Cyanotrichite in its host rock

Cyanotrichite in its host rock

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Cyanotrichite in its host rock. Cyanotrichite is a copper aluminium sulphate mineral. It is also known as lettsomite and very similar to halotrichite, but rarer. It forms velvety bright blue aggregates of very fine fibres and radial-acicular crystal clusters, which form as an oxidation product upon weathering of copper deposits in the presence of both aluminium and sulphate compounds. This sample is from Arizona, USA, and measures 60 mm wide.

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Keywords: aggregate, aggregates, arizona, blue, chemical, chemistry, close-up, copper, copper aluminium sulphate, crystal, crystalline, crystallised, crystals, detail, earth science, geographical, geography, geological, geology, host rock, mineral, mineralogy, nature, north american, sample, specimen, still life, still-life, usa

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