Rock Identifier

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All rocks & minerals

Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.

Explore the rock & mineral encyclopedia

Acanthite

Achroite

Adinole

Adirondack Garnet

Adirondack Garnet

Adularia

Agate

Albite

Albitite

Alexandrite

Alkali Feldspar

Alkali Feldspar

Almandine Garnet

Almandine Garnet

Alnöite

Flint Pebble (Sedimentary cryptocrystalline quartz (SiO2)) — sedimentary

Flint Pebble

Sedimentary cryptocrystalline quartz (SiO2)

Quartzite Pebble (Metamorphosed Quartz Arenite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Arenite (SiO2)

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartzite with Quartz Vein (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite with Quartz Vein

Metamorphic Quartzite (SiO2)

Red Jasper (Silicon Dioxide (Microcrystalline Quartz), SiO2) — sedimentary

Red Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Flint (SiO2 (Cryptocrystalline Quartz)) — sedimentary

Flint

SiO2 (Cryptocrystalline Quartz)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble) (Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)

Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Flint

SiO2 (Cryptocrystalline Quartz / Chert)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Vein-filled Basalt or Diabase Pebble (Mafic igneous rock with quartz/calcite veins) — igneous

Vein-filled Basalt or Diabase Pebble

Mafic igneous rock with quartz/calcite veins

Flint (Silicon dioxide (SiO2) microcrystalline quartz) — sedimentary

Flint

Silicon dioxide (SiO2) microcrystalline quartz

Flint Pebble (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Flint Pebble

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Flint Pebble (Silicon Dioxide (Microcrystalline Quartz / Chert)) — sedimentary

Flint Pebble

Silicon Dioxide (Microcrystalline Quartz / Chert)

Sandstone (Sedimentary Rock (Quartz arenite / Lithic sandstone)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite / Lithic sandstone)

River Rock (Silica-rich water-worn rock) — sedimentary

River Rock

Silica-rich water-worn rock

Granite (Granite) — igneous

Granite

Granite

Sandstone (Sedimentary Rock (Quartz arenite/Arkosic sandstone)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite/Arkosic sandstone)

Quartz-veined Basalt or Limestone Pebble (Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)) — sedimentary

Quartz-veined Basalt or Limestone Pebble

Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)

Quartzite Pebble (Metamorphic Quartzite) — metamorphic

Quartzite Pebble

Metamorphic Quartzite

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Sandstone (Quartzose Sandstone (Sedimentary Rock)) — sedimentary

Sandstone

Quartzose Sandstone (Sedimentary Rock)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Quartzite (Metamorphosed Quartz Sandstone / Quartzite) — metamorphic

Banded Quartzite

Metamorphosed Quartz Sandstone / Quartzite

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Amethyst Cluster (Silicon Dioxide (Quartz variety), SiO2) — mineral

Amethyst Cluster

Silicon Dioxide (Quartz variety), SiO2

Yellow Agate (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Yellow Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Flint (or Chert)

Microcrystalline quartz (SiO2)

Fossilized Oyster in Flint (Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)) — fossil

Fossilized Oyster in Flint

Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)

Limonite with Quartz (Hydrated Iron Oxide Hydroxide, FeO(OH)·nH₂O with SiO₂) — mineral

Limonite with Quartz

Hydrated Iron Oxide Hydroxide, FeO(OH)·nH₂O with SiO₂

Limestone with Calcite Veining (Sedimentary Rock (Calcium Carbonate, CaCO3)) — sedimentary

Limestone with Calcite Veining

Sedimentary Rock (Calcium Carbonate, CaCO3)

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

Chert / Flint

Microcrystalline Quartz (SiO2)

Hag Stone (Perforated sedimentary rock (typically flint, chert, or limestone)) — sedimentary

Hag Stone

Perforated sedimentary rock (typically flint, chert, or limestone)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)