Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)

Red Jasper (Banded Jasper)

Jasper (Silicon Dioxide, SiO2)

Jasper

Silicon dioxide (SiO2)

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Jasper

Silicon Dioxide (SiO2) with impurities

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Yellow Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

White Chalcedony (Agate)

Silicon Dioxide (SiO2)

Fossil Shell Fragment (possibly Brachiopod or Bivalve)

Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca

Chert (Jasper/Ironstone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Gneiss

Gneiss (High-grade regional metamorphic rock)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Dolomite or Limestone (Carbonate Rock)

CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Turquoise (Rough Specimens)

Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Chert with Quartz Veining

Silicon Dioxide (SiO2)

Yellow Jasper

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moss Agate

Agate (Silicon Dioxide, SiO2) with dendritic inclusions

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Satin Spar (often marketed as Selenite)

Fibrous Gypsum (CaSO4·2H2O)

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Limestone with Fossil inclusions

Fossiliferous Limestone (CaCO3)

Petrified Wood

Silicified Wood (primarily SiO2)

Limonite (Iron Ore)

Limonite; FeO(OH)·nH2O

Jasper

Jasper / Silicon Dioxide (SiO₂)

Coarse-grained Jasper or Jasper Conglomerate

Silicon Dioxide with Iron Oxide (SiO2) + Fe2O3

Spinosaurus Tooth Fossil

Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)

Yellow Jasper

Tectosilicates (SiO2) with Goethite/Iron oxide inclusions

Red Jasper

Jasper (Silicon Dioxide based crypto-crystalline Quartz with Iron inclusions)

Mookaite Jasper

Radiolarite (SiO2 with impurities)

Limestone

Calcium Carbonate (CaCO3)

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Mookaite Jasper

Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)