Barroisite
Barroisite is an IMA-recognized mineral species in the silicate class, with the chemical formula (NaCa)(Mg₃Al₂)(Si₇Al)O₂₂(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Amphibole structural group.
Key properties: Mohs hardness 5–6; specific gravity 3.21; [Vitreous.] luster.
IMA symbol Brs, IMA status: approved, named in 1922.
Found in blueschist facies metamorphic rocks.
It is found associated with Omphacite, glaucophane, crossite, actinolite, calcite.
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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