Sedimentary Or Igneous (Host Environment)

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Turquoise

Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O

Folded Schist / Gneiss (Metamorphic Rock)

Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Eudialyte in Matrix

Na15Ca6Fe3Zr3Si26O72(OH,Cl,H2O)3

Basalt with Mineral Vein (Cobble)

Basalt (with likely Quartz/Calcite vein)

Quartz pebble

Silicon dioxide (SiO2)

River Pebble (Gneiss or Quartzite mixture)

Metamorphic rock (Commonly Gneissic)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Chalcedony / SiO2)

Chert (Nodular)

Microcrystalline Silica (SiO2)

Plume Agate

Silicon Dioxide (SiO2)

Botryoidal Pyrite

Iron Sulfide (FeS2)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Crystalline Cluster)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Magnetite

Magnetite (Fe3O4)

Quartz with Pyrite

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Quartz-veined Siltstone/Greywacke

Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Chert (Jasper type)

Microcrystalline Quartz (SiO2)

Orca Agate

Chalcedony (SiO2) with various inclusions

Chalcedony

Cryptocrystalline Quartz (SiO2)

Shale

Fissile Siliciclastic Sedimentary Rock

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Turquoise in Matrix

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Jasper

Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Cryptocrystalline Quartz (Agate/Chert)

Silicon dioxide (SiO2)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion