Rock Identifier

Category

Mineral (Biogenic)

Browse mineral (biogenic) specimens identified by the Rock Identifier community.

Learn about Mineral (Biogenic) in the encyclopedia

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Dolomite

Weathered granite or granitic gneiss (Granite/granitic gneiss, composed mainly of quartz, feldspar, and mica) — igneous

Weathered granite or granitic gneiss

Granite/granitic gneiss, composed mainly of quartz, feldspar, and mica

Mica schist (Schist dominated by muscovite/biotite mica, commonly with quartz and feldspar) — metamorphic

Mica schist

Schist dominated by muscovite/biotite mica, commonly with quartz and feldspar

Weathered granite pebble (Granite, a coarse-grained felsic intrusive igneous rock) — igneous

Weathered granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Unidentified gray mineral/rock fragment (Indeterminate from the photograph; possibly a quartz- or feldspar-bearing rock fragment) — mineral

Unidentified gray mineral/rock fragment

Indeterminate from the photograph; possibly a quartz- or feldspar-bearing rock fragment

Tiny metallic-looking mineral or rock fragment (Unidentifiable from the image; possibly a small metallic mineral grain) — mineral

Tiny metallic-looking mineral or rock fragment

Unidentifiable from the image; possibly a small metallic mineral grain

Possible green glassy mineral pebble (Undetermined; possibly green aventurine (quartz) or another green mineral) — mineral

Possible green glassy mineral pebble

Undetermined; possibly green aventurine (quartz) or another green mineral

Granite (Intrusive Felsic Igneous Rock) — igneous

Granite

Intrusive Felsic Igneous Rock

Banded Gneiss (Gneiss) — metamorphic

Banded Gneiss

Gneiss

Banded Sandstone (River Cobble) (Arenite Sandstone with heavy mineral layering) — sedimentary

Banded Sandstone (River Cobble)

Arenite Sandstone with heavy mineral layering

Gneiss (foliated metamorphic rock) (Gneiss) — metamorphic

Gneiss (foliated metamorphic rock)

Gneiss

Weathered mica schist (tentative) (Mica schist, likely muscovite–biotite schist with quartz and feldspar) — metamorphic

Weathered mica schist (tentative)

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Yellow-brown stone or mineral fragment (Unidentified; the image does not show enough detail for a reliable identification) — mineral

Yellow-brown stone or mineral fragment

Unidentified; the image does not show enough detail for a reliable identification

Small pale mineral fragment, possibly calcite (Unidentified; calcite (CaCO₃) is one possibility) — mineral

Small pale mineral fragment, possibly calcite

Unidentified; calcite (CaCO₃) is one possibility

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Sandstone with Quartz/Calcite druse (Arenite with druse (SiO2 or CaCO3)) — sedimentary

Sandstone with Quartz/Calcite druse

Arenite with druse (SiO2 or CaCO3)

Greenstone pebble (Greenschist-facies mafic rock, commonly derived from basalt; likely rich in chlorite, actinolite, and epidote) — metamorphic

Greenstone pebble

Greenschist-facies mafic rock, commonly derived from basalt; likely rich in chlorite, actinolite, and epidote

Gravel (Unconsolidated rock fragments / detrital sediment) — sedimentary

Gravel

Unconsolidated rock fragments / detrital sediment

Granite (Intrusive Igneous Rock (Felsic)) — igneous

Granite

Intrusive Igneous Rock (Felsic)

Basalt with Vesicular Amygdule (Extrusive igneous rock (Mafic)) — igneous

Basalt with Vesicular Amygdule

Extrusive igneous rock (Mafic)

Yellow Apatite (Fluorapatite (Ca5(PO4)3(F,Cl,OH))) — mineral

Yellow Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Fine-grained sedimentary rock, likely mudstone (Mudstone (clay- and silt-sized siliciclastic sedimentary rock)) — sedimentary

Fine-grained sedimentary rock, likely mudstone

Mudstone (clay- and silt-sized siliciclastic sedimentary rock)

Likely amphibolite (Amphibolite, composed mainly of hornblende and plagioclase feldspar) — metamorphic

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Granite (Coarse-grained felsic intrusive igneous rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende) — igneous

Granite

Coarse-grained felsic intrusive igneous rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Granite (likely weathered granite or granitic gneiss) (Granite; chiefly quartz (SiO₂), feldspar, and mica) — igneous

Granite (likely weathered granite or granitic gneiss)

Granite; chiefly quartz (SiO₂), feldspar, and mica

Spinosaurus fossil (permineralized bone) (Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)) — sedimentary

Spinosaurus fossil (permineralized bone)

Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)

Vesicular Basalt (Amygdaloidal Basalt (Mafic extrusive volcanic rock)) — Igneous

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Peacock Ore (Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)) — mineral

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Dark speckled granite pebble (Granite, a quartz–feldspar–mica plutonic rock) — igneous

Dark speckled granite pebble

Granite, a quartz–feldspar–mica plutonic rock

Weathered basalt pebble (Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products) — igneous

Weathered basalt pebble

Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products

Green Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Quartz-rich pegmatite with mica (Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining) — igneous

Quartz-rich pegmatite with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining

Diorite (Diorite (Phaneritic intermediate plutonic rock)) — igneous

Diorite

Diorite (Phaneritic intermediate plutonic rock)

Diorite (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (Metamorphic Rock)

Gneiss (Metamorphic Pebble) (Gneiss (SiO2-rich metamorphic rock)) — metamorphic

Gneiss (Metamorphic Pebble)

Gneiss (SiO2-rich metamorphic rock)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Proustite (Proustite (Ag3AsS3)) — mineral

Proustite

Proustite (Ag3AsS3)