Beryllite
Beryllite is an IMA-recognized mineral species in the silicate class, with the chemical formula Be₃(SiO₄)(OH)₂·H₂O.
Key properties: Mohs hardness 1; specific gravity 2.196; Silky luster; optically biaxial.
IMA symbol Byt, grandfathered status — known before the IMA’s founding, named in 1954.
Found in the center of a zoned pegmatite cutting arfvedsonite-bearing nepheline syenite (Lovozero massif, Russia); in analcime-rich veins (Il¶³maussaq intrusion, Greenland).
It is found associated with Albite, epididymite, bertrandite, natrolite, sodalite (Lovozero massif, Russia); analcime, s¿rensenite, chkalovite, epididymite.
In allusion to the BERYLLium in its composition.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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