Formula: NaSb5+(OH)6
Hydroxide, stottite group
Specific gravity: 3.21
Hardness: 3
Streak: White
Colour: Colourless, white
Solubility: Soluble in hot, but not in cold, water. Decomposed by hydrochloric and nitric acid. Soluble in cold, dilute tartaric acid.

Hydrothermal environments

Mopungite is a secondary oxidation product of stibnite.

At the Cetine mine, Italy, mopungite is associated with cetineite, senarmontite, brizziite and other antimony oxides.

At the type locality, the Mopung Hills, Churchill county, Nevada, USA, mopungite occurs in quartz - fluorite - stibnite vein material associated with stibiconite, senarmontite, romeite and tripuhyite, all pseudomorphous after stibnite, and with selenium and sulphur.

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