Organic (Biological Specimen)

Chert (or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Common Opal variant)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and/or Siltstone River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert

Chert (Microcrystalline Silica, SiO2)

Jasper (specifically Chert/Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Quartzite pebble

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Diorite (River Cobble)

Intermediate Phaneritic Plutonic Rock

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Schist

Mica Schist

Chert (Arrowhead Artifact)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Common Opal/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Quartzite (River Cobble)

Quartzite (predominantly SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Granite

Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Granite

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)

Milky Quartz (Gold-bearing Prospecting Specimen)

Silicon Dioxide (SiO2)

Chert (and/or Flint)

Silicon Dioxide (SiO2)

Script Jasper

Cryptocrystalline Quartz (SiO2) with fossiliferous inclusions

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (specifically Flint or Dark Chalcedony)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

Diorite (River Cobble)

Phaneritic Intermediate Plutonic Rock

Chert (Chert / Flint nodule)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Granite

Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), primarily Calcium Carbonate (CaCO3)

Chert (Nodule)

Cryptocrystalline Silica (SiO2)

Chert Pebble / Brachiopod Fossil Internal Mold

Silicon Dioxide (SiO2) / Fossil: Brachiopoda (generic internal mold)

Calcite

Calcite (CaCO3)

Chert Pebble (Jasperoid/Flint)

Silicon Dioxide (SiO2) - cryptocrystalline quartz

Fossil Coral

Fossilized Scleractinia or Tabulata (various genera/species)