Mineral Variant

Hematite (likely Botryoidal or Specularite variant)

Iron(III) oxide (Fe2O3)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Granite

Granite (Felsic Plutonic Rock)

Likely weathered granite or granitic gneiss

Granite: quartz + feldspar + mica; possible gneissic variant

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Weathered granite or granitic gneiss

Granite: quartz + feldspar + mica; possible gneissic variant

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron inclusions

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalcedony (Common Opal variant or Chert/Flint)

Silicon Dioxide (SiO2)

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Mahogany Obsidian

Volcanic Glass (High-silica Rhyolite)

Crushed Stone (Likely Granite or Diabase)

Intrusive Igneous Rock (Granitoid/Gabbroid)

Riverstone Jasper (Chert variant)

Silicon Dioxide (SiO2)

Pegmatite (White Granite variant)

Pegmatitic Granite (Quartz and Feldspar rich)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (Lithic Wacke)

Diamond

Carbon (C)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Quartz Geode

Silicon Dioxide (SiO2)

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Chert

Microcrystalline Quartz (SiO2)

Chert (concretionary/nodular variant)

Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions

Green Quartz (Prasiolite variant or Aventurine)

Silicon Dioxide (SiO2)

Chalk (Limestone variant)

Calcium Carbonate (CaCO3)

Chert (variant Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Flint variant)

Microcrystalline Quartz (SiO2)

Chert (variant Flint)

Silicon Dioxide (SiO2)

Granite or granitic gneiss

Coarse quartz–feldspar–mica rock; possible gneissic variant

Serpentine

Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Assorted Tumbled Gemstones

Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)

Chert (Brown Variety)

Microcrystalline quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)

Agate and Amethyst (Quartz variants)

Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz

Amethyst and Citrine (Quartz variants)

Silicon Dioxide (SiO2)