Mineral (Native Element)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Bismuth Crystal

Bismuth (Bi)

Diamond

Diamond (pure Carbon, C)

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2)

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Fairy Stone (Staurolite Cross)

Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)

Copper Ore

Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)

Mica Schist

Mica Schist

Copper-rich rock, likely native copper-bearing material

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

Bismuth Crystal

Bismuth (Bi)

Likely gold-bearing sulfide mineral, possibly chalcopyrite

Chalcopyrite (CuFeS₂), tentative identification

Copper ore (cupriferous rock)

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

Auriferous Quartz or Pyritic Ore

Iron Pyrite (FeS2) or Native Gold (Au) in Matrix

Pegmatitic granite (quartz–feldspar rock)

Coarse-grained granitic pegmatite, chiefly quartz and feldspar with minor mica

Soapstone Carving (Pipestone/Catlinite possible)

Steatite or Argillite

Aquamarine

Beryl (Be3Al2Si6O18)

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Silver (Native Silver Mineral)

Ag (Native Silver), Alloyed 90% Ag / 10% Cu

Native Copper in Basalt

Amygdaloidal Basalt with Native Copper (Cu)

Likely weathered native copper-bearing rock

Unidentified copper-bearing specimen; native copper (Cu) is possible but cannot be confirmed visually

Pegmatitic granite fragment

Granitic pegmatite, chiefly quartz, feldspar, and mica

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Obsidian

Obsidian (Volcanic Glass)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Obsidian

Obsidian (principally SiO2 - Silicon Dioxide)

Gold-bearing quartz vein rock

Quartz (SiO₂) with probable native gold and iron-oxide minerals

Native copper-bearing rock

Native copper (Cu), likely with copper oxides/carbonates in a host rock

Sulfur

Sulfur (S)

Iron-stained quartz-rich rock (possibly ironstone)

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

Gold-bearing quartz in a dark host rock (possible gold-in-quartz specimen)

Quartz (SiO₂) with possible native gold (Au) in a fine-grained host; exact identification is uncertain from the photo

Snowflake Obsidian

Volcanic Glass with Spherulite Inclusions (primarily SiO2)

Amygdaloidal Basalt with Epidote

Amygdaloidal Basalt (Mafic volcanic rock)

Nickel

Nickel (Ni)

Bismuth Crystal

Bismuth (Bi)

Manganese Ore (Psilomelane/Pyrolusite)

Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)

Yellow iron-oxide-rich mineral/rock fragment

Likely limonite/goethite (hydrated iron oxides; commonly approximated as FeO(OH)·nH₂O)

Pink Granite

Phaneritic Igneous Rock (high K-Feldspar content)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)

Turquoise (possibly reconstituted or dyed howlite)

CuAl6(PO4)4(OH)8·4H2O (Hydrated Copper Aluminum Phosphate)