Mineral (Native Element)

Gold Ore

Gold-bearing Quartz (Native Gold, Au)

Native gold nugget or flake

Native gold (Au), possibly with minor silver/electrum

Malachite-bearing rock

Malachite, Cu₂CO₃(OH)₂, likely with chrysocolla or matrix minerals

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2

Gold-bearing quartz vein rock (probable pyrite-rich schist or quartzite)

Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), and possible native gold

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Buffalo Nickel (Indian Head Nickel)

Cupronickel (75% Copper, 25% Nickel)

Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2 with iron oxide inclusions

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Gold-bearing quartz vein material (likely native gold with sulfides)

Native gold (Au), probably with quartz (SiO₂) and iron/copper sulfide minerals

Pink Howlite (Dyed)

Dyed Howlite / Silicoborocalcite (Ca2B5SiO9(OH)5)

Polished banded agate (likely blue lace agate)

Chalcedony, microcrystalline SiO₂, with iron and other trace-element impurities

Tiny metallic mineral fragment, possibly native gold

Native gold (Au), unconfirmed; could also be pyrite or chalcopyrite

Malachite cabochon or polished bead

Malachite, Cu₂CO₃(OH)₂

Quartz-rich iron-stained nodule

Microcrystalline quartz (SiO₂), possibly chalcedony with limonite/goethite staining

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Iron sulfide-rich ore, possibly pyrite-bearing gossan

Likely pyrite (FeS₂) with iron oxides/hydroxides and host rock; exact identification requires testing

Industrial slag (iron/copper smelting slag)

Multiphase vitreous metallurgical slag; commonly iron-silicate glass with metal-oxide and metallic inclusions

Gold-bearing quartz vein in dark host rock

Native gold (Au) with quartz (SiO₂), likely in a mafic or metamorphic host

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Bismuth

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

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Graphite

Graphite (Native Carbon), Formula: C

Gold-bearing Quartz (Auriferous Quartz)

Quartz (SiO2) with native Gold (Au) inclusions

Gold Ore in Quartz/Matrix

Native Gold (Au) in Quartz (SiO2) matrix

Sunstone

Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions

Chert

Chert (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Gold-bearing Quartz

Auriferous Quartz (SiO2 with Native Gold inclusion)

Standing Liberty Quarter (Silver Specimen)

Native Silver alloy (Ag with Cu traces)

Gold in Quartz

Hydrothermal Quartz with Native Gold (SiO2 with Au)

Sandstone Concretion

Moqui Marble (Iron-oxide concretion)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Thunder Egg (Agate/Jasper filled)

Chalcedony variety Agate/Jasper in a Rhyolitic matrix

Green Jasper

Silicon Dioxide (SiO2) with impurities

Pyrite-bearing rock (likely pyrite-rich quartz or schist)

Pyrite, FeS₂, intergrown with quartz and/or mica-rich matrix

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminosilicate), commonly with malachite and quartz

Malachite

Malachite — Cu₂CO₃(OH)₂, copper carbonate hydroxide

Native Copper with Cuprite and Quartz

Copper (Cu), Cuprite (Cu2O), Quartz (SiO2)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8