Biachellaite
Biachellaite is an IMA-recognized mineral species in the silicate class, with the chemical formula (Na,Ca,K)₈(Si₆Al₆O₂₄)(SO₄)₂(OH)₀.₅·H₂O.
It crystallizes in the hexagonal crystal system (space group P3). It is a member of the Cancrinite, Cancrinite-sodalite structural group.
Key properties: Mohs hardness 5; specific gravity 2.51; White streak; Vitreous luster; optically uniaxial.
IMA symbol Bcl, IMA status: approved, named in 2007.
Found in cavities in volcanic ejecta.
It is found associated with Sanidine, diopside, andradite, leucite, hauyne.
The name refers to the discovery locality, the Biachella Valley.
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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