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Mineralpedia Details for Mckelveyite-(Y)

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Mckelveyite-(Y)

Mckelveyite-(Y)

Formula
NaBa3(Ca,U)Y(CO3)6ยท3H2
Crystal System
Monoclinic 
Crystal Habit
Pyramidal 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, black, greenish gray, white, gray 
Streak
white 
Class
Monoclinic - Domatic 
Hardness
3.5-4 
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McKelveyite-(Y) from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

McKelveyite-(Y)
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

A single, 0.75mm, yellow flaky crystal.

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Mckelveyite-(Y) from Mont Saint-Hilaire, Montérégie, Québec, Canada

Mckelveyite-(Y)
            from Mont Saint-Hilaire, Montérégie, Québec, Canada

Interesting yellowish crystals forming saucer-like stacked groups to 1mm in Albite and Phlogopite matrix.

Click thumbnail images for larger view.

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