Fine grained brown ferripyrophyllite from a little known locality: Tulagai, Akchatau, Karaganda Oblast, Kazakhstan. — Photo: David Hospital · CC BY-SA 4.0
Ferripyrophyllite
Ferripyrophyllite is an IMA-recognized mineral species in the silicate class, with the chemical formula Fe³⁺Si₂O₅(OH).
It crystallizes in the monoclinic crystal system. It is a member of the Clay, Pyrophyllite structural group.
Key properties: Mohs hardness 1.5–2; specific gravity 2.97–3.01; optically biaxial.
IMA symbol Fprl, IMA status: approved, named in 1978.
Found on museum specimens.
Presumably for its FERRIc iron content and relation to pyrophyllite.
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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