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Formula: Ca(CHOO)2
Valence: Ca(HCOO)1-2
Organic compound
Crystal System: Tetragonal
Specific gravity: 1.9 measured, 1.93 calculated
Hardness: 1
Streak: White
Colour: White with a bluish tint
Luminescence: Some specimens have a weak, light bluish luminescence under short wave UV
Environments
Metamorphic environments
Hydrothermal environments
Localities
At the type locality, the Solongo B deposit, Ozernoe ore cluster, Yeravninsky District, Buryatia, Russia, forrmicaite
occurs in hydrothermal veinlets that cut kurchatovite -
sakhaite ore. Associated minerals are calcite,
lizardite, frolovite,
pentahydroborite,
hexahydroborite and vimsite
(AM 85.1321-1322.
The formicaite occurs as compact cryptocrystalline and colloform masses, and as aggregates in which the crystals are
tabular and up to 5 × 30 × 30 µm3 in size
(Mindat).
Formicaite from the Solongo B deposit - Image
At the Novofrolovskoye B-Cu deposit, Tur'insk, Turya river, Serovsky District, Sverdlovsk Oblast, Russia, formicaite occurs
in a veinlet in skarnitised marble.
Associated minerals include calcite,
vesuvianite, pentahydroborite,
frolovite, calciborite,
uralborite and johnbaumite
(HOM).
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