Rock Identifier

Category

Igneous And Metamorphic

Browse igneous and metamorphic specimens identified by the Rock Identifier community.

Mica Schist (Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2 mixed with SiO2)) — metamorphic

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2 mixed with SiO2)

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

Schist (Mica Schist (Composition typically involves Muscovite, Biotite, Quartz, and Feldspar)) — metamorphic

Schist

Mica Schist (Composition typically involves Muscovite, Biotite, Quartz, and Feldspar)

Schist (Kyanite Schist) (Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)) — metamorphic

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (Quartzite (chiefly SiO2)) — metamorphic

Quartzite

Quartzite (chiefly SiO2)

Mica-rich Sandstone or Micaceous Schist Weathering (Micaceous Schist (Muscovite-Quartz composition)) — Metamorphic or Sedimentary depending on local grade

Mica-rich Sandstone or Micaceous Schist Weathering

Micaceous Schist (Muscovite-Quartz composition)

Metamorphic or Sedimentary depending on local grade

Quartzite (with Iron Staining) (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite (with Iron Staining)

Metamorphosed Quartz Sandstone (SiO2)

Quartz (Crystal Fragment) (Quartz / Silicon Dioxide (SiO2)) — mineral

Quartz (Crystal Fragment)

Quartz / Silicon Dioxide (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Kyanite in Quartz (Al2SiO5 in SiO2) — metamorphic

Kyanite in Quartz

Al2SiO5 in SiO2

Grey Slate (Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)) — metamorphic

Grey Slate

Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)

Mica Schist (Foliated Metamorphic Rock (Schist)) — metamorphic

Mica Schist

Foliated Metamorphic Rock (Schist)

Milky Quartz with Mica inclusions (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Mica inclusions

Quartz (Silicon Dioxide, SiO2)

Jadeite (Jade) (NaAlSi2O6 (Sodium Aluminum Silicate)) — metamorphic

Jadeite (Jade)

NaAlSi2O6 (Sodium Aluminum Silicate)

Serpentine (Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Alexandrite (Chrysoberyl (BeAl2O4 with Chromium impurities)) — mineral

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Beryl (Aquamarine) in Matrix with Schorl (Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)) — mineral

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Aquamarine (Beryl (Be₃Al₂Si‑₆O₁₈)) — mineral

Aquamarine

Beryl (Be₃Al₂Si‑₆O₁₈)

Grey Agate (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Aquamarine (Beryl (Be3Al2Si6O18 with iron impurities)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Green Adventurine (SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)) — mineral

Green Adventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Schist with Biotite and Quartz (Biotite-Quartz Schist (Fe,Mg,Al silicate mix)) — metamorphic

Schist with Biotite and Quartz

Biotite-Quartz Schist (Fe,Mg,Al silicate mix)

Slate (Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)) — metamorphic

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Jasper with Epidote (Unakite-related) (Epidotized Quartzite (composed of Quartz, Epidote, and Feldspar)) — metamorphic

Jasper with Epidote (Unakite-related)

Epidotized Quartzite (composed of Quartz, Epidote, and Feldspar)

Talc (Talc (Mg₃Si₄O₁₀(OH)₂)) — Mineral

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Ruby (Corundum) (Aluminum oxide (Al2O3) with Chromium traces) — mineral

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Specular Hematite (on Schist/Matrix) (Hematite (Alpha-Fe2O3)) — mineral

Specular Hematite (on Schist/Matrix)

Hematite (Alpha-Fe2O3)

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

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Kyanite (Blue Kyanite) (Kyanite (Al2SiO5)) — mineral

Kyanite (Blue Kyanite)

Kyanite (Al2SiO5)

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

Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Quartzite (Metamorphic Rock (Mainly SiO2)) — metamorphic

Quartzite

Metamorphic Rock (Mainly SiO2)

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

Mica Schist (Garnetiferous)

Garnet-Mica Schist

Anthracite Coal (Anthracite (Carbon-rich metamorphic rock)) — metamorphic

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

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

Garnet (likely Almandine)

Almandine - Fe3Al2(SiO4)3

Lapis Lazuli (Fragment) (Lazurite-rich metamorphic rock) — metamorphic

Lapis Lazuli (Fragment)

Lazurite-rich metamorphic rock

Slate (Low-grade Metamorphic Rock) — metamorphic

Slate

Low-grade Metamorphic Rock

Slate (Slate (Foliated Metamorphic Rock)) — metamorphic

Slate

Slate (Foliated Metamorphic Rock)

Mica Schist (Foliated Metamorphic Rock (Schist)) — metamorphic

Mica Schist

Foliated Metamorphic Rock (Schist)

Quartzite with inclusions (Metamorphic Rock (Mainly SiO2)) — metamorphic

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

Lapis Lazuli (Lazurite-rich metamorphic rock) — metamorphic

Lapis Lazuli

Lazurite-rich metamorphic rock