Nesosilicate (insular SiO4 groups), beryllium-bearing mineral
Specific gravity: 2.196
Common impurities: Ti,Al,Fe,Mg,Ca,Na
Beryllite occurs in alkaline pegmatites associated with analcime,
sørensenite and tugtupite
At the Ilímaussaq complex, Kujalleq, Greenland, beryllite occurs in analcime-rich veins, associated with analcime, sørensenite, chkalovite, epididymite and tugtupite (HOM).
At the type locality, Natrolite Stock, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, beryllite occurs in the centre of a zoned pegmatite cutting arfvedsonite-bearing nepheline syenite. The border zone consists mainly of aegirine and arfvedsonite; these decrease in amount towards the centre and microcline and natrolite increase. The centre zone consists mainly of natrolite with relicts of very coarse sodalite variety hackmannite and with fine-grained albite. Beryllite occurs rarely in cavities and coating albite and epididymite (AM 40.787, HOM, Mindat). Associated minerals include albite, epididymite, bertrandite, natrolite and sodalite (HOM).
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