Mineralpedia Details for 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)₆·3H₂O 

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 

WebMineral

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Mindat

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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.