Inosilicate (chain silicate), amphibole group
Specific gravity: 3.091 calculated
Colour: Black,dark green-black, bluish black
Katophorite was defined as the katophorite group mineral with Fe and Al as the dominant elements in the C
position up until 1997. The katophorite group was redefined in 2012, renaming the Fe2+ and Al dominant
member of the group ferro-katophorite. The name katophorite is now used for the Mg and Al dominant member of the
group, which previously was named magnesiokatophorite
Katophorite occurs in alkalic volcanic and plutonic igneous rocks, and in blueschist facies jadeite rock. Associated minerals include arfvedsonite, aegirine, nepheline, eckermannite and chromite (HOM).
At the type locality, the Hpakant-Tawmaw Jade Tract, Hpakant Township, Mohnyin District, Kachin State, Myanmar, katophorite is found that is pleochroic in plane-polarised light, with X = pale blue (medium), Y = light blue-green (strongest) and Z = colourless (MM 79.2.355–363).
At the Shields River basin, Montana, USA, katophorite is found in basic alkaline igneous rocks forming rims on aegirine (Webmin).
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