Formula: SiO2.n (CH4 ,C2H6 ,C3H8 ,C4H10) (n max = 3/17)
Tectosilicate (framework silicate)
Specific gravity: 1.933
Hardness: 6½ to 7
Chibaite is a relatively new mineral, approved in 2009 and to date (June 2022) reported only from the type
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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