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Mineralpedia Details for Beryllonite

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Beryllonite

Beryllonite

Named for the composition of mainly beryllium. Beryllonite is a rare mineral that occurs as a secondary mineral in granitic and alkalic pegmatites. Localities include in the United States, Canada, Finland, Sweden, England, Afghanistan, and Brazil among a few others. Associated minerals include herderite, triplite, beryl, apatite, cassiterite, columbite, eosphorite, morinite, vayrynenite, lithiophilite, Elbaite, pollucite, Petalite, lepidolite, albite, orthoclase, quartz.

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

Formula
NaBePO4 
Crystal System
Monoclinic 
Cleavage
Perfect, Good, Perfect 
Luster
Vitreous - Pearly 
Color
colorless, white, light yellow 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
5.5-6 
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Beryllonite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Beryllonite
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Murky looking, white, rosettes or beads. Two of them on unknown matrix. Rare at MSH.

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Beryllonite from Gilgit-Skardu Road, Northern Areas, Pakistan

Beryllonite
            from Gilgit-Skardu Road, Northern Areas, Pakistan

Large white to colorless crystal woth one end terminated and deep "striations" along the prism faces. The crystal is 4cm across the termination and 4cm along the prism side.

 

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