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Yellow copperas (copiapite) is a yellow coloured secondary mineral of the copiapite group. A hydrous sulphate of iron it is formed through the oxidation of iron sulphide deposits and is associated with pyrite. Externally the crystals appear in tabular shapes, in plate-like aggregates of micro crystals, or in powdery encrustations on the surface of rocks and other minerals.
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Yellow ochre is a naturally occurring mix of limonite and clay.
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Yttro-cerite is a mineral of a violet-blue colour, inclining to grey and white. It is a hydrous fluoride of cerium, yttrium, and calcium.
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Yttro-Columbite is a tantalate of uranium, yttrium, and calcium, of a brown or black colour.
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Abbreviations
Rocks & Minerals
