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Formula: Ca(NO3)2.4H2O
Nitrate
Crystal System: Monoclinic
Specific gravity: 1.90 measured, 1.91 calculated
Hardness: 1 to 2
Streak: White
Colour: White, grey, colourless in transmitted light
Solubility: Readily soluble in water
Environments
Nitrocalcite occurs as efflorescences in limestone caves
where it is associated with niter and
nitromagnesite, and on alkaline soils, which may be seasonal.
(Mindat, HOM).
Localities
In Unnamed caves at Paddy's River Cu Mine, Cotter River, Australian Capital Territory, Australia, nitrocalcite
is associated with alunite,
aragonite, berlinite,
apatite variety collophane,
crandallite,
francoanellite, gypsum,
huntite, hydromagnesite,
leucophosphite,
nesquehonite and niter
(HOM).
The type locality is the Nicajack Cave, Marion county, Tennessee, USA.
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