Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Banded Agate (Agate (Silicon Dioxide, SiO2)) — sedimentary

Banded Agate

Agate (Silicon Dioxide, SiO2)

Silicon Carbide (Carborundum) (Silicon Carbide (SiC)) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Banded Agate (Polished Slice) (Chalcedony (SiO2) with Quartz) — mineral

Banded Agate (Polished Slice)

Chalcedony (SiO2) with Quartz

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Yellow Jasper (Silicon Dioxide (SiO2) - variety Jasper) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) - variety Jasper

Clear Quartz (Silicon dioxide (SiO2)) — mineral

Clear Quartz

Silicon dioxide (SiO2)

Banded Agate (Cryptocrystalline variety of Quartz (SiO2)) — sedimentary

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)

Red Quartzite (Quartzite (primarily SiO2 with hematite impurities)) — metamorphic

Red Quartzite

Quartzite (primarily SiO2 with hematite impurities)

Banded Siltstone Pebble (Siltstone (primarily SiO2, Al2O3, Fe2O3)) — sedimentary

Banded Siltstone Pebble

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Chert Nodule (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Quartz (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Dalmatian Jasper (Peralkaline rhyolite with arfvedsonite inclusions) — igneous

Dalmatian Jasper

Peralkaline rhyolite with arfvedsonite inclusions

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Dyed Agate Slice (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Dyed Agate Slice

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Sandstone Cobble (Arenite (primarily Quartz Arenite)) — sedimentary

Sandstone Cobble

Arenite (primarily Quartz Arenite)

Chert (Jasper/Flint variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Graywacke (River Cobble) (Lithic Sandstone (Graywacke)) — sedimentary

Graywacke (River Cobble)

Lithic Sandstone (Graywacke)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Earthy Hematite / Goethite Surface (Iron Oxide (Fe2O3 – α-FeO(OH))) — mineral

Earthy Hematite / Goethite Surface

Iron Oxide (Fe2O3 – α-FeO(OH))

Limonite-stained Gossan/Ironstone (Goethite and Hematite (Fe2O3 • nH2O)) — sedimentary

Limonite-stained Gossan/Ironstone

Goethite and Hematite (Fe2O3 • nH2O)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Quartzite river stone (Quartzite (SiO2)) — metamorphic

Quartzite river stone

Quartzite (SiO2)

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

Banded Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

River Stone (Limestone) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

River Stone (Limestone)

Sedimentary Calcium Carbonate (CaCO3)

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

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

Chert (Jasper)

Silicon Dioxide (SiO2)

Quartzite Cobble (Metamorphosed Sandstone (SiO2)) — metamorphic

Quartzite Cobble

Metamorphosed Sandstone (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Red Jasper with Quartz (Microcrystalline Quartz (SiO2) with Hematite inclusions) — sedimentary

Red Jasper with Quartz

Microcrystalline Quartz (SiO2) with Hematite inclusions

Agate Geode Slice (Silicon Dioxide (SiO2) with trace elements) — sedimentary

Agate Geode Slice

Silicon Dioxide (SiO2) with trace elements