Kannanite
Kannanite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₄Al₄(MgAl)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆.
It crystallizes in the orthorhombic crystal system (space group Pnmm). It is a member of the Ardennite structural group.
Key properties: Mohs hardness 6; specific gravity 3.43; Vitreous luster.
IMA symbol Kna, IMA status: approved, named in 2015.
A product of pumpellyite-actinolite-facies metamorphism of Fe-Mn-ore (quartz, hematite, braunite) in metachert.
It is found associated with Ardennite-(V), piemontite, hematite, quartz.
The name is derived from the locality that produced the first specimen, Kannan Mountain, Japan.
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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