Innsbruckite
Innsbruckite is an IMA-recognized mineral species in the silicate class, with the chemical formula Mn₃₃(Si₂O₅)₁₄(OH)₃₈.
It crystallizes in the monoclinic crystal system (space group Cm).
Key properties: Mohs hardness 6; specific gravity 3.216; optically biaxial.
IMA symbol Ibk, IMA status: approved, named in 2013.
Between serpentinite and chert, related to a late hydration stage after blueschist-facies metamorphism of former Mn-rich marine sediments.
It is found associated with Rhodochrosite, friedelite, tephroite, spessartine, calcite, apatite, barite.
The name refers to Innsbruck, Austria, a city near where the first specimens were collected.
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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