Man Made Material (Jewelry, Metal Alloy)

Gold-bearing Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Granite

Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Quartzite (Iron-stained)

Quartzite (SiO2 with iron oxides)

Turquoise and Hematite

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Shungite

Shungite (carbon-rich Precambrian rock)

Shungite

Shungite (Amorphous Carbon)

Gold Nugget

Native Gold (Au)

Hematite

Hematite, Iron(III) oxide (Fe2O3)

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Rhodonite

Manganese silicate (MnSiO3)

Scoria (Volcanic Rock)

Scoria (often basaltic scoria)

Laterite

Laterite (no specific mineral formula as it's a rock type)

Hypersthene

Hypersthene ((Mg,Fe)SiO3)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Gold in Matrix

Native Gold (Au)

Strawberry Quartz

Quartz with Hematite inclusions (SiO2 + Fe2O3)

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Ammonite Fossil

Ammonitida (Extinct subclass of Cephalopoda)

Pyrite (Fool's Gold) Ore

Iron Disulfide (FeS2)

Pyrite (locally known as Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Specular Hematite

Specularite (Iron Oxide, Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Gold Placer (Gold Flakes and Nuggets)

Native Gold (Au)

Gold (in Opaque Matrix/Jewelry)

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Amazonite

Potassium Aluminum Silicate (KAlSi3O8)

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Serpentinite

Serpentinite (composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite)

Pyrite

Iron Disulfide (FeS2)

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Pyrite and Sunstone

Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Polished Rhodonite Obelisk

Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3

Sunstone

Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3