Organic Specimen (Fossil)

Chert

Chert (Microcrystalline Silica, SiO2)

Jasper (specifically Chert/Ironstone)

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

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: Calcium Carbonate / Calcite, Aragonite, and Limestone/Clay)

Picture Jasper

Silicon Dioxide (SiO2) - Opaque Impure Chalcedony

Mookaite Jasper

Silicified Radiolarite (SiO2)

Sandstone with Manganese Dendrites

Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)

Limestone

Sedimentary Limestone (Calcium Carbonate, CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Spondylus Oyster Calcification / Fossilized Oyster

Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)

Dendritic Agate (River Pebble)

Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Jet

Lignite (Anthracite-grade compact coal)

Mookaite Jasper

Silicon Dioxide (SiO2) - variety of Chert/Jasper

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Dragon Blood Jasper (also known as Dragon Stone)

Epidotized septarian concretion or Jasper/Epidote breach (typically a combination of Epidote and Pietersite or Red Jasper)

Quartzite pebble

Quartzite (primarily SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Conglomerate

Conglomerate (clastic sedimentary rock)

Orbicular Jasper (Eye Jasper / Kambaba-like pattern)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Dendritic Opal

Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Hexagonaria (Petoskey Stone)

Hexagonaria percarinata (Fossilized Rugose Coral)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Diorite (River Cobble)

Intermediate Phaneritic Plutonic Rock

Travertine

Calcareous Tufa (CaCO3)

Zebra Rock (Zebra Stone / Ribbon Stone)

Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)

Limestone

Calcareous Sedimentary Rock (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Atlantic Calico Scallop (Biogenic Aragonite/Calcite)

Argopecten gibbus (Chemical: CaCO3)

Bay Scallop Shell

Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)

Septarian Nodule

Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)

Quartzite with inclusions

Quartzite (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Schist

Mica Schist

Chert (Arrowhead Artifact)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Pink Orthoclase Feldspar with Dendrites

Orthoclase (KAlSi3O8) with Manganese Oxide dendrites

Liesegang Banded Sandstone (Wonderstone)

Ferruginous Sandstone with Liesegang Rings