Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Obsidian (Volcanic Glass (SiO2 rich)) — igneous

Obsidian

Volcanic Glass (SiO2 rich)

Cullet (Slag Glass) (Amorphous Silica (SiO2) with various metal oxide colorants) — mineraloid / anthropogenic

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

mineraloid / anthropogenic

Note: The image provided is a fabric sock, not a geological specimen. (Polyester-Cotton Blend with Elastane) — Synthetic/Natural Fiber (Non-Geological)

Note: The image provided is a fabric sock, not a geological specimen.

Polyester-Cotton Blend with Elastane

Synthetic/Natural Fiber (Non-Geological)

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

Chert (Flint/Chalcedony)

Silicon Dioxide (SiO2)

Fire Opal (Common/Precious in Matrix) (Hydrated Silica (SiO2·nH2O)) — mineral

Fire Opal (Common/Precious in Matrix)

Hydrated Silica (SiO2·nH2O)

Black Onyx or Dyed Agate Node (Cryptocrystalline Quartz (SiO2)) — mineral

Black Onyx or Dyed Agate Node

Cryptocrystalline Quartz (SiO2)

Anthracite Coal (Anthracite (high-rank coal / Carbon)) — metamorphic

Anthracite Coal

Anthracite (high-rank coal / Carbon)

Obsidian (Obsidian (volcanic glass), predominantly Silicon Dioxide (SiO2)) — igneous

Obsidian

Obsidian (volcanic glass), predominantly Silicon Dioxide (SiO2)

Chert (often called Jasper or Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (often called Jasper or Flint)

Silicon Dioxide (SiO2)

Druzy Chalcedony (Agate Geode) (Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz) — mineral

Druzy Chalcedony (Agate Geode)

Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz

Quartzite Arrowhead (Archaeological Lithic) (Recrystallized Quartz (SiO2)) — metamorphic

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Zebra Stone (Banded Chert or Limestone) (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions) — sedimentary

Zebra Stone (Banded Chert or Limestone)

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Tangerine Quartz (Silicon Dioxide (SiO2) with Hematite/Limonite coatings) — mineral

Tangerine Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite coatings

Chert (River Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (River Pebble)

Silicon Dioxide (SiO2)

Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — mineral

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Tumbled chalcedony (likely pale agate or common opal) (Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal) — mineral

Tumbled chalcedony (likely pale agate or common opal)

Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal

Weathered iron-rich rock, likely ironstone or limonite-bearing concretion (Ironstone/limonite-rich concretion; mainly goethite FeO(OH), hematite Fe₂O₃, and hydrated iron oxides) — sedimentary

Weathered iron-rich rock, likely ironstone or limonite-bearing concretion

Ironstone/limonite-rich concretion; mainly goethite FeO(OH), hematite Fe₂O₃, and hydrated iron oxides

Rhodonite-bearing metamorphic rock (Rhodonite (MnSiO₃) in manganese-rich schist/gneiss, possibly with quartz and amphibole) — metamorphic

Rhodonite-bearing metamorphic rock

Rhodonite (MnSiO₃) in manganese-rich schist/gneiss, possibly with quartz and amphibole

Rounded dark volcanic rock, likely basalt (Basalt; fine-grained plagioclase–pyroxene rock, commonly with olivine and magnetite) — igneous

Rounded dark volcanic rock, likely basalt

Basalt; fine-grained plagioclase–pyroxene rock, commonly with olivine and magnetite

Pink sandstone (Quartz-rich siliciclastic sandstone, likely arkose or subarkose) — sedimentary

Pink sandstone

Quartz-rich siliciclastic sandstone, likely arkose or subarkose

Shungite (Non-crystalline carbonoid (Shungite)) — metamorphic

Shungite

Non-crystalline carbonoid (Shungite)

Conglomerate (Conglomerate (Detrital sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (Detrital sedimentary rock)

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Sapphire (Corundum (Al2O3)) — mineral

Sapphire

Corundum (Al2O3)

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Synthetic Costume Accessory (Non-Geological) (Polyester and Acrylic Fiber (Anthropogenic polymer)) — Synthetic / Man-made textile

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Synthetic / Man-made textile

Obsidian (Amorphous Volcanic Glass (primarily SiO2)) — igneous

Obsidian

Amorphous Volcanic Glass (primarily SiO2)

Obsidian (Black Obsidian) (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian (Black Obsidian)

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Orbicular Jasper (Silicon Dioxide (SiO2)) — sedimentary

Orbicular Jasper

Silicon Dioxide (SiO2)

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

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Ametrine (Ametrine (SiO2 - Silicon Dioxide with varied iron impurities)) — mineral

Ametrine

Ametrine (SiO2 - Silicon Dioxide with varied iron impurities)

Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone) (White River Group (Brule and Chadron Formations)) — sedimentary

Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone)

White River Group (Brule and Chadron Formations)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Weathered sandstone (Quartz-rich sandstone, likely ferruginous arkose or subarkose) — sedimentary

Weathered sandstone

Quartz-rich sandstone, likely ferruginous arkose or subarkose

Dark river-worn stone, likely basalt (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene) — igneous

Dark river-worn stone, likely basalt

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene

Weathered sandstone (Quartz-rich sandstone, chiefly SiO₂ with feldspar and lithic grains) — sedimentary

Weathered sandstone

Quartz-rich sandstone, chiefly SiO₂ with feldspar and lithic grains

Weathered sandstone or siltstone (Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by clay, silica, or iron oxides) — sedimentary

Weathered sandstone or siltstone

Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by clay, silica, or iron oxides

Green Quartz / Aventurine (Silicon Dioxide (SiO2) with inclusions) — Metamorphic

Green Quartz / Aventurine

Silicon Dioxide (SiO2) with inclusions

Slag (Anthropogenic glassy silicate) — Mineral-like byproduct

Slag

Anthropogenic glassy silicate

Mineral-like byproduct

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — Igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Apache Tears (Obsidian) (Volcanic Glass (SiO2)) — igneous

Apache Tears (Obsidian)

Volcanic Glass (SiO2)