Pellyite

pellyite

hedenbergite

sanbornite

taramellite

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Formula: Ba₂CaFe²⁺₂Si₆O₁₇
Unclassified silicate
Crystal System: Orthorhombic
Specific gravity: 3.51 measured, 3.48 calculated
Hardness: 6
Streak: White
Colour: Colourless to pale yellow
Solubility: Decomposes slowly in dilute hydrochloric acid, leaving a white residue Dana
Common impurities: Al,Mn,Zn
Environments

Metamorphic environments

Pellyite occurs in lenses and bands of barium silicate rocks developed in metamorphic skarn near the contact with granite or granodiorite. Associated minerals include baryte, hedenbergite, quartz, taramellite, gillespite, sanbornite, alforsite, witherite and andradite (HOM).

Localities

At the type locality, the Gun claim, Wilson Lake, Itsi Mountain, Watson Lake mining district, Yukon, Canada, pellyite occurs in a contact metasomatic deposit adjacent to a porphyritic quartz monzonite stock. It occurs as a massive crystalline constituent of skarns which have developed in original limestone bodies adjacent to the igneous contact. The average grain size of the pellyite is approximately 2 mm. The mineral assemblage includes pellyite, baryte, hedenbergite, quartz, andradite, taramellite, gillespite, sanbornite, chalcopyrite and witherite (CM 11.444-447).

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