Organic Specimen (Fossil)

Ambergris (Geological/Organic Specimen)

Ambra grisea (Produced by Physeter macrocephalus)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline silicon dioxide (SiO2)

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper (Petrified Wood Variety)

Silicon Dioxide (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Pink Opal

Hydrated silicon dioxide (SiO2·nH2O) with inclusions

Fossilized Fish (Lepidotes)

Lepidotes sp. (Order: Lepisosteiformes)

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Turritella Agate

Silicified Elimia tenera Fossil (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions

Ammonite Fossil in Limestone Matrix

Ammonoidea (subclass) in Calcium Carbonate (CaCO3)

Jasper

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Crushed Limestone

Calcium Carbonate (CaCO3)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Spinosaurid Dinosaur Tooth

Spinosaurus aegyptiacus (fossilized)

Fossilized Oyster Shell

Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)

Limestone

Calcareous sedimentary rock (primarily CaCO3)

Chert (and Limestone)

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2)

Chert (specifically as a lithic artifact/projectile point)

Chert (Silicon dioxide, SiO2)

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Aragonite (Star Cluster or Twinned variety)

Aragonite (Calcium Carbonate, CaCO3)

Pink Opal

Hydrated Silica (SiO2·nH2O)

Amber

Succinicum (C10H16O)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amber (Rough Baltics/Beach Specimen)

Succinicum (Organic Gemstone - Fossilized Resin)

Chert (Jasper variety)

Silicon Dioxide (SiO2) with iron oxide impurities

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Chert (specifically Pink/Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Brown variety)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Quartz Variety)

Silicon Dioxide (SiO2)