Rock Identifier

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Common Opal

Common Opal

Mudstone

Mudstone

Green Beryl

Green Beryl

Matte Obsidian

Sapphire

Sapphire

Hornfels

Hornfels

Argillite

Argillite

Black Jasper (Silicon dioxide (SiO2) with carbonaceous impurities) — sedimentary

Black Jasper

Silicon dioxide (SiO2) with carbonaceous impurities

sedimentary
Limestone with Fossil Fragments (Bioclastic Limestone (CaCO3)) — sedimentary

Limestone with Fossil Fragments

Bioclastic Limestone (CaCO3)

sedimentary
Red Sandstone (Ferruginous Sandstone (SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Ferruginous Sandstone (SiO2 with Fe2O3)

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

Flint or Chert

Microcrystalline Quartz (SiO2)

sedimentary
Jasper with Epidote (Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate) — sedimentary

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate

sedimentary
Pearl (Cultured Freshwater) (Calcium Carbonate (Aragonite) - CaCO3) — mineral

Pearl (Cultured Freshwater)

Calcium Carbonate (Aragonite) - CaCO3

mineral
Banded Agate (Silicon Dioxide (SiO2) - Variety Agate) — mineral

Banded Agate

Silicon Dioxide (SiO2) - Variety Agate

mineral
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

metamorphic
Green Aventurine (Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Green Aventurine

Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

mineral
Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

sedimentary
Quartzite river pebble (Quartzite (SiO2)) — metamorphic

Quartzite river pebble

Quartzite (SiO2)

metamorphic
Sandstone (Quartzite-rich) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

sedimentary
Quartzite River Stone (Quartzite (SiO2)) — metamorphic

Quartzite River Stone

Quartzite (SiO2)

metamorphic
Red Quartzite (Quartzite (mostly SiO2)) — metamorphic

Red Quartzite

Quartzite (mostly SiO2)

metamorphic
Quartzite Cobble (Metamorphic Rock (SiO2 dominated)) — metamorphic

Quartzite Cobble

Metamorphic Rock (SiO2 dominated)

metamorphic
Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

sedimentary
Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

sedimentary
Sandstone (Clastic sedimentary rock (primarily Quartz)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily Quartz)

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

Chert (Pebble)

Microcrystalline Quartz (SiO2)

sedimentary
Chert (varietal Jasper or Mudstone Flint) (Silicon dioxide (SiO2) with impurities) — sedimentary

Chert (varietal Jasper or Mudstone Flint)

Silicon dioxide (SiO2) with impurities

sedimentary
Quartzite Pebble (Metamorphosed Quartz-rich Sandstone) — metamorphic

Quartzite Pebble

Metamorphosed Quartz-rich Sandstone

metamorphic
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
River Stone/Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

River Stone/Chert Pebble

Microcrystalline Quartz (SiO2)

sedimentary
Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Chert (Yellow variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Yellow variety)

Microcrystalline quartz (SiO2)

sedimentary
Basalt (Extrusive Mafic Igneous Rock) — igneous

Basalt

Extrusive Mafic Igneous Rock

igneous
Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary
Quartz (Water-worn Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)

mineral
Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

mineral
Quartz Geode (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Chalcedony)

Silicon Dioxide (SiO2)

mineral
Chert Arrowhead (Lithic Artifact) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert Arrowhead (Lithic Artifact)

Chert (Cryptocrystalline Quartz, SiO2)

sedimentary
Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary
Quartz Geode in Sedimentary Host Rock (Silicon Dioxide (SiO2) in Carbonate Matrix) — sedimentary

Quartz Geode in Sedimentary Host Rock

Silicon Dioxide (SiO2) in Carbonate Matrix

sedimentary
Milky Quartz (Crystalline Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

mineral
Mookaite Jasper (Mookaite (Silicified radiolarite, SiO2)) — sedimentary

Mookaite Jasper

Mookaite (Silicified radiolarite, SiO2)

sedimentary
Amethyst (Silicon dioxide (SiO2)) — mineral

Amethyst

Silicon dioxide (SiO2)

mineral
Quartz (Chert/Chalcedony variety) (Silicon Dioxide (SiO2)) — sedimentary

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

sedimentary