Organic (Biological Specimen)

Horn Coral Fossil

Rugosa (Order Rugosa)

Quartzite

Quartzite (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Granite

Intrusive Phaneritic Felsic Igneous Rock

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Quartzite cobblestone

Quartzite (primarily SiO2)

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

Quartzite Pebble

Quartzite (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Banded Chert (River Cobble)

Microcrystalline Quartz (SiO2)

Chert Pebble

Microcrystalline silica (SiO2)

Quartzite Cobble

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Chert (Arrowhead/Projectile Point)

Cryptocrystalline Quartz (SiO2)

Quartzite Pebble

Metamorphic Rock (composed mainly of SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Chert (Flint variety)

Chert (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite River Rock

Quartzite (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Opal variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variably called Jasper or Agate)

Microcrystalline Quartz (SiO2)

Tabulate Coral Fossil (Favosites)

Favosites (Commonly known as Honeycomb Coral)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Limestone Cobble

Sedimentary Limestone (CaCO3)

Chert (Yellow Jasper/Flint)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (SiO2)

Yellow Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), often preserved in Limestone or Calcite (CaCO3)

Quartzite River Rock

Metamorphosed Quartz-rich Sandstone (SiO2)

Chert (Flint variety)

Chert (SiO2)

Yellow Chert (River Stone/Pebble)

Chert (Cryptocrystalline Quartz, SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Chert (Jasper variety)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (variously known as Flint or River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Coquina or Fossilized Shell Fragment

Calcium Carbonate (CaCO3) / Biogenic Limestone