Rock Identifier

Category

Igneous Or Metamorphic

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

Learn about Igneous Or Metamorphic in the encyclopedia

Carbonatite

Cordierite Hornfels

Cordierite Hornfels

Metabasalt

Eulysite

Migmatite

Anthracite

Metaquartzite

Slate

Marble

Hornfels

Metarhyolite

Metagabbro

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

Pyrite Nodules / Weathered Pyrite

Iron Sulfide (FeS2)

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

Orthoclase Feldspar (Orthoclase (KAlSi3O8)) — Mineral

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Common Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Common Opal

Hydrated amorphous silica (SiO2·nH2O)

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — gemstone

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Silicon Dioxide (SiO2)) — gemstone

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining (Quartz (SiO2)) — mineral

Milky Quartz with Iron Staining

Quartz (SiO2)

Strawberry Quartz (Aventurine) (Silicon Dioxide with Hematite/Lepidocrocite inclusions (SiO2)) — mineral

Strawberry Quartz (Aventurine)

Silicon Dioxide with Hematite/Lepidocrocite inclusions (SiO2)

Magnetic Sand Grain / Magnetite Pellet (Magnetite (Fe3O4)) — mineral

Magnetic Sand Grain / Magnetite Pellet

Magnetite (Fe3O4)

Sunstone Quartz / Aventurine Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Sunstone Quartz / Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions

Rounded gray pebble, likely quartz-rich stone (Indeterminate; possibly quartzite or a weathered granitic pebble) — rock

Rounded gray pebble, likely quartz-rich stone

Indeterminate; possibly quartzite or a weathered granitic pebble

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-Stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Quartz (SiO2)) — sedimentary

Quartz Pebble

Quartz (SiO2)

Smoky Quartz (Quartz (SiO₂)) — Mineral

Smoky Quartz

Quartz (SiO₂)

Labradorite ((Na, Ca)(Si, Al)4O8) — mineral

Labradorite

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

Small rough mineral/rock fragment (Indeterminate; possibly quartz-bearing rock or weathered feldspar) — mineral

Small rough mineral/rock fragment

Indeterminate; possibly quartz-bearing rock or weathered feldspar

Feldspar (Potassium Feldspar (KAlSi3O8)) — mineral

Feldspar

Potassium Feldspar (KAlSi3O8)

Moonstone (Orthoclase (KAlSi3O8) or Oligoclase with adularescence) — gemstone

Moonstone

Orthoclase (KAlSi3O8) or Oligoclase with adularescence

Hematite (Iron Oxide (Fe2O3)) — mineral

Hematite

Iron Oxide (Fe2O3)

Quartz (Smoky/Brown variety) (Silicon dioxide (SiO2)) — mineral

Quartz (Smoky/Brown variety)

Silicon dioxide (SiO2)

Amethyst (SiO2 (Silicon Dioxide with Iron impurities)) — mineral

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Blue Apatite (Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)) — mineral

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Small rounded mineral/rock fragment (Indeterminate; possibly quartz-rich stone or feldspar) — mineral

Small rounded mineral/rock fragment

Indeterminate; possibly quartz-rich stone or feldspar

Small rounded stone or mineral fragment (Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment) — mineral

Small rounded stone or mineral fragment

Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment

Quartz (Gravel Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

Kaolinite (Kaolin) (Kaolinite (Al2Si2O5(OH)4)) — mineral

Kaolinite (Kaolin)

Kaolinite (Al2Si2O5(OH)4)

Biotite on Quartz (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)) — mineral

Biotite on Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)

Quartz Pebble (with Feldspar/Mica) (Granitic Quartz / SiO2 with KAlSi3O8) — igneous

Quartz Pebble (with Feldspar/Mica)

Granitic Quartz / SiO2 with KAlSi3O8

Unidentified small mineral fragments (Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image) — mineral

Unidentified small mineral fragments

Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image

Small tumbled pebble (likely quartz or feldspar) (Indeterminate; probable quartz (SiO₂) or feldspar) — mineral

Small tumbled pebble (likely quartz or feldspar)

Indeterminate; probable quartz (SiO₂) or feldspar

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Agate (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Agate

Silicon Dioxide (Chalcedony), SiO2

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Bronzite (MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)) — Mineral

Bronzite

MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Amethyst (Chevron or Banded Amethyst) (Silicon Dioxide (SiO2) with trace Iron (Fe)) — mineral

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with trace Iron (Fe)