1) Copper mineral 2) Orthorhombic mineral
Found on
https://www.crosswordclues.com/clue/rickardite
Rickardite is a copper telluride mineral (Cu7Te5) or Cu3-x (x = 0 to 0.36)Te2. It was first described for an occurrence in the Good Hope Mine, Vulcan district, Gunnison County, Colorado, USA, and named for mining engineer Thomas Arthur Rickard (1864–1953) (Thomas Rickard is his cousin). It is a low temperature hydrothermal mineral that occurs as...
Found on
http://en.wikipedia.org/wiki/Rickardite
copper telluride mineral with the formula Cu7Te5, the purple-red masses of which resemble tarnished bornite. It was discovered at Vulcan, Colo., ...
Found on
http://www.britannica.com/eb/a-z/r/47
No exact match found.
