Poudretteite

poudretteite

pectolite

apophyllite

aegirine

Images

Formula: KNa₂(B₃Si₁₂)O₃₀
Cyclosilicate (ring silicate), osumilite group
Crystal System: Hexagonal
Specific gravity: 2.51 measured, 2.53 calculated
Hardness: 5
Streak: White
Colour: Colourless, very pale pink
Environments

Plutonic igneous environments
Metamorphic environments

Localities

The type locality, the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, is an alkali gabbro-syenite complex. Poudretteite occurs in marble xenoliths within the nepheline syenite breccia, associated with pectolite and apophyllite, and with minor aegirine. Milarite was found in this assemblage as well, but not as a direct associate of poudretteite (CM 25.763-766).

At Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar, fine gem-quality crystals of poudretteite have been found (R&M 94.4.376-378).

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