from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A tetragonal-ditetragonal dipyramidal mineral containing carbon, chlorine, lead, and oxygen.
from the GNU version of the Collaborative International Dictionary of English
- n. A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster. It is a chlorocarbonate of lead.
from The Century Dictionary and Cyclopedia
- n. A mineral consisting of the chlorid and carbonate of lead. It occurs in white or yellowish tetragonal crystals having an adamantine luster. Also called corneous lead.
Chemical analysis of cosmetics samples found in Egyptians tombs and the reconstitution of ancient recipes as reported by Greco-Roman authors have shown that two non-natural lead chlorides (laurionite Pb (OH) Cl and phosgenite Pb2Cl2CO3) were purposely synthesized and were used as fine powders in makeup and eye lotions.
They found the residue of a range of lead-based substances, including two lead chlorides: 'laurionite' (Pb (OH) Cl) and 'phosgenite' (Pb2Cl2CO2), which don't occur in nature.