Siderotil

minerals

sulphate

hydrothermal

melanterite

Formula: (Fe,Cu)(SO4).5H2O hydrated sulphate
Specific gravity: 2.1 to 2.2
Hardness: 2½
Streak: White
Colour: Yellowish, white, light green; colourless in transmitted light
Environments:

Hydrothermal environments

Siderotil is a rare supergene mineral formed by the oxidation of iron sulphides or the dehydration of cuprian melanterite. It tends to occur in association with other supergene sulphates such as jarosite. It can be a product of post-mining oxidation.

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