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Formula: Ca[B(OH)4]2
Anhydrous borate containing hydroxyl
Crystal System: Triclinic
Specific gravity: 2.14 to 2.22 measured, 2.259 calculated
Hardness: 3½
Streak: White
Colour: White, with a greyish tint
Luminescence: Luminesces violet in cathode rays (AM 43.385)
Environments
Metamorphic environments
Hydrothermal environments
Frolovite is a rare alteration product of hydrothermal boron minerals in
skarn deposits (HOM) in veinlets and irregular masses replacing
calciborite
(Dana).
Localities
At the Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan, frolovite is associated with
olshanskyite,
parasibirskite, sibirskite,
takedaite,
pentahydroborite,
nifontovite and calcite
(HOM).
At the type locality, the Novofrolovskoye B-Cu deposit, Tur'insk, Turya river, Turinsk-Auerbakovsk ore field, Serovsky
District, Sverdlovsk Oblast, Russia, frolovite occurs in
limestone in the
contact-metasomatic copper
deposits. It is associated with calciborite,
calcite, gypsum,
garnet and magnetite, and replaces
calciborite
(AM 43.385, HOM)
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