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Formula: BaCa(CO3)2
Anhydrous normal carbonate, paramorph of
alstonite and barytocalcite,
forms a series with olekminskite
Crystal System: Trigonal
Specific gravity: 3.60 measured, 3.62 calculated
Hardness: 4 to 4½
Streak: White
Colour: Colourless, white
Solubility: Dissolves with effervescence in dilute hydrochloric acid
Common impurities: Sr
Environments
Paralstonite occurs in low-temperature hydrothermal
lead-zinc deposits (Webmin).
Localities
At the Kedrovyi alkaline massif, Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Russia,
paralstonite is associated with olekminskite,
calcite, baryte,
ankerite, ancylite-(Ce),
narsarsukite, sphalerite
and galena
(HOM).
At the type locality, the Minerva No. 1 Mine, Ozark-Mahoning group, Cave-In-Rock Mining Sub-District, Hardin County,
Illinois, USA, paralstonite occurs as coatings on baryte with yellow
calcite, grey alstonite, purple
fluorite and dark brown sphalerite
(AM 64.1332).
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