Beryllite

minerals

chkalovite

epididymite

tugtupite

Formula: Be3(SiO4)(OH)2.H2O
Nesosilicate (insular SiO4 groups), beryllium-bearing mineral
Specific gravity: 2.196
Hardness: 1
Streak: White
Colour: White
Common impurities: Ti,Al,Fe,Mg,Ca,Na
Environments

Pegmatites

Beryllite occurs in alkaline pegmatites associated with analcime, chkalovite, epididymite, sørensenite and tugtupite (Mindat).

Localities

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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