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Mineralpedia Details for Weloganite

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Weloganite

Weloganite

Named in honor of William Edmond Logan, the first Director of the Canadian Geological Survey as the type locality for this mineral is found at the Francon quarry in Montréal, Québec, Canada. Weloganite can be found only in Canada where it occurs with and in alkali intrusive rocks, and at a locality in South Africa. Weloganite is pyroelectric, meaning it generates a temporary charge when heated, and it also has a blue triboluminescence, or light that is generated when broken due to the breaking of the chemical bonds.

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

Formula
Na2Sr3Zr(CO3)6ยท3H2
Crystal System
Triclinic 
Crystal Habit
Pseudo Hexagonal, Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white, lemon yellow, amber, colorless 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Conchoidal 
Hardness
3.5 
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Weloganite from Francon quarry, Montreal, Quebec, Canada

Weloganite
            from Francon quarry, Montreal, Quebec, Canada

Excellent yellowish crystals to 3mm in stacked plates creating tornado like forms.

Excellent yellow crystals to 15mm resembling stacked plates associated with white balls of Dresserite.

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