Fluoro-tremolite
Fluoro-tremolite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₂Mg₅Si₈O₂₂F₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Amphibole-amphiboles calcic structural group.
Key properties: Mohs hardness 5–6; specific gravity 3.044; Gray streak; Vitreous luster; optically biaxial.
IMA symbol Ftr, IMA status: approved, named in 2016.
A rock-forming mineral in skarn (Sparta, New Jersey).
It is found associated with Calcite, chondrodite, pyrrhotite.
The fluorine-analog of tremolite. The prefix fluoro indicates dominant fluorine in the W atomic site and the root name indicates the relation to tremolite.
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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