Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Learn about Mineralogical Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Morganite Crystal

Morganite Crystal

Aquamarine Matrix

Aquamarine Matrix

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

White Beryl

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Sandstone (Quartzite-rich) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

River Stone/Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

River Stone/Chert Pebble

Microcrystalline Quartz (SiO2)

Granite Pebble (Phaneritic Felsic Igneous Rock) — igneous

Granite Pebble

Phaneritic Felsic Igneous Rock

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Chert Arrowhead (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Granite River Pebble (Granite (Felsic Plutonic Rock)) — igneous

Granite River Pebble

Granite (Felsic Plutonic Rock)

Dyed Agate Geode (Silicon Dioxide (SiO2) - Chalcedony variety) — mineral

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Sandstone (Quartzose Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Gray Limestone (Carbonate rock (CaCO3)) — sedimentary

Gray Limestone

Carbonate rock (CaCO3)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone) (Sandstone (SiO2 with various trace minerals)) — sedimentary

Sandstone (Quartzose Sandstone)

Sandstone (SiO2 with various trace minerals)

Quartzite (River Stone) (Quartzite (predominantly SiO2)) — metamorphic

Quartzite (River Stone)

Quartzite (predominantly SiO2)

Sandstone (Beach Pebble) (Clastic sedimentary rock (primarily Quartz and Feldspar)) — sedimentary

Sandstone (Beach Pebble)

Clastic sedimentary rock (primarily Quartz and Feldspar)

Basalt (with Iron Staining) (Mafic Igneous Rock) — igneous

Basalt (with Iron Staining)

Mafic Igneous Rock

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

Granite (River Cobble)

Phaneritic Plutonic Felsic Rock (Granite)

Limestone (specifically Chalky Limestone) (Calcium Carbonate (CaCO3 / Calcite)) — sedimentary

Limestone (specifically Chalky Limestone)

Calcium Carbonate (CaCO3 / Calcite)

Granite Pebble (Granite (Phaneritic intrusive rock)) — igneous

Granite Pebble

Granite (Phaneritic intrusive rock)

Granite Cobble (Granite (composed primarily of Quartz, Feldspar, and Mica)) — igneous

Granite Cobble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chert / Jasper (Silicon Dioxide (SiO2)) — sedimentary

Chert / Jasper

Silicon Dioxide (SiO2)

Pink Granite (Phaneritic Coarse-Grained Granite) — igneous

Pink Granite

Phaneritic Coarse-Grained Granite

Quartzite Pebble (Metamorphosed Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Sandstone (SiO2)

Milky Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Pink Granite (Water-worn Cobble) (Granite (Alkali-feldspar granite)) — igneous

Pink Granite (Water-worn Cobble)

Granite (Alkali-feldspar granite)

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

White Quartz Pebble

Silicon Dioxide (SiO2)

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

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Quartzite Pebble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Pebble

Quartzite (mostly SiO2)

Crushed Limestone Aggregate (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Crushed Limestone Aggregate

Limestone (Calcium Carbonate, CaCO3)

Granite Pebble (Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)) — igneous

Granite Pebble

Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)

Quartzite Pebble (Quartzite (Silicon Dioxide: SiO2)) — metamorphic

Quartzite Pebble

Quartzite (Silicon Dioxide: SiO2)

Quartzite (with Iron Staining) (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite (with Iron Staining)

Metamorphic Quartzite (SiO2)

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

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Granite Pebble (Phaneritic Felsic Igneous Rock) — igneous

Granite Pebble

Phaneritic Felsic Igneous Rock

Granite (Phaneritic intrusive igneous rock) — igneous

Granite

Phaneritic intrusive igneous rock

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony (Agate/Carnelian) (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony (Agate/Carnelian)

Cryptocrystalline Quartz (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chert Arrowhead (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)