Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Gneiss

Gneiss (High-grade regional metamorphic rock)

Clear Quartz

Silicon Dioxide (SiO2)

Limonite (Iron Ore Congcretion)

Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Vesicular Basalt

Basalt (principally Plagioclase and Pyroxene)

Basalt Pebble

Basalt

Clear Quartz

Silicon Dioxide (SiO2)

Crushed Stone (Basalt/Gabbro)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Lapis Lazuli

Lazurite-rich metamorphic rock (complex silicate)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Greenschist

Chlorite schist (Metamorphic rock dominated by chlorite, epidote, and actinolite)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Green Calcite

Calcium Carbonate (CaCO3)

Imperial Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions

Scoria

Vesicular Basalt / Scoria

Amethyst

Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities

Green Calcite (often commercially called Green Onyx)

Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Larvikite

Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, augite, and biotite)

Septarian Nodule (Septarian Dragon Stone)

Septarian concretion (composition: Calcite CaCO3, Aragonite CaCO3, and Limestone/Clay)

Sandstone (specifically Double Arch in Arches National Park)

Entrada Sandstone

Red Granite

Phaneritic Plutonic Felsic Rock (rich in Potassium Feldspar)

Pink Granite (Alkali Feldspar Granite)

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8)

Aragonite Star Cluster

Aragonite (Calcium Carbonate - CaCO3)

Basalt

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Chalcedony (Agate/Chert)

Microcrystalline Quartz (SiO2)

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Blue Calcite

Calcium Carbonate (CaCO3)

Vesicular Basalt

Extrusive Mafic Igneous Rock

Honey Calcite Geode Segment

Calcite (Calcium Carbonate, CaCO3)

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Chert (specifically Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Scoria (Lava Rock)

Scoria (vesicular basaltic rock)

Scoria (Lava Rock)

Scoria (extrusive volcanic rock)