Boralsilite
Boralsilite is an IMA-recognized mineral species in the silicate class, with the chemical formula Al₁₆B₆O₃₀(Si₂O₇).
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: specific gravity 3.07; White streak; Vitreous luster; optically biaxial.
IMA symbol Bor, IMA status: approved, named in 1996.
A high-temperature phase in pegmatites cutting granulite-facies metapelitic rocks.
It is found associated with Quartz, potassium feldspar, schorl/dravite (Larsemann Hills); potassium feldspar, plagioclase(An22), werdingite, dumortierite, grandidierite (Almgjotheii).
The name comes from the composition, boron, aluminum, and silicon.
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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