Sedimentary (Chemically Precipitated) Or Metamorphic

Chert (variations include Flint/Jasper)

Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Iron-stained)

Chert (SiO2)

Chert with Quartz/Calcite Vein

Microcrystalline Silica (SiO2)

Chert (and associated Flint)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (varietal Flint or Jasper)

Microcrystalline Quartz (SiO2)

Chert Pebble (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Black Chert/Flint)

Cryptocrystalline Quartz (SiO2)

Schist with Schorl (Black Tourmaline)

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

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Gneiss (Granitic Gneiss)

Gneiss

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Chert (Grey Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, SiO₂)

Quartz Pebble (Sea Glass-like texture)

Silicon Dioxide (SiO2)

Basalt (River Stone)

Basalt (Mafic Extrusive Igneous Rock)

Sandstone (with potentially metamorphic or basaltic bands)

Arenite / Lithic Wacke

Limestone

Calcium Carbonate (CaCO3)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Adventurine (Green)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Crushed Limestone

Sedimentary Carbonate Rock (CaCO3)

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

Chert (Jasper-bearing)

Chert (Silicon Dioxide, SiO2)

Chert (Tan/Grey variety)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone

Arenite or Sandstone

Quartz

Quartz (SiO2)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Greenschist / Migmatite

Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)