Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Coquina (Biogenic calcarenite / Coquina (CaCO3)) — sedimentary

Coquina

Biogenic calcarenite / Coquina (CaCO3)

Amethyst (SiO2 (Silicon Dioxide with iron impurities)) — mineral

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Banded Mudstone (Siltstone Pebble) (Siltstone / Argillite (Fossiliferous Mudstone)) — sedimentary

Banded Mudstone (Siltstone Pebble)

Siltstone / Argillite (Fossiliferous Mudstone)

Chert (Jasper/Flint variety) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Silica (SiO2)

Riverstone Jasper (Silicon Dioxide (SiO2) with iron/clay inclusions) — sedimentary

Riverstone Jasper

Silicon Dioxide (SiO2) with iron/clay inclusions

Tumbled Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Tumbled Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — sedimentary

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chert (Arrowhead/Projectile Point) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead/Projectile Point)

Cryptocrystalline Quartz (SiO2)

Amethyst (Quartz (SiO2) with iron impurities) — mineral

Amethyst

Quartz (SiO2) with iron impurities

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Green Aventurine (Aventurine Quartz (SiO2 with Fuchsite inclusions)) — mineral

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

Limonite / Goethite (Ironstone) (Hydrated Iron(III) Oxide-Hydroxide FeO(OH)wnH2O) — sedimentary

Limonite / Goethite (Ironstone)

Hydrated Iron(III) Oxide-Hydroxide FeO(OH)wnH2O

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Limonite (Yellow Ochre) (Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)) — mineral

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Chalcedony (Agate/Jasper mix) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chalcedony (Agate/Jasper mix)

Cryptocrystalline Quartz (SiO2)

Sandstone with Iron Staining (Arenite (SiO2 with Fe2O3)) — sedimentary

Sandstone with Iron Staining

Arenite (SiO2 with Fe2O3)

Quartzite with Iron Inclusions (Metamorphic Quartz (SiO2) with Hematite/Limonite) — metamorphic

Quartzite with Iron Inclusions

Metamorphic Quartz (SiO2) with Hematite/Limonite

Brown Sandstone (River Rock) (Arenite) — sedimentary

Brown Sandstone (River Rock)

Arenite

Chert Nodule in Limestone (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodule in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Gold Nugget Cluster (Native Gold (Au)) — mineral

Gold Nugget Cluster

Native Gold (Au)

Gray Limestone (Carbonate rock (CaCO3)) — sedimentary

Gray Limestone

Carbonate rock (CaCO3)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Light Green Quartzite (Metamorphosed Quartz Sandstone (SiO2 with chlorite or mica inclusions)) — metamorphic

Light Green Quartzite

Metamorphosed Quartz Sandstone (SiO2 with chlorite or mica inclusions)

Aura Quartz / Rainbow Aura Quartz (Silicon Dioxide (SiO2) with metallic vapor coating) — mineral

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Turquoise (Dyed Howlite/Magnesite) (CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)) — mineral

Turquoise (Dyed Howlite/Magnesite)

CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)

Chert (Chalcedony/Agate Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Agate Pebble)

Microcrystalline Quartz (SiO2)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Banded Chalcedony (Agate) (Silicon Dioxide (SiO2)) — mineral

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2)

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Blue Sapphire and Diamond (Set in Metal) (Corundum (Al2O3) and Diamond (C)) — mineral

Blue Sapphire and Diamond (Set in Metal)

Corundum (Al2O3) and Diamond (C)

Basalt River Cobble (Basalt) — igneous

Basalt River Cobble

Basalt

Gold Flake (Native Gold (Au)) — mineral

Gold Flake

Native Gold (Au)

Costume Jewelry with Synthetic Gemstones (Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)) — mineral

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Black Onyx (Silicon dioxide (SiO2)) — mineral

Black Onyx

Silicon dioxide (SiO2)

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)