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

Nephrite Jade (Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Fuchsite in Quartz (K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)) — metamorphic

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)

Nephrite Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Nephrite Jade (Ca2(Mg, Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Red gemstone ring, likely garnet or synthetic ruby (Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish) — gemstone

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

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

Serpentinite

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

Chrysotile Asbestos (Chrysotile [Mg3Si2O5(OH)4]) — mineral

Chrysotile Asbestos

Chrysotile [Mg3Si2O5(OH)4]

Rhodonite (Rhodonite ((Mn2+,Fe2+,Mg,Ca)SiO3)) — metamorphic

Rhodonite

Rhodonite ((Mn2+,Fe2+,Mg,Ca)SiO3)

Quartz-rich breccia or vein quartz with dark inclusions (Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals) — igneous

Quartz-rich breccia or vein quartz with dark inclusions

Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals

Soapstone Carving (Steatite) — metamorphic

Soapstone Carving

Steatite

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Nephrite Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Likely chlorite schist or altered mafic rock (Chlorite–actinolite schist; commonly composed of chlorite, actinolite/amphibole, epidote, and albite) — metamorphic

Likely chlorite schist or altered mafic rock

Chlorite–actinolite schist; commonly composed of chlorite, actinolite/amphibole, epidote, and albite

Faceted yellow gemstone, likely citrine (Citrine (quartz), SiO₂; possibly yellow sapphire or synthetic glass without testing) — gemstone

Faceted yellow gemstone, likely citrine

Citrine (quartz), SiO₂; possibly yellow sapphire or synthetic glass without testing

Green Spot Jasper (Kiwi Jasper / Sesame Jasper) (Partially altered granitic rock rich in quartz, microcline feldspar, and tourmaline or amphibole inclusions) — metamorphic

Green Spot Jasper (Kiwi Jasper / Sesame Jasper)

Partially altered granitic rock rich in quartz, microcline feldspar, and tourmaline or amphibole inclusions

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Serpentinite (Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)

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

Epidote

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

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Serpentinite

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

Likely basalt (possibly vesicular basalt) (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine, with iron-titanium oxides) — igneous

Likely basalt (possibly vesicular basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine, with iron-titanium oxides

Sodalite (Sodalite (Na8Al6Si6O24Cl2)) — mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

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

Hematite

Hematite, Iron(III) oxide (Fe2O3)

Red Quartz (Silicon Dioxide (SiO2) with Hematite inclusions) — mineral

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Unakite (Altered Granite (Granitic Metamorphic Rock)) — metamorphic

Unakite

Altered Granite (Granitic Metamorphic Rock)

Milky quartz vein fragment (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz vein fragment

Quartz, silicon dioxide (SiO₂)

Rose Quartz (Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)) — mineral

Rose Quartz

Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Vesicular volcanic rock, likely weathered pumice or scoria (Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides) — igneous

Vesicular volcanic rock, likely weathered pumice or scoria

Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides

Rounded pale-green pebble, likely serpentinite or altered basalt (Probable serpentinite (serpentine-group minerals) or weathered mafic rock; exact identification requires testing) — igneous

Rounded pale-green pebble, likely serpentinite or altered basalt

Probable serpentinite (serpentine-group minerals) or weathered mafic rock; exact identification requires testing

Jasper with Epidote (Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate) — sedimentary

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate

White Jade (Nephrite) (Tremolite-Actinolite series [Ca2(Mg,Fe)5Si8O22(OH)2]) — metamorphic

White Jade (Nephrite)

Tremolite-Actinolite series [Ca2(Mg,Fe)5Si8O22(OH)2]

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

Serpentine

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

Nephrite Jade (Nephrite (a variety of the amphibole series: Actinolite-Tremolite) Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Nephrite (a variety of the amphibole series: Actinolite-Tremolite) Ca2(Mg,Fe)5Si8O22(OH)2

Nephrite Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Nephrite Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Sapphire (Corundum variety) (Sapphire (Al₂O₃)) — Mineral

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Anthracite Coal (Anthracite (Carbon rank grade)) — sedimentary

Anthracite Coal

Anthracite (Carbon rank grade)

Dragon Blood Jasper (Epidote with Pietersite or Red Jasper (Silicate mineral)) — metamorphic

Dragon Blood Jasper

Epidote with Pietersite or Red Jasper (Silicate mineral)