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Formula: CaB2O2(OH)4
Anhydrous tetraborate, paramorph
of vimsite
Crystal System: Monoclinic
Specific gravity: 2.58 - 2.60 measured, 2.58 calculated
Hardness: 4 to 4½
Colour: Colourless
Luminescence: Fluoresces violet under long wave UV.
Solubility: Soluble slowly in 10% hydrochloric acid at room temperature, insoluble in dilute acetic acid
Environments
Sedimentary environments
Metamorphic environments
Localities
At the Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan, uralborite occurs in a vein
cutting limestone, associated with
sibirskite, borcarite,
fluorite and calcite
(HOM).
Uralborite from Fuka - Image
At the type locality, the Novofrolovskoye B-Cu deposit, Tur'insk, Turya river, Serovsky District, Sverdlovsk Oblast,
Russia, uralborite occurs as a rare secondary mineral
in boron-rich iron-ore skarn.
Associated minerals include
andradite–grossular,
magnetite, szaibelyite and
frolovite
(HOM).
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