1) Lead mineral 2) Monoclinic mineral
Found on
https://www.crosswordclues.com/clue/grandreefite
Grandreefite is a rare secondary lead sulfate-fluoride mineral with a general chemical formula, Pb2SO4F2. It is named for the location in which it was discovered in 1989, the Grand Reef Mine in Graham County, Arizona. Grandreefite is monoclinic, falling in the 2/m symmetry group. Crystallographically this means, grandreefite has three axes of uneq...
Found on
http://en.wikipedia.org/wiki/Grandreefite
No exact match found.
