from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A rare lead chromate mineral, PbCrO4, that forms brilliant orange crystals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A rare red mineral; lead chromate, PbCrO4.
from the GNU version of the Collaborative International Dictionary of English
- n. Lead chromate occuring in crystals of a bright hyacinth red color; -- called also red lead ore.
from The Century Dictionary and Cyclopedia
- n. A mineral, a native chromate of lead or red-lead ore, found in brilliant red crystals in the Urals and Brazil, and also massive.
Chromium is a metallic element found in nature in the form of chromite ore or the mineral crocoite.
This mineral, crocoite (PbCrO4, lead chromate), was known as “red lead” because of the beautiful orange-red color of its crystals.
Chromium produces the color orange-red color of crocoite, (lead chromate).