Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Ferruginous Sandstone (Red Sandstone)

Arenite with Hematite/Limonite cement

Cubic Zirconia (CZ)

Cubic Zirconium Dioxide (ZrO2)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Travertine (Tufa)

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 predominantly)

Quartzite

Quartzite (primarily SiO2)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Sapphire (Raw/Rough)

Corundum (Al2O3)

Granitic Gneiss

Gneiss (containing Potassium Feldspar and Quartz)

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Diamond (or Lab-Grown Cubic Zirconia)

Carbon (C)

Quartzite

Quartzite (SiO2)

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Yellow Jasper

Silicon Dioxide with iron inclusions (SiO2)

Fossilized Favosites (Honeycomb Coral)

Favosites (extinct genus of tabulate coral)

Fossiliferous Limestone (Coquina / Shell Limestone)

Bioclastic Limestone (CaCO3)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Green Quartzite

Meta-quartzite with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz with Mica (Micaceous Quartz)

Silicon Dioxide (SiO2) with Phyllosilicates

Sandstone (Ferruginous)

Arenite with Iron Oxide matrix

Mica Schist (Garnetiferous)

Garnet-Mica Schist

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Coral Fossil (Favosites)

Favosites (Extinct genus of tabulate corals)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Fossilized Coral (Petoskey-like or Favosites)

Anthozoa (Fossilized Coral)

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (Iron-stained)

Chert (Cryptocrystalline Silica, SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Green Calcite (Onyx Marble)

Calcium Carbonate (CaCO3)

Copper-bearing Mica Schist

Mica Schist with Native Copper inclusions

Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Garnet (likely Almandine or Pyrope)

Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 principal composition)