Black crystals of the rare silicate mineral ferri-katophorite (labeled as the varity magnesioferri-katophorite in the plastic box) in a white contrasting matrix. From Kipawa, Sheffield Lake, Les Lacs-du-Témiscamingue, Abitibi-Témiscamingue, Québec, Canada. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Ferri-katophorite
Ferri-katophorite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na(NaCa)(Mg₄Fe³⁺)(Si₇Al)O₂₂(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Amphibole structural group.
IMA symbol Fktp, IMA status: approved, named in 1978.
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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