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Katoite
A valid IMA mineral species
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Colour:
Colourless
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
3.013 (Calculated)
Crystal System:
Isometric
Member of:
Name:
Named in 1984 by E. Passaglia and R. Rinaldi in honor of Akira Kato (加藤 昭) (b. 19 June 1931, Tokyo prefecture, Japan), Department of Geology, National Science Museum, Ueno, Tokyo, Japan. Former president of the International Mineralogical Association. In addition to his academic positions, Dr Kato was the founder of one of the most active Tokyo clubs for mineral collectors and amateur mineralogists and he was always willing to help amateurs with their studies.
Grossular-Katoite Series. Compare also the tetragonal-pseudocubicHoltstamite.
Ungrouped member of theGarnet Supergroup.
For x = 3, i.e. the end member, the species is also known as C3AH6 ("Tricalcium aluminate hydrate") in hydrated cement.
See alsohydrogarnet.
Note that the "hydrogarnet" exchange is not limited to only grossular-rich garnets, and has also been observed involving andradite ("hydro-andradite") and sometimes uvarovite ("hydro-uvarovite") as well. A related exchange, where Si is also replaced by vacancies but the local charge balance is instead maintained by replacing the four adjacent oxygen by fluorine, is particularly notable in some igneous spessartine-rich garnets ("fluor-spessartine"), but occurs in other garnet varieties as well; mixed exchanges (e.g. "fluor-hydro-andradite") are also known.
Katoite from Tadano bears both hexa- and tetravalentsulfur (Banno et al., 2023).
Ungrouped member of theGarnet Supergroup.
For x = 3, i.e. the end member, the species is also known as C3AH6 ("Tricalcium aluminate hydrate") in hydrated cement.
See alsohydrogarnet.
Note that the "hydrogarnet" exchange is not limited to only grossular-rich garnets, and has also been observed involving andradite ("hydro-andradite") and sometimes uvarovite ("hydro-uvarovite") as well. A related exchange, where Si is also replaced by vacancies but the local charge balance is instead maintained by replacing the four adjacent oxygen by fluorine, is particularly notable in some igneous spessartine-rich garnets ("fluor-spessartine"), but occurs in other garnet varieties as well; mixed exchanges (e.g. "fluor-hydro-andradite") are also known.
Katoite from Tadano bears both hexa- and tetravalentsulfur (Banno et al., 2023).