Rock Identifier

Category

Metamorphic (Altered Igneous Rock)

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

Learn about Metamorphic (Altered Igneous Rock) in the encyclopedia

Rock Gypsum

Coral Rock

Asphalt Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Metabasalt

Metarhyolite

Metagabbro

Diabase

Carbonatite

Greenstone

Raw Calcite (Calcium Carbonate (CaCO3)) — mineral

Raw Calcite

Calcium Carbonate (CaCO3)

Fuchsite (Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Rounded gray stone, likely basalt or andesite (Fine-grained mafic to intermediate volcanic rock; likely basalt (plagioclase ± pyroxene, possibly olivine)) — igneous

Rounded gray stone, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; likely basalt (plagioclase ± pyroxene, possibly olivine)

Weathered copper-bearing rock, likely chrysocolla/azurite-malachite ore (Copper carbonate–silicate mineral assemblage; probable malachite (Cu2CO3(OH)2) with chrysocolla (Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O), possibly limonite and azurite) — mineral

Weathered copper-bearing rock, likely chrysocolla/azurite-malachite ore

Copper carbonate–silicate mineral assemblage; probable malachite (Cu2CO3(OH)2) with chrysocolla (Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O), possibly limonite and azurite

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Milky quartz (iron-stained quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Gneiss (Gneissic Metamorphic Rock) — metamorphic

Gneiss

Gneissic Metamorphic Rock

Faceted Clear Quartz or Diamond Simulant (Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic) — gemstone

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Granite-like granitic rock (Crystalline plutonic rock, primarily quartz, feldspar, and mica/amphibole) — igneous

Granite-like granitic rock

Crystalline plutonic rock, primarily quartz, feldspar, and mica/amphibole

Banded Gneiss (Metamorphic Gneiss) — metamorphic

Banded Gneiss

Metamorphic Gneiss

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Turquoise (Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)) — mineral

Turquoise

Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)

Likely weathered gneiss or mica-rich schist (Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist) — metamorphic

Likely weathered gneiss or mica-rich schist

Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist

Unakit (Epidotized Granite) — metamorphic

Unakit

Epidotized Granite

Serpentinite (likely antigorite-rich) (Serpentinite; hydrated Mg-rich silicate minerals, chiefly antigorite (Mg3Si2O5(OH)4), with possible chrysotile/lizardite and magnetite) — metamorphic

Serpentinite (likely antigorite-rich)

Serpentinite; hydrated Mg-rich silicate minerals, chiefly antigorite (Mg3Si2O5(OH)4), with possible chrysotile/lizardite and magnetite

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

Serpentine (Serpentinite)

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

Quartz-veined Metamorphic Pebble (Silicate-rich metamorphic rock with quartz veins (SiO2)) — metamorphic

Quartz-veined Metamorphic Pebble

Silicate-rich metamorphic rock with quartz veins (SiO2)

Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (Metamorphic Rock)

Gneiss (Gneiss (Metamorphic rock)) — metamorphic

Gneiss

Gneiss (Metamorphic rock)

Gneiss (Foliated Metamorphic Rock) — metamorphic

Gneiss

Foliated Metamorphic Rock

Gneiss (Gneissic Metamorphic Rock) — metamorphic

Gneiss

Gneissic Metamorphic Rock

Serpentinite (likely serpentine-rich metamorphic rock) (Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly derived from altered peridotite) — metamorphic

Serpentinite (likely serpentine-rich metamorphic rock)

Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly derived from altered peridotite

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (Metamorphic Rock)

Gneiss (with Mica and Quartz) (Gneissic Metamorphic Rock) — metamorphic

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Gneiss (Metamorphic Gneiss) — metamorphic

Gneiss

Metamorphic Gneiss

Quartz Vein in Host Rock (Silicon Dioxide (SiO2) vein cutting through host rock) — mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) vein cutting through host rock

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with Mica/Host Rock (Silicon Dioxide (SiO2) with Phyllosilicates) — mineral

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Tiger's Eye (Quartz pseudomorph after crocidolite (SiO2)) — gemstone

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Tumbled dark green stone, likely greenstone/serpentinite (Serpentinite (serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄), possibly chlorite-rich greenstone) — metamorphic

Tumbled dark green stone, likely greenstone/serpentinite

Serpentinite (serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄), possibly chlorite-rich greenstone

Lapis Lazuli (Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)) — metamorphic

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)

Quartz Pebble (with Feldspar/Mica) (Granitic Quartz / SiO2 with KAlSi3O8) — igneous

Quartz Pebble (with Feldspar/Mica)

Granitic Quartz / SiO2 with KAlSi3O8

Gneiss and Igneous Rock Collection (Foliated Metamorphic Rock (Gneiss) / Igneous Rocks) — metamorphic

Gneiss and Igneous Rock Collection

Foliated Metamorphic Rock (Gneiss) / Igneous Rocks

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Quartz (Smoky/Granular variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Granular variety)

Silicon Dioxide (SiO2)

Basalt (Weathered River Pebble) (Extrusive Igneous Rock) — igneous

Basalt (Weathered River Pebble)

Extrusive Igneous Rock

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Tumbled amber (Fossilized tree resin; predominantly polymerized diterpenoid resin (succinite when Baltic-type)) — fossil

Tumbled amber

Fossilized tree resin; predominantly polymerized diterpenoid resin (succinite when Baltic-type)

Unidentified small mineral fragments (Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image) — mineral

Unidentified small mineral fragments

Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)