Rock Identifier

Category

Metamorphic (Likely Gneiss Or Schist Based On Texture)

Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.

Sandstone (Weathered Pebble) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Chert Breccia (Brecciated Chert (SiO2)) — sedimentary

Chert Breccia

Brecciated Chert (SiO2)

Epidote (Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) — mineral

Epidote

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Ferruginous Sandstone (Ironstone Conglomerate fragments) (Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)) — sedimentary

Ferruginous Sandstone (Ironstone Conglomerate fragments)

Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)

Sandstone (likely Calcareous or Micaceous) (Clastic sedimentary rock (primarily Quartz with Cementing Agents)) — sedimentary

Sandstone (likely Calcareous or Micaceous)

Clastic sedimentary rock (primarily Quartz with Cementing Agents)

Serpentine (Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)) — metamorphic

Serpentine

Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Shale (with Iron Oxide staining) (Fissile Mudstone (primarily Quartz and Clay minerals)) — sedimentary

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Yellow Quartzite (Silicon Dioxide (SiO2)) — metamorphic

Yellow Quartzite

Silicon Dioxide (SiO2)

Sandstone (Glacial Cobble) (Arenite / Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Milky Quartz (Water-worn Pebble) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Basalt (Basalt (Mafic volcanic rock)) — Igneous

Basalt

Basalt (Mafic volcanic rock)

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Emerald (Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities) — mineral

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide)) — mineral

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Granodiorite (Phaneritic intrusive igneous rock (Granodiorite)) — igneous

Granodiorite

Phaneritic intrusive igneous rock (Granodiorite)

Quartzite (Rounded Pebble) (Quartzite (predominantly SiO2)) — metamorphic

Quartzite (Rounded Pebble)

Quartzite (predominantly SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Basalt (Basalt) — igneous

Basalt

Basalt

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

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Shale or Slaty Mudstone (Argillaceous sedimentary rock) — sedimentary

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Quartzite Cobble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Metamorphic Quartzite (SiO2)

Sandstone (Iron-stained) (Clastic sedimentary rock (SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Red Jasper (River Polished Quartzite) (Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities) — sedimentary

Red Jasper (River Polished Quartzite)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities

River Siltstone / Mudstone Pebble (Siltstone (composed of mixed silicate and carbonate minerals)) — sedimentary

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)

Basalt (Basalt) — igneous

Basalt

Basalt

Man-made Slag (Industrial Byproduct) (Anthropogenic Glassy Residue) — not a natural rock

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

not a natural rock

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Vesicular Basalt (Scoria) (Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)) — Igneous

Vesicular Basalt (Scoria)

Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)

Coquina (Biogenic Limestone (Calcite/Aragonite)) — sedimentary

Coquina

Biogenic Limestone (Calcite/Aragonite)

Quartzite (SiO2 (Silicon Dioxide)) — metamorphic

Quartzite

SiO2 (Silicon Dioxide)

Basalt (Weathered) (Extrusive Igneous Rock (Mafic composition)) — igneous

Basalt (Weathered)

Extrusive Igneous Rock (Mafic composition)

Sandstone (Ferruginous) (Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)) — sedimentary

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Serpentine (Antigorite, Lizardite, or Chrysotile (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe)3Si2O5(OH)4

Quartzite (or Milky Quartz pebble) (Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)) — metamorphic

Quartzite (or Milky Quartz pebble)

Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Andesite (Andesite (contains Plagioclase feldspar, Pyroxene, Hornblende)) — igneous

Andesite

Andesite (contains Plagioclase feldspar, Pyroxene, Hornblende)

Basalt with Quartz Veining (Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)) — igneous

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)