Synthetic (Not A Natural Rock)

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Yellow Jasper

Silicon Dioxide with iron inclusions (SiO2)

Agate Geode

Cryptocrystalline Quartz (SiO2)

Unakite (or Epidotized Granite)

Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Granite Gneiss

High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)

Red Sandstone

Arenite (composed primarily of SiO2 with Fe2O3 cementation)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (predominantly Silicon Dioxide - SiO2)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Chert (specifically Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Granite

Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)

Amygdaloidal Basalt

Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)

Amethyst (Quartz)

Amethyst (SiO2 with iron impurities)

Limestone Breccia

Sedimentary Breccia (Calcareous)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Granite Cobble

Granitoid (typically containing Quartz SiO2, Feldspar KAlSi3O8, and Mica minerals)

Anthracite Coal

Anthracite (Carbon-based solid)

Okenite (in Zeolite matrix)

Okenite (CaSi2O5 · 2H2O)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)

Amethyst (Tumbled Stone)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Larvikite

Larvikite (Anorthoclase-rich Monzonite)

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Coquina

Coquina (Bioclastic Limestone)

Greenschist

Chlorite-actinolite schist

Andesite

Andesite (Intermediate Volcanic Rock)

Basalt

Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)

Native Gold Nugget

Native Gold (Au)

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Amethyst

Silicon Dioxide (SiO2) with trivalent iron (Fe3+) impurities

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)