Katoite Locality: Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany Clear globular katoite on magnetite. Field of view 3 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Katoite
Katoite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₃Al₂(OH)₁₂.
It crystallizes in the cubic crystal system (space group Ia-3d). It is a member of the Garnet structural group.
Key properties: specific gravity 2.76.
IMA symbol Kto, IMA status: approved, named in 1982.
A hydrothermal mineral in cavities in a phonolitic lava flow that erupted through an argillaceous marl.
It is found associated with Tobermorite, afwillite, gehlenite, hydrocalumite, \opal, " portlandite, apophyllite, cordierite, jennite, strÄatlingite, chabazite, gismondine, phillipsite.
In honor of Akira Kato, mineralogist of the National Science Museum, Tokyo, Japan.