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Cobalt ochre
Erythrite (Sonora, Mexico)
General
Category	Mineral

Cobalt ochre, cobalt-ochre (Cobalt ocher in American English) or ochre of cobalt (German: Erdkobalt) — a common name that was widely used in mining and craft environments until the end of the 19th century for at least two cobalt-containing secondary ore minerals: asbolane and erythrite. They were often used with the addition of a clarifying color adjective or a clarifying mineral form adjective to avoid confusion.

For example, Robert Jameson divided cobalt ochres into four classes: black cobalt-ochres, brown cobalt-ochres, yellow cobalt-ochres and red cobalt-ochres. In turn, each of the color forms of ochre had two or three varieties. Black cobalt ochre had two main forms, which were widely distributed in the mines of Europe: earthy black cobalt-ochre and indurated black cobalt-ochre. Brown or yellow-brown cobalt-ochres varied in composition, sometimes being a mixture of black and yellow cobalt ochres. Yellow cobalt-ochres often appeared in association with various forms of red cobalt-ochres, as well as nickel ochres. Finally, red cobalt ochre was known in three mineral forms: earthy red cobalt-ochre, radiated red cobalt-ochre, and slaggy red cobalt-ochre.

References

1. Krivovichev V. G. Mineralogical glossary. Scientific editor A. G. Bulakh. — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. — 556 p. — ISBN 978-5-288-04863-0
2. ^ Robert Jameson. A System of Mineralogy. Vol.3: Class IV. Metallic Minerals. — Edinburgh, A. Constable & Co., 1816.
3. The Edinburgh Encyclopaedia, 1st American ed., Volume 13. J. and E. Parker edition, 1832.

• Set index articles
• Set index articles on minerals
• Cobalt minerals
• Mining terminology
• Mineral groups