slgwv's photos with the keyword: malachite

Secondary copper carbonate minerals, from near-surface oxidation. On a displayed boulder at the mining museum in Jerome, AZ, a historical copper camp. I suspect there's also some chrysocolla, a secondary copper silicate that looks very similar to malachite.

From the waste dump at the Richmond Canyon mine, Berlin-Ichthyosaur State Park, Nevada, USA. The green appears to be malachite (a copper carbonate) and/or chrysocolla (a copper silicate). Elsewhere they say that the original processing in Ione failed due to the copper content; here's why! Probably they were trying amalgamation; the ore should have later been workable with cyanide.