from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A steel-gray mineral, chiefly Bi2Te2S.
from The Century Dictionary.
- noun Native bismuth telluride, containing also some sulphur, a mineral occurring in foliated masses of a pale steel-gray color and brilliant metallic luster. Also called telluric bismuth, tellur - bismuth, and bornine.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A telluride of bismuth. It is of a pale steel-gray color and metallic luster, and usually occurs in foliated masses. Called also
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy a grey
mineralthat is mostly a mixed sulfideof bismuthand tellurium
from The American Heritage® Dictionary of the English Language, 4th Edition
[German Tetradymit, from Late Greek tetradumos, fourfold (from the double twin crystals in which it usually is found) : Greek tetra-, tetra- + didumos, double; see dwo- in Indo-European roots.]
It is also found in some comparatively rare minerals, such as tetradymite, combined with tellurium, and associated with gold.