Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Limestone with Lichen (Carbonate Sedimentary Rock (primarily CaCO3)) — sedimentary

Limestone with Lichen

Carbonate Sedimentary Rock (primarily CaCO3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Black Flint) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Black Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Common Opal/Chalcedony nodule) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Chalcedony nodule)

Microcrystalline Quartz (SiO2)

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Red Sandstone (Siltstone pebble) (Arenite / Siltstone (Silicon dioxide based with hematite impurities)) — sedimentary

Red Sandstone (Siltstone pebble)

Arenite / Siltstone (Silicon dioxide based with hematite impurities)

Quartz Druzy (on Matrix) (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

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

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz (likely heat-treated or colored cord) (Silicon Dioxide (SiO2)) — mineral

Quartz (likely heat-treated or colored cord)

Silicon Dioxide (SiO2)

Bumblebee Jasper (Calcite with Arsenic and Sulfur inclusions) — sedimentary

Bumblebee Jasper

Calcite with Arsenic and Sulfur inclusions

Quartzite with Iron Staining (Metamorphosed Quartz-rich Arenite) — metamorphic

Quartzite with Iron Staining

Metamorphosed Quartz-rich Arenite

Quartz Pebble (Silica (SiO2)) — mineral

Quartz Pebble

Silica (SiO2)

Chert Arrowhead (Lithic Artifact) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead (Lithic Artifact)

Microcrystalline Quartz (SiO2)

Fossiliferous Chert (Cryptocrystalline quartz (SiO2) with biogenic inclusions) — sedimentary

Fossiliferous Chert

Cryptocrystalline quartz (SiO2) with biogenic inclusions

Red Jasper with Hematite (Impure Microcrystalline Quartz (SiO2) with Hematite (Fe2O3)) — sedimentary

Red Jasper with Hematite

Impure Microcrystalline Quartz (SiO2) with Hematite (Fe2O3)

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Red Sandstone (Sandstone (Quartz Arenite with Iron Oxide)) — sedimentary

Red Sandstone

Sandstone (Quartz Arenite with Iron Oxide)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

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

Limestone (River Stone)

Calcium Carbonate (CaCO3)

Amethyst (Quartz (Silicon Dioxide with Iron impurities), SiO2) — gemstone

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Red Sandstone (Arenite (Iron-rich)) — sedimentary

Red Sandstone

Arenite (Iron-rich)

Chert (Yellow Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Zebra Jasper (Banded microcrystalline quartz (SiO2)) — sedimentary

Zebra Jasper

Banded microcrystalline quartz (SiO2)

Yellow or Honey Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow or Honey Quartz

Silicon Dioxide (SiO2)

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

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Sandstone (Quartzite-rich Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

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

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Tumbled River Pebble (Quartzite / Agate) (Silicon Dioxide (SiO2)) — sedimentary

Tumbled River Pebble (Quartzite / Agate)

Silicon Dioxide (SiO2)

Clear Quartz Sphere (Crystalline Silicon Dioxide (SiO2)) — mineral

Clear Quartz Sphere

Crystalline Silicon Dioxide (SiO2)

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

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

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

Chert (Jasper/Flint)

Silicon Dioxide (SiO2)

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions

Petrified Wood (Silicified Wood (primarily SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily SiO2)