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Formula: SiO2.n (CH4 ,C2H6 ,C3H8 ,C4H10) (n max = 3/17)
Tectosilicate (framework silicate)
Crystal System: Isometric
Specific gravity: 1.933 calculated
Hardness: 6½ to 7
Colour: Colourless
Environments
Sedimentary environments
Hydrothermal environments
Chibaite is a relatively new mineral, approved in 2009 and to date (June 2023) reported only from the type
locality
Localities
At the type locality, Arakawa, Minamiboso city, Chiba Prefecture, Japan, chibaite occurs as veins cutting
tuffaceous sandstone
and mudstone in sediments deposited near a plate margin.
Associated minerals include calcite,
quartz,
opal, pyrite,
epistilbite and
clinoptilolite
(HOM).
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