Organic Specimen (Fossil)

Coral Fossil Rock (Syringopora)

Syringopora (Organ-pipe Coral fossil in Limestone matrix)

Sandstone concretion

Arenite sedimentary rock (concretion/nodule)

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Travertine (Tufa)

Chemical Limestone (CaCO3)

Amber (Rough Baltics/Beach Specimen)

Succinicum (Organic Gemstone - Fossilized Resin)

Petrified Dinosaur Bone (Gembone)

Agatized Dinosaur Bone

Weathered flint or chert fragment

Microcrystalline quartz (SiO₂), likely chert/flint

Chert (Green Jasperiod)

Chert (Microcrystalline Quartz, SiO2)

Limestone

Sedimentary Rock (Primarily CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Moss Agate

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

Quartz Geode

Silicon Dioxide (SiO2)

Reddish Brown Claystone or Siltstone

Argillite / Siltstone / Claystone

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Limestone

Calcium Carbonate (CaCO3)

Fossilized Gastropod Internal Mold

Steinkern (Mollusca: Gastropoda)

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Chert (Tan/Grey variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Yellow Chert (Chalcedony)

Microcrystalline Quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions

Banded Chert

Silicon dioxide (SiO2) with impurities

Chert (specifically Flint or Dark Chert)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Chert Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Red Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz grains)

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Sand Dollar

Echinoidea (Clypeasteroida)

Petrified Wood

Silicified Wood (SiO2)

Sea Urchin Fossil

Echinoidea (test/fossil)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Amber (Raw Copal)

Fossilized Plant Resin (Gummite/Succinite)

Jasper (likely Kambaba or Crocodile Jasper variety)

Silicon Dioxide (SiO2) with inclusions

Banded Agate (Dyed)

SiO2 (Silicon Dioxide / Microcrystalline Quartz)

Chert (Smooth River Stone)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Weathered)

Chert (Microcrystalline Quartz, SiO2)