Mineral (Native Element)

Copper-oxide ore (malachite-bearing copper ore)

Malachite, Cu₂CO₃(OH)₂, with likely chrysocolla and iron-oxide minerals

Small yellow mineral specimen, possibly sulfur

Unidentified; native sulfur (S) is a possibility

Banded fluorite point

Fluorite (calcium fluoride, CaF₂)

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Diamond (Uncut Crystal)

Carbon (C)

Diamond

Carbon (C)

Celestite (Celestine)

Celestine (SrSO4)

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Copper-rich rock, likely native copper-bearing material

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

Copper Ore

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

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)

Gold Ore in Quartz

Auriferous Quartz (Au + SiO2)

Bismuth Crystal

Bismuth (Bi)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Turquoise

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

Likely gold-bearing sulfide mineral, possibly chalcopyrite

Chalcopyrite (CuFeS₂), tentative identification

Orange calcite (likely honey calcite)

Calcite, calcium carbonate (CaCO₃)

Tumbled agate/chalcedony

Microcrystalline quartz (SiO₂), likely agate with iron-oxide and other mineral inclusions

White Topaz

Al2SiO4(F,OH)2

Soapstone Carving (Pipestone/Catlinite possible)

Steatite or Argillite

Copper ore (cupriferous rock)

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Quartz-rich pegmatite, possibly with mica and feldspar

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and biotite/muscovite mica

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Obsidian

Obsidian (Volcanic Glass)

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Auriferous Quartz or Pyritic Ore

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

Yellow iron-oxide-rich mineral/rock fragment

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

Likely native metallic mineral specimen

Uncertain from photograph; possibly pyrite (FeS₂) or a sulfide-rich metallic ore

Celestite (Celestine)

Strontium sulfate (SrSO4)

Obsidian

Obsidian (principally SiO2 - Silicon Dioxide)

Snowflake Obsidian

Volcanic Glass with Spherulite Inclusions (primarily SiO2)

Amygdaloidal Basalt with Epidote

Amygdaloidal Basalt (Mafic volcanic rock)

Bismuth Crystal

Bismuth (Bi)

Diamond

Diamond (pure Carbon, C)

Native copper-bearing rock

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

Mica Schist

Mica Schist

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18)