Zincostaurolite
Zincostaurolite is an IMA-recognized mineral species in the silicate class, with the chemical formula Zn₂Al₉Si₄O₂₃(OH).
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Staurolite structural group.
Key properties: Mohs hardness 7–7.5; specific gravity 3.78; White streak; Vitreous to resinous luster; optically biaxial.
IMA symbol Zst, IMA status: approved, named in 1992.
Found in metabauxite developed during regional metamorphism.
It is found associated with Kyanite, muscovite, margarite, chloritoid, gahnite, either quartz or diaspore.
The prefix, zinco, indicates the zincian analog of staurolite.
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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