Man Made Alloy (Metallic)

Graphite

Graphite (C)

Muscovite Mica

Muscovite: KAl2(AlSi3O10)(OH)2

Gold Nugget

Native Gold (Au)

Quartz with Chalcopyrite and Pyrite

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Sunstone (Heliolite)

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

Red Hematite (Iron Ore)

Hematite (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Gold Nugget

Native Gold (Au)

Pyrite (Fool's Gold) Cube

Iron Sulfide (FeS2)

Milky Quartz with Dendritic Inclusions

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Lapis Lazuli

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

Peacock Ore (Bornite/Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Magnetite (Small Granule)

Magnetite (Fe3O4)

Labradorite (Larvikite variety)

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

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions

Sunstone (Feldspar)

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

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Botryoidal Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Pyrite

Iron Sulfide (FeS2)

Pyrite Geode

Iron Disulfide (FeS2)

Gold Nugget

Native Gold (Au)

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Gold Nugget

Native Gold (Au)

Pyrite (on Quartz matrix)

Iron Disulfide (FeS2)

Native Gold (in earring form)

Gold (Au)

Ironstone Concretion (Moqui Marble)

Hematite/Goethite Concretion (Fe2O3 / FeO(OH))

Pyrite

Iron Sulfide (FeS2)

Sunstone (Feldspar variety)

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

Sunstone

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

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Sunstone

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

Pyrite

Iron Sulfide (FeS2)