from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral composed of a lead and copper vanadate.
from The Century Dictionary and Cyclopedia
- n. A hydrous vanadate of lead and copper occurring as a crystalline incrustation of a velvet-black color on sandstone at Mottram in Cheshire, England.
1875-80 Named after Mottram, England, where it was first identified (Wiktionary)