Mineral (Native Element Alloy)

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2)

Copper ore, likely native copper in a host rock

Native copper (Cu), possibly with cuprite/iron-oxide matrix

Native Copper (in coinage alloy)

Copper (Cu)

Native Copper

Native Copper (Cu)

Bismuth

Bismuth (Bi)

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Rough Diamond

Diamond (Carbon, C)

Silver (Sterling Silver)

Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu

Gold Nugget

Native Gold (Au)

Copper

Native Copper (Cu)

Chromium (Chrome)

Chromium (Cr)

Arsenic (Native)

Arsenic (As)

Native Gold

Gold (Au)

Native copper (probable copper-rich mineral specimen)

Copper, Cu; possibly mixed with cuprite, malachite, and iron-oxide alteration minerals

Native bismuth

Bismuth (Bi), commonly artificially crystallized

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Copper-bearing rock, likely native copper in matrix

Native copper (Cu), possibly with cuprite/iron-rich matrix

Gold

Aurum (Elemental Gold, Au)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Copper-bearing rock, likely native copper in a matrix

Native copper (Cu), possibly with cuprite/malachite in a basaltic or porphyritic matrix

Bismuth Crystal

Bismuth (Bi)

Native copper nugget

Copper (Cu), commonly with cuprite and copper-oxide alteration

Bismuth

Bismuth (element Bi) with oxidized thin-film interference layer

Native Copper in Basalt

Cu-element in Mafic Volcanic Rock (Basalt)

Native copper nugget

Copper (Cu), often with cuprite or copper-oxide surface

Celestite (Celestine)

Strontium sulfate (SrSO4)

Native Gold Flake

Gold (Au)

Gold bullion bars

Native gold (Au), likely cast or refined metal

Copper-bearing rock, likely native copper in a weathered matrix

Native copper (Cu), tentatively with copper sulfide/oxide minerals

Amethyst (Purple), Sulfur (Yellow), and Blue Apatite

SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Polished native copper

Native copper (Cu), likely with cuprite/tenorite oxidation products

Native copper-bearing rock (probable copper ore)

Native copper (Cu), likely with cuprite (Cu₂O), malachite (Cu₂CO₃(OH)₂), and iron-oxide matrix

Native copper-bearing rock (probable copper ore)

Native copper (Cu), likely with copper sulfide/oxide minerals in a host rock

Gold Ore (in Quartz/Gossan matrix)

Native Gold (Au) in Limonite/Quartz matrix

Bismuth Crystal

Bismuth (Bi)

Copper ore (likely cuprite-bearing copper mineralization)

Cuprite, Cu₂O, possibly mixed with native copper and iron oxides

Copper ore (cupriferous rock)

Native copper with copper oxides, likely cuprite (Cu₂O) and malachite/azurite alteration

Celestite (Celestine)

Strontium sulfate (SrSO4)

Copper-rich rock, likely native copper-bearing material

Native copper (Cu), possibly mixed with cuprite/iron oxides in a copper-rich matrix

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown