Chirvinskyite
Chirvinskyite is an IMA-recognized mineral species in the silicate class, with the chemical formula (Na,Ca)₁₃(Fe,Mn, )₂Ti₂(Zr,Ti)₃(Si₂O₇)₄(OH,O,F)₁₂.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 5; specific gravity 3.07; White streak; Silky luster; optically biaxial.
IMA symbol Cvs, IMA status: approved, named in 2016.
Found in albitized alkaline pegmatites in a foyaite.
It is found associated with Natrolite, albite, fluorapatite, aegirine, parakeldyshite, lorenzenite, fluorcalciopyrochlore.
The mineral was named to honor Petr Nikolaevich Chirvinsky (1880-1955), Russian geologist and petrographer, head of the Petrography Department, Perm’ State University (1943-1953).
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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