Lead ochre

Lead ochre
Lead ochre
General
Category	Mineral

Lead ochre or lead ocher in American English (German: bleiocker; from Ancient Greek ὤχρα ōkhrós 'pale yellow, orange'), as well as plumbic ocher or lead oxide^[1]^: 209 — at least three lead minerals (pigments)^[2]^{: 307, 495} 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]^: 184 — β-PbO,^[4]^{: 393 (Lead ocher)} 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]^: 548 — α-PbO,^[4]^: 393 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]^: 307 also known as red lead or red lead oxide, is a bright orange red pigment;

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^ 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.
^ ^a ^b 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
^ Thomas Egleston, Ph. D. Catalogue of Minerals and Synonyms. — Washington: Government Printing Office, 1887.
^ ^a ^b Albert Hill Fay. A Glossary of the Mining and Mineral Industry. — U.S. Government Printing Office, 1920. — 754 p.
^ Henry Watts A dictionary of chemistry and the allied branches of other sciences. — London, Longmans 1870.

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