Anthropogenic Specimen (Man Made Material)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert

Chert (microcrystalline quartz)

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Labradorite (Polished Crystal Point)

Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8

Tiger's Eye

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Pyrite

Iron Disulfide (FeS2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Moss Agate

Chalcedony (Silicon Dioxide - SiO2) with inclusions

Ferruginous Quartz Cobble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Green Fluorite in Host Rock

Fluorite (Calcium Fluoride, CaF2)

Granite (Pink/Red variety)

Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Chert (varieties include Jasper or Flint)

Chert (Microcrystalline Silica, formula: SiO2)

Chert (Pebble)

Microcrystalline silica (SiO2)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Green Moss Agate

Silicon Dioxide with inclusions (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Tektite (Indochinite)

Tektite (High-silica natural glass)

Blue Lace Agate

Chalcedony (SiO2) with trace inclusions

Basalt (River Pebble)

Basalt

Chert (or Chalcedony)

Chert (Microcrystalline Quartz, SiO2)

Siltstone with flute casts or scratch marks

Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Quartz Pebble (with probable inclusions or staining)

Quartz (Silicon Dioxide - SiO2)

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Chalk

CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock