Rock Identifier

Category

Mineral, Often A Rock Given Its Aggregate Nature

Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.

Amygdaloidal Basalt (Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Granite (Course-grained intrusive igneous rock) — igneous

Granite

Course-grained intrusive igneous rock

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

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite (River Pebble) (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

$Sandstone (with prominent jointing/fractures) (Arenite (composed primarily of SiO2)) — sedimentary$

Sandstone (with prominent jointing/fractures)

Arenite (composed primarily of SiO2)

Graphite (Graphite (C)) — mineral

Graphite

Graphite (C)

Quartzite (Quartzite (primarily Silicon Dioxide, SiO2)) — metamorphic

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Man-made Ceramic / Clay Figurine (Aluminosilicate Ceramic (Processed Clay)) — Synthetic (not a rock or mineral)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Synthetic (not a rock or mineral)

Quartz (Fieldstone/Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Sandstone or Limestone (Arenite or Calcareous Sedimentary Rock) — Sedimentary

Sandstone or Limestone

Arenite or Calcareous Sedimentary Rock

Granite Pebble (Weathered) (Phaneritic Felsic Igneous Rock) — igneous

Granite Pebble (Weathered)

Phaneritic Felsic Igneous Rock

Goldstone (Aventurine glass (Synthetic glass with copper inclusions)) — mineraloid / man-made glass

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

mineraloid / man-made glass

Basalt River Stone (Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)) — igneous

Basalt River Stone

Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Ferruginous Sandstone (Ironstone) (Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)) — sedimentary

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Grey Limestone Pebble (Limestone (Calcium Carbonate - CaCO3)) — sedimentary

Grey Limestone Pebble

Limestone (Calcium Carbonate - CaCO3)

Stilbite (Stilbite-Ca (Hydrated calcium sodium aluminum silicate), NaCa4(Si27Al9)O72·28H2O) — mineral

Stilbite

Stilbite-Ca (Hydrated calcium sodium aluminum silicate), NaCa4(Si27Al9)O72·28H2O

Granite (weathered/river-tumbled) (Granite (Plutonic Igneous Rock)) — Igneous Rock

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Howlite (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Felsic Igneous Rock (likely Rhyolite or weathered Granite) (Felsic Volcanic/Plutonic Rock) — igneous

Felsic Igneous Rock (likely Rhyolite or weathered Granite)

Felsic Volcanic/Plutonic Rock

Red Jasper (Poppy Jasper variety) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper (Poppy Jasper variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Graywacke (Graywacke) — sedimentary

Graywacke

Graywacke

Black Tourmaline (Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4) — mineral

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Basalt (Road Gravel) (Aphanitic mafic volcanic rock (various compositions of plagioclase feldspar and pyroxene)) — igneous

Basalt (Road Gravel)

Aphanitic mafic volcanic rock (various compositions of plagioclase feldspar and pyroxene)

Conglomerate (Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Chalk (Sedimentary Pebble) (Calcium Carbonate (CaCO3) - Biogenic Limestone) — sedimentary

Chalk (Sedimentary Pebble)

Calcium Carbonate (CaCO3) - Biogenic Limestone

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

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Coquina (Bioclastic Limestone (composed primarily of CaCO3)) — sedimentary

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Amphibolite (Amphibolite) — metamorphic

Amphibolite

Amphibolite

Gneiss (Foliated Metamorphic Rock (Gneiss)) — metamorphic

Gneiss

Foliated Metamorphic Rock (Gneiss)

Greenschist (Chlorite-actinolite schist) — metamorphic

Greenschist

Chlorite-actinolite schist

Basalt (Vesicular) (Basalt (Extrusive Volcanic Rock)) — igneous

Basalt (Vesicular)

Basalt (Extrusive Volcanic Rock)

Scoria (Lava Rock) (Scoria (vesicular basaltic rock)) — igneous

Scoria (Lava Rock)

Scoria (vesicular basaltic rock)

Conglomerate (Conglomerate (Sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (Sedimentary rock)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions