Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Red Jasper (River Smooth) (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper (River Smooth)

Silicon Dioxide (SiO2) with Hematite impurities

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

Chert (Arrowhead/Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Grey Basalt or Andesite with Veining (Intermediate to Mafic Extrusive Igneous Rock with Quartz/Calcite Veins) — igneous

Grey Basalt or Andesite with Veining

Intermediate to Mafic Extrusive Igneous Rock with Quartz/Calcite Veins

Howlite (dyed) (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite (dyed)

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Banded Chert (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Sedimentary Cryptocrystalline Quartz (SiO2)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Chert Pebble (with fossil shell fragment) (Microcrystalline Quartz (SiO2) with Calcified Invertebrate Impression) — sedimentary

Chert Pebble (with fossil shell fragment)

Microcrystalline Quartz (SiO2) with Calcified Invertebrate Impression

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

Chert

Chert (Microcrystalline Quartz, SiO2)

Yellow Chert (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chert

Silicon Dioxide (SiO2)

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

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Banded Quartzite (Quartzite (principally SiO2)) — metamorphic

Banded Quartzite

Quartzite (principally SiO2)

Chert Nodule in Limestone (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule in Limestone

Microcrystalline Quartz (SiO2)

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

Clear Quartz Crystal

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

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

Chert (Flint Pepple)

Microcrystalline Quartz (SiO2)

Concretion (Calcareous/Siliceous Concretion) — sedimentary

Concretion

Calcareous/Siliceous Concretion

Yellow Chert (River Pebble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Yellow Chert (River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint nodules in Limestone) (Silicon dioxide (SiO2)) — sedimentary

Chert (Flint nodules in Limestone)

Silicon dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz (Herkimer Diamond variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Herkimer Diamond variant)

Silicon Dioxide (SiO2)

Herkimer Diamond (Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chert (variations include Flint or Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chevron Amethyst (Silicon Dioxide (SiO2) with Fe3+ impurities) — gemstone

Chevron Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

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

Banded Chert

Chert (Silicon Dioxide, SiO2)

Chert with Fossil Brachiopod (Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion) — sedimentary

Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Moqui Marble (Shaman Stone) (Iron Oxide Concretion (Hematite/Goethite)) — sedimentary

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Hematite/Goethite)

Amethyst (Faceted) (Silicon Dioxide with iron impurities (SiO2)) — gemstone

Amethyst (Faceted)

Silicon Dioxide with iron impurities (SiO2)

Red Jasper (Oolitic Hematite) (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities) — mineral

Red Jasper (Oolitic Hematite)

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

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon dioxide (SiO2) with iron impurities

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

Amethyst

Quartz (Silicon Dioxide with Iron impurities, SiO2)

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

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Quartz (Small Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic or Ferruginous) (Arenite (SiO2 with iron oxides or feldspar)) — sedimentary

Sandstone (likely Arkosic or Ferruginous)

Arenite (SiO2 with iron oxides or feldspar)

Amethyst (Amethyst (Silicon Dioxide, SiO2 + Fe4+)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe4+)

Yellow Jasper (Silicon Dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

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

Citrine

Silicon Dioxide with iron impurities (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)