Tennantite is a copper arsenic sulfosalt mineral with an ideal formula Cu12As4S13. Due to variable substitution of the copper by iron and zinc the formula is Cu6[Cu4(Fe,Zn)2]As4S13. It is gray-black, steel-gray, iron-gray or black in color. A closely related mineral, tetrahedrite (Cu12Sb4S13) has antimony substituting for arsenic and the two form ...
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http://en.wikipedia.org/wiki/Tennantite
• (n.) A blackish lead-gray mineral, closely related to tetrahedrite. It is essentially a sulphide of arsenic and copper.
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http://thinkexist.com/dictionary/meaning/tennantite/
(from the article `tetrahedrite`) ...ore of copper and sometimes of silver. It forms gray to black metallic crystals or masses in metalliferous hydrothermal veins. Tetrahedrite forms ...
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http://www.britannica.com/eb/a-z/t/25
Ten'nant·ite noun [ Named after Smithson
Tennant , an English chemist.]
(Min.) A blackish lead- gray mineral, closely related to tetrahedrite. It is essentially a sulphide of arsenic and copper.
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http://www.encyclo.co.uk/webster/T/26
Tennantite, named after Smithson Tennant, an English chemist is a blackish lead-grey mineral, closely related to tetrahedrite. It is essentially a sulphide of arsenic and copper.
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http://www.probertencyclopaedia.com/browse/HT.HTM
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