Formula: Ba2Ca(Fe,Mg)2Si6O17
Origin of name: after locality Pelly River, Yukon Territory, Canada
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless to pale yellow
Diaphaneity: translucent
Luster: vitreous
Habit: massive, crystalline, grains average 2 mm
Hardness: 6
Specific gravity: 3.51
Cleavage: 1; prismatic, poor
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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