Organic Gem Material (Botanical)

Basalt (Weathered)

Extrusive Igneous Rock (Mafic composition)

Chert (Hag Stone / Hole Stone)

Chert (Cryptocrystalline variety of Quartz, SiO2)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Brown variety)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Crinoidal)

Calcium Carbonate (CaCO3) - Limestone containing bioclasts

Chert (Chert Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Graphite Schist

C (Carbonaceous Schist)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossil Coral (Favosites)

Favosites (Order: Tabulata, Phylum: Cnidaria)

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Black Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone (containing Brachiopods)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chondrite Meteorite

Ordinary Chondrite (OC)

Gold (Elemental Metal)

Gold (Au)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Kyanite

Kyanite (Al2SiO5)

Pumice

Pumice (Amorphous volcanic glass)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and organic impurities

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)

Diamond (or Cubic Zirconia imitation)

Carbon (C) - Native Element

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Septarian Nodule (Thunder Egg)

Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)

Chert (Tan/Grey variety)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diamond (Princess Cut Gemstone)

Carbon (C)

Chert (specifically Red Chert / Jasper nodule)

Silicon dioxide (SiO2)

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Fossilized Coral

Anthozoa (Fossilized)