from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A green, brown, or yellow mineral, Pb5(PO4)3Cl, a minor ore of lead.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A yellowish-green mineral, a mixed phosphate and chloride of lead with the chemical formula Pb5(PO4)3Cl, that is sometimes mined as an ore.
from the GNU version of the Collaborative International Dictionary of English
- n. Native lead phosphate with lead chloride, occurring in bright green and brown hexagonal crystals and also massive; -- so called because a fused globule crystallizes in cooling.
from The Century Dictionary and Cyclopedia
- n. Native phosphate of lead with lead chlorid.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a mineral consisting of lead chloride and phosphate; a minor source of lead
For the assay of pyromorphite the following charge may be used: -- Ore, 20 grams; "soda," 25 grams; tartar, 7 grams; and fluor spar,
Where lead is present as phosphate (as in the case of pyromorphite), or mixed with phosphates (as sometimes happens), carbonate of soda is a suitable flux; but the phosphate of soda which is formed makes a thick tenacious slag, which is very apt to be carried out of the pot by the escaping gas.
Apatite (phosphate of lime) and pyromorphite (phosphate of lead) contain a considerable amount of it.
The lead in the soil, deposited by car exhaust from the decades when gasoline contained lead or from lead-based paint residue, binds with the phosphate and transforms into pyromorphite, a crystalline mineral that will not harm anyone even if consumed.
(cerussite), sulphate (anglesite), and phosphate (pyromorphite) of lead also occur as ores, but in much smaller quantities.