Ferro-ferri-katophorite

ferro-ferri-katophorite

aegirine

augite

amphibole

Images

Formula: Na(NaCa)(Fe²⁺₄Fe³⁺)(Si₇Al)O₂₂(OH)₂
Inosilicate (chain silicate), amphibole group
Crystal System: Monoclinic
Specific gravity: 3.32 measured, 3.358 calculated
Hardness: 6
Streak: Pale greyish green
Colour: Black
Luminescence: No fluorescence under UV
Environments

Carbonatites

Localities

At the type locality, the Eastern flank of the Sierra de Maz, Villa Unión, Coronel Felipe Varela department, La Rioja Province, Argentina, ferro-ferri-katophorite was found as xenocrysts up to 3 cm long and replacement rims around aegirine–augite in silicocarbonatite dykes cropping out. Ferro-ferri-katophorite is black and has vitreous lustre and a pale green streak (MM 87.2.324-330).

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