Mineralpedia Details for 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
Beryllonite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada
Murky looking, white, rosettes or beads. Two of them on unknown matrix. Rare at MSH.
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.