Rock Identifier

Category

Mineral Based Alloy (Anthropogenic)

Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.

Polygenetic Breccia (Clastic Breccia (containing lithic fragments in a fine-grained matrix)) — sedimentary

Polygenetic Breccia

Clastic Breccia (containing lithic fragments in a fine-grained matrix)

Snowflake Obsidian (Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)

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

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Stichtite in Serpentine (Atlantisite) (Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)) — metamorphic

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Epidotite (Unakite variety) (Epidotized Granite (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))) — metamorphic

Epidotite (Unakite variety)

Epidotized Granite (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Anthracite Coal (Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)) — metamorphic

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

Basalt (Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Crushed Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Crushed Limestone

Calcium Carbonate (CaCO3)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) (Porphyritic Basalt (primarily Plagioclase Feldspar, Pyroxene, and Olivine)) — igneous

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (primarily Plagioclase Feldspar, Pyroxene, and Olivine)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Greywacke with Quartz Vein (Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)) — sedimentary

Greywacke with Quartz Vein

Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)

Basalt (Beach Pebble) (Extrusive mafic volcanic rock) — igneous

Basalt (Beach Pebble)

Extrusive mafic volcanic rock

Diabase (Greenstone) (Diabase (also known as Dolerite)) — igneous

Diabase (Greenstone)

Diabase (also known as Dolerite)

Basalt (Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)) — igneous

Basalt

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Arkosic Sandstone (Arkose) — sedimentary

Arkosic Sandstone

Arkose

Sandstone (Arenite (primarily Quartz SiO2)) — sedimentary

Sandstone

Arenite (primarily Quartz SiO2)

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

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

Greywacke (River Pebble)

Greywacke (Indurated Sandstone)

Fossiliferous Limestone with Rugose Coral (Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)) — sedimentary

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Basalt (Beach Pebble) (Extrusive mafic igneous rock) — igneous

Basalt (Beach Pebble)

Extrusive mafic igneous rock

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Basalt (Vesicular or Scoriaceous) (Aphanitic Mafic Volcanic Rock) — igneous

Basalt (Vesicular or Scoriaceous)

Aphanitic Mafic Volcanic Rock

Basalt (Basalt) — igneous

Basalt

Basalt

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

Vesicular Basalt

Basalt (Extrusive Igneous Rock)

Basalt (Basalt (containing Pyroxene, Plagioclase feldspar, and Olivine)) — igneous

Basalt

Basalt (containing Pyroxene, Plagioclase feldspar, and Olivine)

Basalt Pebble (Basalt (Extrusive Mafic Igneous)) — igneous

Basalt Pebble

Basalt (Extrusive Mafic Igneous)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Vesicular Basalt (Extrusive mafic igneous rock) — igneous

Vesicular Basalt

Extrusive mafic igneous rock

Graywacke (Graywacke/Lithic Sandstone) — sedimentary

Graywacke

Graywacke/Lithic Sandstone

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Granite (Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)

Vesicular Basalt (Extrusive mafic igneous rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Vesicular Basalt

Extrusive mafic igneous rock (primarily Plagioclase Feldspar and Pyroxene)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Chert Breccia (Brecciated Microcrystalline Quartz (SiO2)) — sedimentary

Chert Breccia

Brecciated Microcrystalline Quartz (SiO2)

Basalt (Vesicular/Scoriaceous) (Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)) — Igneous

Basalt (Vesicular/Scoriaceous)

Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Basalt with inclusion (Basalt (Aphanitic-Porphyritic texture)) — igneous

Basalt with inclusion

Basalt (Aphanitic-Porphyritic texture)

Fossiliferous Limestone (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Andesite Porphyry (Porphyritic Andesite) — igneous

Andesite Porphyry

Porphyritic Andesite

Limestone with Algal/Lichen Colonization (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Algal/Lichen Colonization

Calcium Carbonate (CaCO3)