Rock Identifier

Category

Metamorphic (Altered Igneous Rock)

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

Greenschist (Chlorite schist) — metamorphic

Greenschist

Chlorite schist

Quartz Geode (Silicon Dioxide (SiO2) - Crystalline Quartz) — mineral

Quartz Geode

Silicon Dioxide (SiO2) - Crystalline Quartz

Vesicular Basalt (Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (Scoria)

Vesicular Basalt

Basalt (Vesicular/Amygdaloidal) (Basalt) — igneous

Basalt (Vesicular/Amygdaloidal)

Basalt

Gabbro with Quartz Vein (Gabbro (mafic intrusive igneous rock)) — igneous

Gabbro with Quartz Vein

Gabbro (mafic intrusive igneous rock)

Rhyolite (Rhyolite (felsic extrusive igneous rock)) — igneous

Rhyolite

Rhyolite (felsic extrusive igneous rock)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Mica Schist (Mica Schist (Complex Silicate Rock)) — metamorphic

Mica Schist

Mica Schist (Complex Silicate Rock)

Quartzite (Quartzite (mostly SiO2)) — metamorphic

Quartzite

Quartzite (mostly SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Red Quartzite / Jasper-rich Pebble (Quartzite (primarily SiO2 with hematite inclusions)) — metamorphic

Red Quartzite / Jasper-rich Pebble

Quartzite (primarily SiO2 with hematite inclusions)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Basalt Column Section (Columnar Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt Column Section

Columnar Basalt (Mafic Extrusive Igneous Rock)

Pumice (Pumice (a highly vesicular extrusive igneous rock)) — Igneous

Pumice

Pumice (a highly vesicular extrusive igneous rock)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

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

Basalt Pebble

Basalt (Extrusive Mafic Igneous)

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

Vesicular Basalt

Basalt (Extrusive Mafic Igneous)

Basalt (Basalt (Extrusive Mafic Igneous)) — igneous

Basalt

Basalt (Extrusive Mafic Igneous)

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

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Muscovite Mica (Granitic Pegmatite) (Muscovite - KAl2(AlSi3O10)(OH)2) — mineral

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Quartzite with Iron Inclusions (Metamorphosed Sandstone (SiO2 dominated)) — metamorphic

Quartzite with Iron Inclusions

Metamorphosed Sandstone (SiO2 dominated)

Pink Granite (Granite (Felsic intrusive igneous rock)) — igneous

Pink Granite

Granite (Felsic intrusive igneous rock)

Gabbro (Phaneritic mafic intrusive igneous rock) — igneous

Gabbro

Phaneritic mafic intrusive igneous rock

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

Granite River Pebble

Phaneritic Felsic Igneous Rock (Granite)

Granite (Granite (Felsic Intrusive Igneous Rock)) — igneous

Granite

Granite (Felsic Intrusive Igneous Rock)

Granodiorite (Granodiorite (phaneritic intrusive igneous rock)) — igneous

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Granite (Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)) — igneous

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Greenstone (Metabasalt (often contains Chlorite, Actinolite, and Epidote)) — metamorphic

Greenstone

Metabasalt (often contains Chlorite, Actinolite, and Epidote)

Greenstone (Metabasalt / Chlorite-Epidote Schist) — metamorphic

Greenstone

Metabasalt / Chlorite-Epidote Schist

Gneiss (specifically Banded Gneiss) (Gneiss) — metamorphic

Gneiss (specifically Banded Gneiss)

Gneiss

Greenstone (Greenschist / Meta-basalt) — metamorphic

Greenstone

Greenschist / Meta-basalt

Dragon Stone (Dragon Blood Jasper) (Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))) — metamorphic

Dragon Stone (Dragon Blood Jasper)

Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))

Greenschist / Chloritaform Schist (Chlorite Schist (Group of Silicate Minerals)) — metamorphic

Greenschist / Chloritaform Schist

Chlorite Schist (Group of Silicate Minerals)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite with Chert inclusions (Metamorphosed Quartz-rich Rock (SiO2)) — metamorphic

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)