from the GNU version of the Collaborative International Dictionary of English
- n. A mineral of pale steel-gray color and metallic luster, occurring in isometric crystals, and also massive. It is a sulphide of cobalt containing some nickel or copper.
from The Century Dictionary and Cyclopedia
- n. A native sulphid of cobalt, of a tin-white color, crystallizing in octahedral crystals, also occurring massive. Siegenite is a nickeliferous variety.
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