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Formula: Ca3Al(CO3)[B(OH)4](OH)6.12H2O
Borate, ettringite group
Crystal System: Hexagonal
Specific gravity: 1.79 calculated
Hardness: 2 to 3
Streak: White
Colour: Colourless
Luminescence: No fluorescence under SW or LW UV
Environments
Metamorphic environments
Hydrothermal environments
Imayoshiite is a relatively new mineral, approved in 2013.
Localities
At the Shijiangshan mine, Hexigten Banner, Chifeng City, Inner Mongolia, China, imayoshiite has been found with
datolite and shinichengite
(Mindat photo).
Imayoshaite from the Shijiangshan Mine
- Image
At the type locality, Suisho-dani, Ise City, Mie Prefecture, Japan, imayoshiite occurs as aggregates of
fibrous to acicular crystals up to 2 mm across, in cavities in an altered
gabbro xenolith in
serpentinised
dunite, where rims of the xenoliths were hydrothermally altered.
Associated minerals include oyelite,
hydrogarnet, xonotlite,
tobermorite,
bultfonteinite,
apophyllite and prehnite
(HOM, Mindat).
Imayoshiite from Suisho-dani - Image
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