Rock Identifier

Category

Metamorphic (Altered Igneous Rock)

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

Blue Sapphire (in a faceted jewelry setting) (Corundum (Al2O3) with trace Iron and Titanium) — mineral

Blue Sapphire (in a faceted jewelry setting)

Corundum (Al2O3) with trace Iron and Titanium

Magnetite / Hematite mix (Iron Ore) (Fe3O4 (Magnetite) / Fe2O3 (Hematite)) — mineral

Magnetite / Hematite mix (Iron Ore)

Fe3O4 (Magnetite) / Fe2O3 (Hematite)

Magnetite (Lodestone) (Magnetite (Fe3O4)) — mineral

Magnetite (Lodestone)

Magnetite (Fe3O4)

Quartz (possibly milky quartz) (Quartz (Silica; SiO₂)) — Mineral

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Phyllite (Phyllite (Foliated metamorphic rock)) — metamorphic

Phyllite

Phyllite (Foliated metamorphic rock)

Basalt with Granite Inclusions (Xenoliths) (Mafic igneous rock (Basalt) with Sialic minerals) — igneous

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

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

Basalt Cobble

Vesicular Basalt (Mafic Extrusive)

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Potassium Feldspar (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar

Orthoclase (KAlSi3O8)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Strawberry Quartz (Quartz with Hematite inclusions) (Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)) — mineral

Strawberry Quartz (Quartz with Hematite inclusions)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Quartz (Small Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Dearest Ring (Gemstones) (Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)) — mineral

Dearest Ring (Gemstones)

Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)

Plagioclase Feldspar (specifically Albite/Oligoclase) ((Na,Ca)(Si,Al)4O8) — mineral

Plagioclase Feldspar (specifically Albite/Oligoclase)

(Na,Ca)(Si,Al)4O8

Banded Gneiss (River Rock/Pebble) (Gneiss (specifically a banded variety often found as a river rock)) — Metamorphic Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Serpentinite (Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)) — metamorphic

Serpentinite

Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)

Garnet (Garnet (X3Y2(SiO4)3)) — mineral

Garnet

Garnet (X3Y2(SiO4)3)

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

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Lapis Lazuli (Tumbled) (Lazurite-dominated contact metamorphic rock) — metamorphic

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

Quartzite (Metamorphosed Quartz Sandstone) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone

Quartz Vein in Host Rock (Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)) — metamorphic

Quartz Vein in Host Rock

Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)

Muscovite Mica (Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2) — Mineral

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Sodalite (Sodalite (Na4Al3Si3O12Cl)) — Mineral

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Diopside (likely Chromian Diopside) (Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.) — mineral

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

Porphyry (likely Porphyritic Andesite or Basalt) (Porphyritic Igneous Rock) — igneous

Porphyry (likely Porphyritic Andesite or Basalt)

Porphyritic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt River Stone (Basaltic Igneous Rock) — igneous

Basalt River Stone

Basaltic Igneous Rock

Almandine Garnet (Almandine (Fe3Al2(SiO4)3)) — mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Mica Schist with Garnet (Garnet-Mica Schist) — metamorphic

Mica Schist with Garnet

Garnet-Mica Schist

Epidote (Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)) — mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Pyrite (on the right) and Magnetite or Hematite (on the left) (Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)) — mineral

Pyrite (on the right) and Magnetite or Hematite (on the left)

Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)

Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartz Crystal (Quartz (SiO₂)) — Mineral

Quartz Crystal

Quartz (SiO₂)

Milky Quartz with Mineral Inclusions (Silicon Dioxide (SiO2) with miscellaneous inclusions) — mineral

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions

Garnet Schist (Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)) — metamorphic

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

Pyrite (Iron Pyrite (FeS₂)) — Mineral

Pyrite

Iron Pyrite (FeS₂)