 to 3½
Streak: Light brown
Colour: Brown, reddish-brown, tan
Solubility: Readily soluble in concentrated acids
Common impurities: Al,As,Fe,Zn,Ca,F,Cl
Environments

Sedimentary environments
Metamorphic environments
Hydrothermal environments

Caryopilite forms as an alteration product of primary manganese silicates such as rhodonite (Webmin, Dana, HOM). It also occurs in metamorphosed manganese deposits and as granules in sediments (Dana).

Localities

At Langban, Sweden, caryopilite is asociated with gonyerite (HOM, AM 65.335-339).

At the type locality, the Harstigen Mine, Pajsberg, Persberg ore district, Filipstad, Värmland County, Sweden, caryopilite is associated with sarkinite, calcite, rhodonite, lead and brandtite (Mindat, HOM). It occurs with calcite as a replacement of rhodonite crystals (AM 65.335-339).

At Bald Knob, North Carolina, USA, caryopilite is associated with manganoan calcite, rhodonite and jacobsite (HOM). The Bald Knob material occurs in a thin, discontinuous consisting of manganoan calcite, rhodonite, jacobsite and caryopilite, cutting across gneiss (AM 65.335-339).

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