Rock Identifier

Category

Mineral And Metamorphic Rock

Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.

Learn about Mineral And Metamorphic Rock in the encyclopedia

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Eulysite

Hornfels

Metabasalt

Halite

Metagabbro

Metarhyolite

Cordierite Hornfels

Cordierite Hornfels

Dolomite

Gypsum

Rose Quartz (Rose Quartz (SiO2)) — Mineral

Rose Quartz

Rose Quartz (SiO2)

Unakite / Red Jasper beach pebble (Altered Granite (Epidotized Feldspar and Quartz)) — metamorphic

Unakite / Red Jasper beach pebble

Altered Granite (Epidotized Feldspar and Quartz)

Hematite (Iron Ore) (Hematite (Fe2O3)) — mineral

Hematite (Iron Ore)

Hematite (Fe2O3)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Serpentinite (River Pebble) (Serpentinite (complex of Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)) — metamorphic

Serpentinite (River Pebble)

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)

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

Arkosic Sandstone (or Conglomeritic Sandstone fragment) (Arkose (rich in feldspar)) — sedimentary

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite) (Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)) — mineral

Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Tiger's Eye (likely Hawk's Eye variant) (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye (likely Hawk's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Unakite (Epidotized Granite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))) — metamorphic

Unakite

Epidotized Granite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Pyrite with Iron Oxides (Fool's Gold in Matrix) (Iron Sulfide (FeS2)) — mineral

Pyrite with Iron Oxides (Fool's Gold in Matrix)

Iron Sulfide (FeS2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Quartzite Pebble (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Graphite Schist (C (Carbonaceous Schist)) — metamorphic

Graphite Schist

C (Carbonaceous Schist)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Granite (Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Smoky Quartz (Smoky Quartz (SiO

₂)) — Mineral

Smoky Quartz

Smoky Quartz (SiO ₂)

Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Shale or Argillite (Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)) — Sedimentary or Metamorphic (low grade)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Sedimentary or Metamorphic (low grade)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite (Metamorphic Quartz (SiO2)) — metamorphic

Quartzite

Metamorphic Quartz (SiO2)

Polished white quartz-rich pebble (Microcrystalline quartz (SiO₂), likely milky quartz or quartzite) — mineral

Polished white quartz-rich pebble

Microcrystalline quartz (SiO₂), likely milky quartz or quartzite

Limonite (Iron Ore/Hydrated Iron Oxide) (Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))) — Mineral

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Tumbled porphyritic granite (Granite, primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Tumbled porphyritic granite

Granite, primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende

Quartz (Quartz (SiO₂)) — mineral

Quartz

Quartz (SiO₂)

Gneiss (Orthogneiss / Paragneiss) — metamorphic

Gneiss

Orthogneiss / Paragneiss

Serpentinite (Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Man-made Carved Stone (Scream Mask/Skull motif) (Carved Soapstone or Serpentine-rich rock) — Anthropogenic (Man-made artifact)

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Anthropogenic (Man-made artifact)

Note: Item is not a geological specimen (n/a) — none

Note: Item is not a geological specimen

n/a

Epidote in Matrix (Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) — metamorphic

Epidote in Matrix

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Weathered granite or granitic gneiss (Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded) — igneous

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Aventurine (Silicon dioxide (SiO2) with inclusions) — mineral

Aventurine

Silicon dioxide (SiO2) with inclusions

Shale (Clastic Sedimentary Rock) — sedimentary

Shale

Clastic Sedimentary Rock

Sapphire (Corundum (Al2O3)) — mineral

Sapphire

Corundum (Al2O3)

Gravel and Sediment Sample (Mixed clastic sediment) — sedimentary

Gravel and Sediment Sample

Mixed clastic sediment

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

Serpentinite

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

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Greenstone / Greenschist (Greenschist (composed of chlorite, epidote, and actinolite)) — metamorphic

Greenstone / Greenschist

Greenschist (composed of chlorite, epidote, and actinolite)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Quartzite (Quartzite (mainly SiO2)) — metamorphic

Quartzite

Quartzite (mainly SiO2)

Osumilite in Granite Matrix ((K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30) — mineral

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30