Rock Identifier

Category

Metamorphic Or Igneous Alteration

Browse metamorphic or igneous alteration specimens identified by the Rock Identifier community.

Learn about Metamorphic Or Igneous Alteration in the encyclopedia

Cordierite Hornfels

Cordierite Hornfels

Migmatite

Talc-carbonate Rock

Talc-carbonate Rock

Hornblende Schist

Hornblende Schist

Epidosite

Oregon Opal

Orendite

Orthoclase

Orca Agate

Orange Opal

Peacock Ore

Orange Garnet

Epidote in Matrix (Unakite-like Rock Fragment) (Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble) — metamorphic

Epidote in Matrix (Unakite-like Rock Fragment)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble

Muscovite Mica (Muscovite [KAl2(AlSi3O10)(OH)2]) — mineral

Muscovite Mica

Muscovite [KAl2(AlSi3O10)(OH)2]

Quartz with Host Rock Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz with Host Rock Matrix

Silicon Dioxide (SiO2)

Epidote with quartz/feldspar (Epidote, Ca2(Al,Fe)3(SiO4)3(OH)) — metamorphic

Epidote with quartz/feldspar

Epidote, Ca2(Al,Fe)3(SiO4)3(OH)

Dumortierite Quartz (Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)) — mineral

Dumortierite Quartz

Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)

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)

Greenstone (Metamorphic mafic rock (greenschist facies)) — metamorphic

Greenstone

Metamorphic mafic rock (greenschist facies)

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

Serpentine

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

Yellow Aventurine (Quartz (Silicon Dioxide, SiO2) with inclusions) — mineral

Yellow Aventurine

Quartz (Silicon Dioxide, SiO2) with inclusions

Quartz Druzy / Quartz Crystal Cluster (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy / Quartz Crystal Cluster

Silicon Dioxide (SiO2)

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

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Magnetite (Fe3O4 (Iron(II,III) oxide)) — mineral

Magnetite

Fe3O4 (Iron(II,III) oxide)

Soapstone / Steatite (Steatite (primarily Talc, Mg3Si4O10(OH)2)) — metamorphic

Soapstone / Steatite

Steatite (primarily Talc, Mg3Si4O10(OH)2)

Granite with Epidote (Granite, containing quartz, feldspar, and epidote) — Igneous

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Mica (Muscovite) (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Mica (Muscovite)

Muscovite (KAl2(AlSi3O10)(OH)2)

Citrine and Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine and Quartz

Silicon Dioxide (SiO2)

Hematite (Iron (III) oxide (Fe2O3)) — mineral

Hematite

Iron (III) oxide (Fe2O3)

Magnetite with Serpentine (Magnetite (Fe3O4) in Serpentine Matrix) — mineral

Magnetite with Serpentine

Magnetite (Fe3O4) in Serpentine Matrix

Quartz with Muscovite Mica (SiO2 with KAl2(AlSi3O10)(OH)2) — mineral group

Quartz with Muscovite Mica

SiO2 with KAl2(AlSi3O10)(OH)2

Serpentine (Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4

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

Epidote

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

Epidotite (Unakite-related) (Epidote-rich rock) — metamorphic

Epidotite (Unakite-related)

Epidote-rich rock

Chlorite (Small Flakes/Sand) (Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)) — mineral

Chlorite (Small Flakes/Sand)

Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Epidote-bearing Rock / Epidote Inclusion (Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock) — mineral

Epidote-bearing Rock / Epidote Inclusion

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock

Ruby (Cabochon) (Corundum (Al2O3)) — gemstone

Ruby (Cabochon)

Corundum (Al2O3)

Serpentinite (or Green Quartz Pebble) (Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)) — metamorphic

Serpentinite (or Green Quartz Pebble)

Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)

Tumbled Mixed Gemstones and Rocks (Various mineral species including quartz (SiO2) and silicate minerals) — mineral

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Talc Schist / Soapstone (Talc (Mg3Si4O10(OH)2)) — metamorphic

Talc Schist / Soapstone

Talc (Mg3Si4O10(OH)2)

Hematite (likely Botryoidal or Specularite variant) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (likely Botryoidal or Specularite variant)

Iron(III) oxide (Fe2O3)

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Epidote with Quartz (Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)) — mineral

Epidote with Quartz

Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)

Garnet amphibolite / Metamorphic Rock (Garnet Amphibolite (Hornblende - Almandine schist/gneiss)) — metamorphic

Garnet amphibolite / Metamorphic Rock

Garnet Amphibolite (Hornblende - Almandine schist/gneiss)

Yellow Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Chrysotile Serpentine (Asbestos in Matrix) (Chrysotile Mg3Si2O5(OH)4) — metamorphic

Chrysotile Serpentine (Asbestos in Matrix)

Chrysotile Mg3Si2O5(OH)4

Greenstone Pebble (Metabasalt / Greenstone) — metamorphic

Greenstone Pebble

Metabasalt / Greenstone

Greenstone (Metabasalt / Chlorite-actinolite-epidote schist) — metamorphic

Greenstone

Metabasalt / Chlorite-actinolite-epidote schist

Epidote (Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))) — mineral

Epidote

Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))

Fossil shell or shell fragment (Likely a calcareous bivalve or gastropod fragment; precise identification requires locality and microscopy) — fossil

Fossil shell or shell fragment

Likely a calcareous bivalve or gastropod fragment; precise identification requires locality and microscopy

Epidote (Greenstone) (Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) — metamorphic

Epidote (Greenstone)

Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)

Hematite (Iron Oxide (Fe2O3)) — mineral

Hematite

Iron Oxide (Fe2O3)

Orthoclase Feldspar (Orthoclase (KAlSi3O8)) — mineral

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Specular Hematite (Iron(III) oxide (Fe2O3)) — mineral

Specular Hematite

Iron(III) oxide (Fe2O3)