Sedimentary (Artificial)

Travertine

Calcareous Tufa / Travertine (CaCO3)

Chalcedony / Agate

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Caribbean Calcite

Calcium Carbonate (CaCO3) with Aragonite (CaCO3)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Blue Chalcedony

Silicon Dioxide (SiO2)

Agate with Druzy Quartz

Silicon Dioxide (SiO2)

Hematite (Iron Ore)

Hematite (alpha-Fe2O3)

Chert (Flint)

Chert (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Aragonite (Banded Calcite / 'Mexican Onyx')

Aragonite (Calcium Carbonate - CaCO3)

Limonite

Limonite (FeOO·nH2O)

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Orange Calcite

Calcium Carbonate (CaCO3)

Red Jasper (Brecciated Jasper)

SiO2 (Silicon Dioxide) with Ferric Iron inclusions

Clear Quartz

Silicon Dioxide (SiO2)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Satin Spar Selenite

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Muscovite Schist with Quartz

KAl2(AlSi3O10)(OH)2 in Schistose matrix

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Fossilized Echinoid (Sea Urchin)

Echinoidea (Class), often found as calcitic fossils

Chalcedony (Agate/Chert)

Silicon Dioxide (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Hag Stone

Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Red Sandstone

Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Ferruginous Sandstone

Sandstone, Iron-rich

Petrified Wood

Fossilized wood / Silicified wood

Petrified Wood

Silicified Wood (primarily SiO2)

Yellow Quartzite or Yellow Jasper

Quartzite (primarily SiO2 with Iron oxide staining)

Amber

Succinicum (Formula: C10H16O)

Quartzite River Rock

Quartzite (primarily SiO2)