Specific gravity: 3.10
Colour: Colourless; colourless in transmitted light
Solubility: Readily soluble in warm hydrochloric or sulphuric acid
Melting Point = ~ 1340oC
Kotoite is an uncommon mineral typically formed in the contact zone of
magnesium-rich skarn borate deposits
At the Neichi mine, Japan, kotoite is associated with ludwigite, suanite, szaibélyite and warwickite (HOM).
At the type locality, the North orebody, Hol Kol Mine, Suan-gun, North Hwanghae Province, North Korea, kotoite is found in the contact metamorphic zone of a granitic intrusion into dolostone, associated with fosterite, norbergite, spinel, ludwigite, szaibélyite, fluoborite, clinohumite and dolomite (AM 24.406, HOM, Mindat).
Kotoite alters to szaibélyite under hydrothermal conditions (Dana).
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