Rock Identifier

Category

Metamorphic (Altered Igneous Rock)

Browse metamorphic (altered igneous rock) specimens identified by the Rock Identifier community.

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

Vesicular Basalt

Extrusive mafic igneous rock (primarily Plagioclase Feldspar and Pyroxene)

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Pumice (Pumice (Felsic volcanic rock)) — igneous

Pumice

Pumice (Felsic volcanic rock)

Gneiss (specifically Banded Gneiss) (Gneiss) — metamorphic

Gneiss (specifically Banded Gneiss)

Gneiss

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Basalt (Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)

Dalmatian Stone (Dalmation Jasper) (Aplite with Arfvedsonite inclusions) — igneous

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Diorite (Intrusive Igneous Rock (Intermediate Composition)) — igneous

Diorite

Intrusive Igneous Rock (Intermediate Composition)

Basalt (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Crushed Stone (Likely Granite or Diabase) (Intrusive Igneous Rock (Granitoid/Gabbroid)) — igneous

Crushed Stone (Likely Granite or Diabase)

Intrusive Igneous Rock (Granitoid/Gabbroid)

Basalt (River Stone) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (River Stone)

Basalt (Mafic Extrusive Igneous Rock)

River Quartzite (River Rock) (Quartzite (SiO2)) — metamorphic

River Quartzite (River Rock)

Quartzite (SiO2)

Serpentinite (Serpentinite (composed largely of Serpentine minerals such as Lizardite, Antigorite, and Chrysotile: Mg3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed largely of Serpentine minerals such as Lizardite, Antigorite, and Chrysotile: Mg3Si2O5(OH)4)

Quartzite Cobble (Metamorphosed Sandstone (SiO2)) — metamorphic

Quartzite Cobble

Metamorphosed Sandstone (SiO2)

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

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Serpentinite (Serpentinite (composed primarily of Serpentine group minerals usually (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals usually (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

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

Quartzite (River Stone)

Quartzite (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

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

Serpentine

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

Serpentine (Serpentinite) (Antigorite, Lizardite, and Chrysotile: (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine (Serpentinite)

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

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Green Aventurine (Aventurine Quartz (SiO2 with Fuchsite inclusions)) — metamorphic

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Aventurine Quartz (Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)) — metamorphic

Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Quartz Drusy on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Drusy on Matrix

Silicon Dioxide (SiO2)

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

Granite Water-Worn Pebble

Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)

Granodiorite (River Rock / Cobble) (Granodiorite; Phaneritic intrusive igneous rock dominated by plagioclase, quartz, and hornblende/biotite) — igneous

Granodiorite (River Rock / Cobble)

Granodiorite; Phaneritic intrusive igneous rock dominated by plagioclase, quartz, and hornblende/biotite

Vesicular Basalt (Scoria) (Basalt (Vesicular)) — igneous

Vesicular Basalt (Scoria)

Basalt (Vesicular)

Gneiss (Metamorphic Cobble) (Gneiss) — metamorphic

Gneiss (Metamorphic Cobble)

Gneiss

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Orthoclase Feldspar (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Orthoclase Feldspar

Potassium Aluminum Silicate (KAlSi3O8)

Basalt (Mafic volcanic rock) — igneous

Basalt

Mafic volcanic rock

Peridotite (Peridotite (Ultramafic Rock)) — igneous

Peridotite

Peridotite (Ultramafic Rock)

Granite Pebble (Felsic Plutonic Rock) — igneous

Granite Pebble

Felsic Plutonic Rock

Granite (Weathered) (Granitic intrusive rock) — igneous

Granite (Weathered)

Granitic intrusive rock

Peridotite (Peridotite (Ultramafic Rock)) — igneous

Peridotite

Peridotite (Ultramafic Rock)