Rock Identifier

Category

Rock

Browse rock specimens identified by the Rock Identifier community.

Learn about Rock in the encyclopedia

Rock Gypsum

Coral Rock

Asphalt Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Anorthosite

Cataclasite

Peridotite

Phosphorite

Gondite

Dunite

River Pebble (Greywacke / Sandstone Pebble) (Indurated Sandstone / Greywacke Pebble) — sedimentary

River Pebble (Greywacke / Sandstone Pebble)

Indurated Sandstone / Greywacke Pebble

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone) (Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)) — mineral

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Clear Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz / Clear Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Basalt River Cobble (Basalt (Aphanitic extrusive mafic igneous rock)) — igneous

Basalt River Cobble

Basalt (Aphanitic extrusive mafic igneous rock)

Basalt with Epidote (Porphyritic Basalt) (Mafic Porphyritic Basalt with (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) inclusions) — igneous

Basalt with Epidote (Porphyritic Basalt)

Mafic Porphyritic Basalt with (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) inclusions

Sandstone (Arenite (Siliclastic sedimentary rock)) — sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock)

Granite Cobble (Granite (Felsic Plutonic Rock)) — igneous

Granite Cobble

Granite (Felsic Plutonic Rock)

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Chalcedony (Agate / Quartz Beach Pebble) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate / Quartz Beach Pebble)

Silicon Dioxide (SiO2)

Grey Agate (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Grey Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite Glacial Cobble (Granite) — igneous

Granite Glacial Cobble

Granite

Agate (Polished Slice) (Silicon Dioxide (SiO2)) — mineral

Agate (Polished Slice)

Silicon Dioxide (SiO2)

Banded Agate (Lake Superior Agate) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Banded Agate (Lake Superior Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Beach Pebbles and Jasper (Quartz / Microcrystalline Silicon Dioxide (SiO2)) — sedimentary

Beach Pebbles and Jasper

Quartz / Microcrystalline Silicon Dioxide (SiO2)

Agate / Chalcedony Pebble (Silicon Dioxide (SiO2)) — mineral

Agate / Chalcedony Pebble

Silicon Dioxide (SiO2)

Siltstone (Yellow/Brown Sandstone or Siltstone) (Siltstone / Fine-grained Sandstone (rich in iron oxides like limonite)) — sedimentary

Siltstone (Yellow/Brown Sandstone or Siltstone)

Siltstone / Fine-grained Sandstone (rich in iron oxides like limonite)

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

Red Jasper

SiO2 (Silicon Dioxide with Hematite inclusions)

Beach Agate / Chalcedony Pebble (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Beach Agate / Chalcedony Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Rhyolite (Wonderstone) (Rhyolite (High-silica volcanic rock)) — igneous

Banded Rhyolite (Wonderstone)

Rhyolite (High-silica volcanic rock)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Quartzite Pebble (Meta-quartzite (SiO2)) — metamorphic

Quartzite Pebble

Meta-quartzite (SiO2)

Limestone (Elephant Skin or Karst-weathered) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Elephant Skin or Karst-weathered)

Calcium Carbonate (CaCO3)

Pyritic Gneiss (with Garnet) (Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)) — metamorphic

Pyritic Gneiss (with Garnet)

Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)

Green Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Brachiopod Fossil (Brachiopoda (Phylum); often Atrypa or Mucrospirifer genus depending on locality) — fossil

Brachiopod Fossil

Brachiopoda (Phylum); often Atrypa or Mucrospirifer genus depending on locality

Septarian Nodule (Septaria (composed of Calcite, Aragonite, and Limestone)) — sedimentary

Septarian Nodule

Septaria (composed of Calcite, Aragonite, and Limestone)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Jasper with Quartz Veining (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with Hematite impurities

Quartzite with Quartz Veining (Quartzite (primarily SiO2)) — metamorphic

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Snowflake Obsidian (Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)) — igneous

Snowflake Obsidian

Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)

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

Red Jasper (with Hematite inclusions)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Quartzite River Pebble (Quartzite (SiO2)) — metamorphic

Quartzite River Pebble

Quartzite (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Common Opal variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal variant)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)