Tvrdýite
Tvrdýite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Fe²⁺Fe³⁺₂Al₃(PO₄)₄(OH)₅(H₂O)₄·2H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Beraunite structural group.
IMA symbol Tvr, IMA status: approved, named in 2014.
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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