Hydrated acid arsenate
Specific gravity: 1.943
Hardness: 2 to 3
Colour: Colourless to white, faint tints; colourless in transmitted light
Solubility: Readily soluble in dilute hydrochloric acid, slightly soluble in water
Rösslerite is a mineral occurring with other arsenates in
the oxidised zone of arsenical ore deposits
associated with pharmacolite, haidingerite,
picropharmacolite and erythrite
At Jachymov, Bohemia, Czech Republic, rösslerite occurs with pharmacolite and haidingerite (Dana).
At the type locality, "Im Lochborn" Copper mine, Bieber, Gelnhausen, Main-Kinzig, Hesse, Germany, rösslerite is associated with pharmacolite and erythrite (Mindat, Dana).
Rösslerite dehydrates in air to form brassite (Mindat).
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