Lead ochre explained

Lead ochre or lead ocher in American English (German: bleiocker;), as well as plumbic ocher or lead oxide^[1] — at least three lead minerals (pigments)^[2] that resemble ocher in appearance. Under such a trivial name, minerals and pigments of cream, yellow, orange and red colors were known, reminiscent of or corresponding to the powdery consistency of ochre. The term ″lead ochre″ was used primarily among glassblowers, artisans, as well as geologists and miners. It may refer to:

• Lead ochre or massicot^[3] — β-PbO,^[4] massicot, stable at temperatures above 489°C, metastable at room temperature, yellow crystals, is a secondary mineral which forms from the oxidation of galena ores, is a bright yellow pigment;
• Lead ochre or litharge^[5] — α-PbO,^[4] lead litharge, stable up to a temperature of 489°C, red crystals, is a secondary mineral which forms from the oxidation of galena ores, is a bright orange pigment;
• Lead ochre or minium — Pb₂PbO₄,^[2] also known as red lead or red lead oxide, is a bright orange red pigment;

See also

• Ochre
• Ochre (disambiguation)
• Lead (disambiguation)
• Lead(II) oxide
• List of inorganic pigments
• List of colors
• Red pigments
• Orange
• Yellow

Notes and References

1. Edward Salisbury Dana. A text-book of Mineralogy with an extended treatise on Crystallography and physical mineralogy. Third Edition, revised and enlarged by William E. Ford. — London: Chapman & Hall, Limited, 1922. — 754 p.
2. 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
3. Thomas Egleston, Ph. D. Catalogue of Minerals and Synonyms. — Washington: Government Printing Office, 1887.
4. Albert Hill Fay. A Glossary of the Mining and Mineral Industry. — U.S. Government Printing Office, 1920. — 754 p.
5. Henry Watts A dictionary of chemistry and the allied branches of other sciences. — London, Longmans 1870.