Kinoshitalite with Fredrickssonite (black) and Calcite (white) Locality: Långban, Filipstad, Värmland, Sweden Original description: dimension area mm. 2 x 2 — Photo: Luigi Chiappino · CC BY-SA 3.0
Kinoshitalite
Kinoshitalite is an IMA-recognized mineral species in the silicate class, with the chemical formula BaMg₃(Si₂Al₂O₁₀)(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Mica, Clay structural group.
Key properties: Mohs hardness 2.5–3; specific gravity 3.3; Vitreous luster; optically biaxial.
IMA symbol Kns, IMA status: approved, named in 1973.
Found in hausmannite-tephroite ore (Noda-Tamagawa mine, Japan); in manganese-rich rocks invaded by silicic pegmatite and carbonate veins (Netra, India).
It is found associated with Hausmannite, tephroite, celsian, quartz, spessartine, rhodonite, chalcopyrite, pyrrhotite, rhodochrosite, hÄ ubnerite, sonolite (Noda-Tamagawa mine, Japan).
The name refers to Dr. Kameki Kinoshita (1896–1974), investigator of ore deposits in Japan.