Rock Identifier

Category

Igneous And Metamorphic

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

Learn about Igneous And Metamorphic in the encyclopedia

Carbonatite

Cordierite Hornfels

Cordierite Hornfels

Metabasalt

Eulysite

Migmatite

Anthracite

Metaquartzite

Slate

Marble

Hornfels

Metarhyolite

Metagabbro

Quartz-rich rock or quartz specimen (Quartz (SiO₂), likely massive quartz or quartz-bearing host rock) — mineral

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

Small reddish-brown mineral fragment (Uncertain; possibly iron-stained quartz, feldspar, or garnet) — mineral

Small reddish-brown mineral fragment

Uncertain; possibly iron-stained quartz, feldspar, or garnet

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Likely weathered sandstone or quartzite (Quartz-rich sandstone; possibly metamorphosed to quartzite (SiO₂-dominant)) — sedimentary

Likely weathered sandstone or quartzite

Quartz-rich sandstone; possibly metamorphosed to quartzite (SiO₂-dominant)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Tumbled or naturally weathered quartz-rich stone, possibly iron-stained quartz (Quartz (SiO₂), with yellow-brown iron-oxide staining; exact identification is uncertain from the photograph) — mineral

Tumbled or naturally weathered quartz-rich stone, possibly iron-stained quartz

Quartz (SiO₂), with yellow-brown iron-oxide staining; exact identification is uncertain from the photograph

Iron-stained quartz-rich rock, likely ferruginous quartzite (Quartzite (predominantly SiO₂) stained by iron oxides, likely hematite and goethite) — metamorphic

Iron-stained quartz-rich rock, likely ferruginous quartzite

Quartzite (predominantly SiO₂) stained by iron oxides, likely hematite and goethite

Weathered granite (likely) (Granite: chiefly quartz, feldspar, and mica; exact identification from the photo is uncertain.) — igneous

Weathered granite (likely)

Granite: chiefly quartz, feldspar, and mica; exact identification from the photo is uncertain.

Pebble (Clast (specifically a granule or small pebble)) — Sedimentary

Pebble

Clast (specifically a granule or small pebble)

Black Tourmaline (Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)) — mineral

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

Yellow Sapphire (Pukhraj) (Corundum (Al2O3)) — gemstone

Yellow Sapphire (Pukhraj)

Corundum (Al2O3)

Quartz (various varieties) (SiO₂ (Silicon Dioxide)) — Mineral

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

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

Epidote

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

Magnetite (Magnetite (Fe3O4)) — Mineral

Magnetite

Magnetite (Fe3O4)

Pyrite in Matrix (Iron Sulfide (FeS2)) — mineral

Pyrite in Matrix

Iron Sulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite Cube (Iron Sulfide (FeS2)) — mineral

Pyrite Cube

Iron Sulfide (FeS2)

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Milky quartz in weathered host rock (Quartz, silicon dioxide (SiO₂), likely occurring in altered igneous or metamorphic matrix) — mineral

Milky quartz in weathered host rock

Quartz, silicon dioxide (SiO₂), likely occurring in altered igneous or metamorphic matrix

Frosted Quartz (Silicon Dioxide (SiO2)) — mineral

Frosted Quartz

Silicon Dioxide (SiO2)

Yellow Sapphire or Citrine (Al2O3 (Corundum) or SiO2 (Quartz)) — mineral

Yellow Sapphire or Citrine

Al2O3 (Corundum) or SiO2 (Quartz)

Rose Quartz Bracelet (Silicon Dioxide (SiO2)) — mineral

Rose Quartz Bracelet

Silicon Dioxide (SiO2)

Biotite Mica (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)) — mineral

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Magnetite (Magnetite (Fe3O4)) — Mineral

Magnetite

Magnetite (Fe3O4)

Moonstone (Orthoclase feldspar (KAlSi3O8)) — mineral

Moonstone

Orthoclase feldspar (KAlSi3O8)

Pyrite Nodules / Weathered Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite Nodules / Weathered Pyrite

Iron Sulfide (FeS2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Aventurine (likely Green Aventurine) (Silicon Dioxide (SiO2) with mineral inclusions) — Mineral/Mineraloid within a rock matrix

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Mineral/Mineraloid within a rock matrix

Citrine (Silicon dioxide (Quartz variety), SiO2) — mineral

Citrine

Silicon dioxide (Quartz variety), SiO2

Magnetite (Magnetite (Fe3O4)) — Mineral

Magnetite

Magnetite (Fe3O4)

Bronzite (Enstatite with iron (Mg,Fe2)SiO3) — mineral

Bronzite

Enstatite with iron (Mg,Fe2)SiO3

Pink Quartz Cluster (Silicon Dioxide (SiO2)) — mineral

Pink Quartz Cluster

Silicon Dioxide (SiO2)

Chalcopyrite (CuFeS2) — mineral

Chalcopyrite

CuFeS2

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Copper Ore (Chalcopyrite in host rock (CuFeS2)) — mineral

Copper Ore

Chalcopyrite in host rock (CuFeS2)

Quartz pebble (SiO2, Quartz) — mineral

Quartz pebble

SiO2, Quartz

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — gemstone

Smoky Quartz

Silicon Dioxide (SiO2)

Limonite Concretion (Hydrated Iron Oxide Hydroxide, FeO(OH)nH2O) — mineral

Limonite Concretion

Hydrated Iron Oxide Hydroxide, FeO(OH)nH2O