from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A white crystalline platinum mineral, essentially PtAs2.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An isometric-diploidal tin white mineral containing arsenic and platinum.
from the GNU version of the Collaborative International Dictionary of English
- n. An arsenide of platinum occuring in grains and minute isometric crystals of tin-white color. It is found near Sudbury, Ontario Canada, and is the only known compound of platinum occuring in nature.
from The Century Dictionary and Cyclopedia
- n. A native arsenide of platinum, occurring in minute isometric crystals with pyrite and chalcopyrite at the Vermilion mine, near Sudbury in Ontario.
After Francis Louis Sperry (died 1906), Canadian chemist.(American Heritage® Dictionary of the English Language, Fourth Edition)