Rock Identifier

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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.

Chalcedony (Common Opal variant) (Silicon dioxide (SiO2) with varying levels of hydration) — mineral

Chalcedony (Common Opal variant)

Silicon dioxide (SiO2) with varying levels of hydration

Carnelian Agate (Silicon Dioxide (SiO2) with Hematite inclusions) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) with Hematite inclusions

Carnelian (Orange Chalcedony) (Silicon dioxide (SiO2)) — mineral

Carnelian (Orange Chalcedony)

Silicon dioxide (SiO2)

Amethyst (Silicon Dioxide (SiO2) with trace Iron (Fe3+)) — mineral

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

Carnelian (Carnelian (SiO2)) — mineral

Carnelian

Carnelian (SiO2)

Raw Emerald (Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)) — mineral

Raw Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Carnelian Agate (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Serpentine Schist with Quartz Vein (Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).) — Metamorphic

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Anthracite Coal (Anthracite (Carbon)) — metamorphic

Anthracite Coal

Anthracite (Carbon)

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

Herkimer Diamond

Quartz (Silicon Dioxide) - SiO2

Carnelian Agate (Silicon Dioxide (SiO2)) — mineral

Carnelian Agate

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (with Goethite/Limonite cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Goethite/Limonite cement)

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

Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Moss Agate (Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)) — mineral

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)

Obsidian (Volcanic Glass (SiO2 + minor impurities)) — igneous

Obsidian

Volcanic Glass (SiO2 + minor impurities)

Carnelian (Carnelian (SiO2)) — mineral

Carnelian

Carnelian (SiO2)

Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony

Cryptocrystalline Quartz (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Moonstone (Orthoclase Feldspar ((K,Na)AlSi3O8)) — mineral

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Quartz Geode with Goethite/Hematite (Silicon Dioxide (SiO2) with Iron Oxides) — mineral

Quartz Geode with Goethite/Hematite

Silicon Dioxide (SiO2) with Iron Oxides

Serpentine (Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)) — metamorphic

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Yellow Chalcedony (Agate/Jasper mix) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Iron-Nickel Meteorite fragment (Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))) — mineral

Iron-Nickel Meteorite fragment

Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))

Chert (Jasper/Flint variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

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

Chert (Flint)

Silicon Dioxide (SiO2)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Milky Quartz with Iron Inclusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Chert (Flint Pebbles) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Flint Pebbles)

Microcrystalline quartz (SiO2)

Pearl (Calcium Carbonate (primarily Aragonite and Calcite), CaCO3) — mineral

Pearl

Calcium Carbonate (primarily Aragonite and Calcite), CaCO3

Banded Agate (Silicon Dioxide (SiO2)) — mineral

Banded Agate

Silicon Dioxide (SiO2)

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

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Dyed Blue Quartzite (SiO2 (Silicon Dioxide) with artificial colorants) — metamorphic

Dyed Blue Quartzite

SiO2 (Silicon Dioxide) with artificial colorants

Quartzite with vugs/druzy quartz (Crystalline Silicon Dioxide (SiO2)) — metamorphic

Quartzite with vugs/druzy quartz

Crystalline Silicon Dioxide (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartz (River Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Gabbro (Gabbro) — igneous

Gabbro

Gabbro

Banded Carnelian Agate (Var. of Chalcedony (SiO2)) — mineral

Banded Carnelian Agate

Var. of Chalcedony (SiO2)