1) Cubic mineral
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https://www.crosswordclues.com/clue/tetrahedrite
Tetrahedrite is a copper antimony sulfosalt mineral with formula: {Chem|(Cu,Fe)|12|Sb|4|S|13}. It is the antimony endmember of the continuous solid solution series with arsenic-bearing tennantite. Pure endmembers of the series are seldom if ever seen in nature. Of the two, the antimony rich phase is more common. Other elements also substitute in t...
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http://en.wikipedia.org/wiki/Tetrahedrite
• (n.) 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.
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http://thinkexist.com/dictionary/meaning/tetrahedrite/
common sulfosalt mineral, an antimony sulfide of copper, iron, zinc, and silver [(Cu,Fe,Zn,Ag)12Sb4S13], that is an important ore of copper and ...
Found on
http://www.britannica.com/eb/a-z/t/30
<chemical> 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. ... Synonym: gray copper ore, fahlore, and panabase. ... Origin: So called because the crystals of the species are commonly tetrahedrons. ... Source: Websters Dic...
Found on
http://www.encyclo.co.uk/local/20973
Tet`ra·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
...Found on
http://www.encyclo.co.uk/webster/T/34
Tetrahedrite (grey copper ore, fahlore, or panabase), so called because the crystals of the species are commonly tetrahedrons, is sulphide of antimony and copper, with small quantities of other metals. It is an ore of copper and silver. It is commonly found in hydrothermal veins formed at low to moderate temperatures and is usually associated with ...
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http://www.probertencyclopaedia.com/browse/HT.HTM
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