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Webster 1913 Edition
Tetrahedrite
Tetˊra-he′drite
,Noun.
[So called because the crystals of the species are commonly
tetrahedrons
.] (Min.)
A sulphide of antimony and copper, with small quantities of other metals. It is a very common ore of copper, and some varieties yield a considerable presentage of silver. Called also
gray copper ore
, fahlore
, and panabase
.