Ferrochiavennite
Ferrochiavennite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₁₋₂Fe[(Si,Al,Be)₅Be₂O₁₃(OH)₂]·2H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 3; specific gravity 2.67; White streak; Vitreous luster; optically biaxial.
IMA symbol Fcve, IMA status: approved, named in 2012.
A late hydrothermal stage mineral in alkaline syenite pegmatite.
It is found associated with Albite, magnetite, fayalite, with minor amounts of zircon, nepheline, analcime, pyrite, hambergite (Blåfjell); tvedalite, apophyllite-(KF), natrolite.
As the iron (ferro) analog of chiavennite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more F minerals or help write this entry.