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Prismatine

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RMM105530

Prismatine

Description Tabs

Description
Locality: 
Hincks Bridge, Lac-Sainte-Maire, Outaouais, Québec, Canada
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 3 × 3 cm
Largest Crystal: 
2.00cm
Description

Greenish-grey prismatic prismatine in a matrix of quartz with some biotite, garnet, sillimanite, and pyrite.
Prismatine crystals measure up to 2.0 cm in length and up to 2.0 mm in diameter and constitute about 30% of the piece. The specimen weighs about 120 grams.

Mineral Data
What's on the rock

Prismatine

Formula: 
([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
Strunz: 
9.BJ.50
Crystal System: 
Orthorhombic
Hardness: 
6.5 - 7.0
Type Locality: 
Granulite outcrop, Waldheim, Döbeln, Saxony, Germany

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