Welshite
Welshite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₄[Mg₉Sb⁵⁺₃]O₄[Si₆Be₃AlFe³⁺₂O₃₆].
It crystallizes in the triclinic crystal system (space group P1). It is a member of the Sapphirine structural group.
Key properties: Mohs hardness 6; specific gravity 3.77; Pale brown streak; Subadamantine luster.
IMA symbol Wel, IMA status: approved, named in 1973.
Found in hematitic-dolomitic skarn.
It is found associated with Berzeliite, manganoan phlogopite, richterite, hausmannite, rom¶eite, adelite, swedenborgite.
The name refers to Wilfred R. Welsh, amateur mineralogist of Upper Saddle River, New Jersey, USA.
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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