Carraraite
Carraraite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Ca₃Ge(SO₄)(CO₃)(OH)₆·12H₂O.
It crystallizes in the hexagonal crystal system (space group P6_3/m). It is a member of the Ettringite structural group.
Key properties: Mohs hardness 2.5; specific gravity 1.979; Vitreous luster; optically uniaxial.
IMA symbol Cra, IMA status: approved, named in 1998.
A rare secondary mineral formed by late-stage hydrothermal alteration of earlier sulfides and sulfosalts.
It is found associated with Nordstrandite, dawsonite.
The name refers to its occurrence in the Carrara district, Italy.
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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