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Formula: Ca5BSi4O13(OH)3.4H2O
Phyllosilicate (sheet silicate), borosilicate
Crystal System: Triclinic
Specific gravity: 2.62 measured
Hardness: 5
Streak: White
Colour: White, pale tan
Common impurities: Al,Na,C
Environments
Metamorphic environments
Hydrothermal environments
Oyelite is a hydrothermal mineral in late-stage assemblages of several geological origins
(HOM).
Localities
At Suisho-dani, Ise City, Mie Prefecture, Japan, oyelite occurs in
rodingite embedded in
serpentinite
(HOM).
At the type locality, the Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan, oyelite occurs
in a vein cutting a spurrite zone of a
spurrite-gehlenite
skarn (Webmin). Associated minerals include
xonotlite, vesuvianite,
spurrite, scawtite,
quartz, hillebrandite,
gehlenite, garnet,
foshagite, calcite,
bultfonteinite and
bicchulite
(Mindat).
At the Bazhenovsk deposit, Asbest, Sverdlovsk Oblast, Russia, oyelite occurs in
rodingite formed by low-grade metamorphism of
gabbro dikes embedded in
serpentinites. Associated minerals include
tatarinovite, pectolite,
xonotlite, calcite,
grossular and diopside
(HOM).
At the N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape, South Africa,
exceptional specimens of oyelite occur in strata-bound manganese
ores in metamorphosed volcanogenic-sedimentary rocks. Associated minerals include
charlesite, bultfonteinite,
rhodochrosite and
hausmannite
(HOM).
At the Crestmore quarries, Crestmore, Riverside county, California, USA, oyelite occurs in
skarns
(HOM).
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