Anthropogenic Sedimentary (Man Made)

Chert (Field-collected specimen)

Chert (Crystalline Silica, SiO2)

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Red Jasper

Jasper (Silicon Dioxide with Hematite inclusions), SiO2

Chert (Chert Nodule in Limestone)

Microcrystalline Quartz (SiO2)

Schist with Schorl (Black Tourmaline)

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Caribbean Calcite

Calcite and Aragonite (CaCO3)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Chert (often colloquially called Flint)

Chert (Microcrystalline Quartz, SiO2)

Carnelian (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (SiO2) - variety: Chalcedony

Jasper

Silicon dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Satin Spar (Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Geode (unopened)

SiO2 - Chert-shelled concretion (mostly Quartz)

Yellow Jasper

Chalcedony (SiO2)

Quartz (Microcrystalline variety)

Silicon Dioxide (SiO2)

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Orange Calcite

Calcium Carbonate (CaCO3)

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)

Gneiss

High-grade regional metamorphic rock (Foliated)

White Chalcedony (Agate)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Rough Quartz (likely Rose or Smoky variant)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Epidote

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

White Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Yellow Agate / Chalcedony

Silicon Dioxide (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Jasper River Pebble

Silicon Dioxide (SiO2) with iron oxide impurities

Satin Spar (Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Milky Quartz

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)