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Mineralpedia Details for Adamsite-(Y)

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Adamsite-(Y)

Adamsite-(Y)

Named for Professor Frank Dawson Adams of McGill University in Montreal, Canada, who was a geologist and petrologist who studied the Monteregian Hills, one of which is Mont Saint-Hilaire where the mineral finds its type locality at the Poudrette quarry. There are only two other localities for Adamisite-Y at Hundholmen in Nordland, Norway, and at the Shomiokitovoe pegmatite in the Lovozero massif on the Kola Peninsula in Russia. Adamsite-Y should not be confused by name with Adamsite, which is a variety of muscovite. Snow white fibrous crystals. A rare late-stage, low-temperature hydrothermal mineral in an alkalic pegmatite dike associated with an intrusive alkalic gabbro-syenite complex.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/adamsite-(Y).pdf

Formula
NaY(CO3)2ยท6H2
Crystal System
Triclinic 
Crystal Habit
Spherical, Radial, Aggregates 
Cleavage
Perfect, Good, Good 
Luster
Vitreous - Pearly 
Color
colorless, white, pale pink, pale purple 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
WebMineral
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Adamsite-(Y) from Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada

Adamsite-(Y)
            from Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada

Snow white fibrous crystals to 3mm.

Click thumbnail images for larger view.

Adamsite-(Y) from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Adamsite-(Y)
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada
Special Info
Type Locality

White prismatic crystals in a 4mm spray.

Click thumbnail images for larger view.

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