Potassic-ferro-ferri-katophorite

A named amphibole that is NOT (yet) an approved mineral species

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Formula:

K(CaNa)(Fe²⁺₄Fe³⁺)(AlSi₇O₂₂)(OH)₂

Member of:

Katophorite Root Name Group > Sodium-Calcium Amphibole Subgroup > w(OH,F,Cl)-dominant Amphibole Group > Amphibole Supergroup

Currie and Van Breemen describe "large crystals,clots and spindles of amphibole" in the Red Pine Chute gneiss near the margins (normally less than 10m) of the syenite. They provide one EMPA analysis of the amphibole, with a composition near potassic-ferro-ferri-katophorite, using the rules established by Hawthorne et al. (2012)

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Unique IdentifiersHide

Mindat ID:

47036

Long-form identifier:

mindat:1:1:47036:6

IMA Classification of Potassic-ferro-ferri-katophoriteHide

IMA status notes:

Named Amphibole

Approval history:

Unnamed, but probably valid.

Classification of Potassic-ferro-ferri-katophoriteHide

Strunz-mindat (2026):

9.DE.20

9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si₄O₁₁; Clinoamphiboles

Chemistry of Potassic-ferro-ferri-katophoriteHide

Mindat Formula:

K(CaNa)(Fe²⁺₄Fe³⁺)(AlSi₇O₂₂)(OH)₂

Element Weights:

Element	% weight
O	38.748 %
Fe	28.177 %
Si	19.839 %
Ca	4.044 %
K	3.945 %
Al	2.723 %
Na	2.320 %
H	0.203 %

Calculated from ideal end-member formula.

Elements listed: