Nabesite
A rare beryllium-bearing zeolite forming colorless mica-like platy sheets.
Intro adapted from Wikipedia (CC BY-SA).
Nabesite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₂BeSi₄O₁₀·4H₂O.
It crystallizes in the orthorhombic crystal system (space group P2_12_12_1).
Key properties: Mohs hardness 5–6; specific gravity 2.16; White streak; Vitreous luster; optically biaxial.
IMA symbol Nbs, IMA status: approved, named in 2000.
Found in albite-lined cavities within tugtupite-bearing albitites.
It is found associated with Gmelinite, neptunite, analcime, gonnardite, lovdarite.
Comprised of the chemical symbols of the mineral’s three essential cations - Na, Be, Si.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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