1) Silver mineral
Found on
https://www.crosswordclues.com/clue/polybasite
Polybasite is a sulfosalt mineral of silver, copper, antimony and arsenic. Its chemical formula is [(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]. It forms black monoclinic crystals (thin, tabular, with six corners) which can show dark red internal reflections. It has a Mohs hardness of 2.5 to 3. It is found worldwide and is an ore of silver. The name comes from t...
Found on
http://en.wikipedia.org/wiki/Polybasite
• (n.) An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic.
Found on
http://thinkexist.com/dictionary/meaning/polybasite/
heavy, black sulfosalt mineral, a sulfide of the elements silver, copper, and antimony ([Ag, Cu]16Sb2S11), that occurs as monoclinic crystals and ...
Found on
http://www.britannica.com/eb/a-z/p/89
Pol`y·ba'site noun [ See
Polybasic .]
(Min.) An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic.
Found on
http://www.encyclo.co.uk/webster/P/120
Polybasite has the formulae (Ag,Cu)16SbS11 and a relative hardness of 3. It is an ore of silver and resembles hematite but is much softer.
Found on
http://www.probertencyclopaedia.com/browse/HP.HTM
No exact match found.
