Metamorphic Or Mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Agate

Agate (Silicon Dioxide, SiO2)

Lapis Lazuli

Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Corundum (Ruby Variety)

Corundum (Al2O3)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Rhodochrosite in Quartz

Manganese Carbonate (MnCO3)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Prase Quartz on Feldspar

Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)

Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Potassium Feldspar (Orthoclase)

KAlSi3O8

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Schist

Mica Schist (primarily Muscovite and Quartz)

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

White Marble

Recrystallized Calcite (CaCO3)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Epidote (likely Pistacite in Epidosite rock)

Epidote: Ca2(Al,Fe)3(SiO4)3(OH)

Peach Aventurine

Silicon Dioxide (SiO2) with inclusions

River Cobble (Salt and Pepper Gneiss)

Gneiss (High-grade regional metamorphic rock)

Rhodonite

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

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Red Garnet (Pyrope or Almandine)

Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Green Kyanite

Kyanite (Al2SiO5)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Greenstone

Greenschist (containing chlorite, epidote, and actinolite)