Paralstonite

paralstonite

barytocalcite

alstonite

olekminskite

Images

Formula: BaCa(CO3)2
Anhydrous normal carbonate, paramorph of alstonite and barytocalcite, forms a series with olekminskite
Specific gravity: 3.6
Hardness: 4 to 4½
Streak: White
Colour: Colourless, white
Solubility: Dissolves with effervescence in dilute hydrochloric acid
Common impurities: Sr
Environments


Hydrothermal 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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