Sedimentary (Anthropogenic)

Galena

Lead Sulfide (PbS)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite (Fools Gold)

Iron Sulfide (FeS2)

Amethyst Geode

Silicon Dioxide (SiO2) with iron impurities

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Turquoise

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

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Pyrite

Iron Disulfide (FeS2)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Iron-stained Quartzite / Chert

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Agate (specifically a small Chalcedony nodule)

Agate (Cryptocrystalline variety of Quartz, SiO2)

sedimentary (microcrystalline quartz)

Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

Satin Spar (Selenite Gypsum Sphere)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Chert (Jasper type)

Microcrystalline Quartz (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Galena

Lead Sulfide (PbS)

Gneiss (specifically a water-worn pebble)

Gneiss

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Galena

Lead(II) sulfide (PbS)

Orange Calcite

Calcium Carbonate (CaCO3)

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Carnelian

Carnelian Chalcedony (SiO2 with iron oxide impurities)

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

Green Calcite

Calcite (CaCO3)

Quartz

Silicon Dioxide (SiO2)