
1) Copper mineral 2) Monoclinic mineral
Found on
https://www.crosswordclues.com/clue/ziesite

Ziesite is a copper vanadate mineral with formula: β-Cu2V2O7. It was discovered in 1980 as monoclinic crystals occurring as volcanic sublimates around fumaroles in the crater of the Izalco Volcano, El Salvador. It is named after Emmanuel G. Zies (1883–1981), an American geochemist who studied Izalco in the 1930s. Closely related is blossite, al...
Found on
http://en.wikipedia.org/wiki/Ziesite
No exact match found.