Ferriprehnite
Ferriprehnite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₂Fe³⁺(AlSi₃)O₁₀(OH)₂.
It crystallizes in the orthorhombic crystal system (space group Pma2). It is a member of the Prehnite structural group.
Key properties: Mohs hardness 6.5; specific gravity 2.97; White streak; Vitreous luster.
IMA symbol Fprh, IMA status: approved, named in 2020.
Found as a secondary mineral in druses developed in hydrothermally altered dolerite.
It is found associated with Prehnite, calcite, thomsonite-Ca, julgoldite.
The prefix indicates the Fe3+ analogue of prehnite.
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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