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

Foliated Metamorphic Rock (likely Gneiss or Schist) (Gneissic Metamorphic Rock) — metamorphic

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Gneiss (Gneiss (high-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (high-grade metamorphic rock)

Limonite Concretion (Limonite (FeO(OH)·nH2O) Pseudomorph) — sedimentary

Limonite Concretion

Limonite (FeO(OH)·nH2O) Pseudomorph

Limonite (Iron Ore) (Hydrated ferric oxide mixture (FeO(OH)·nH2O)) — sedimentary

Limonite (Iron Ore)

Hydrated ferric oxide mixture (FeO(OH)·nH2O)

Red Sandstone (Iron-stained) (Clastic sedimentary rock (primarily Quartz with Iron Oxides)) — sedimentary

Red Sandstone (Iron-stained)

Clastic sedimentary rock (primarily Quartz with Iron Oxides)

Turquoise (Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Polished bumblebee jasper bead (Bumblebee jasper (trade name); chiefly calcite, aragonite, and pyrite, with variable realgar/orpiment and other minerals) — mineral

Polished bumblebee jasper bead

Bumblebee jasper (trade name); chiefly calcite, aragonite, and pyrite, with variable realgar/orpiment and other minerals

Weathered granite or granitic gneiss (Granite; chiefly quartz, feldspar, and mica, possibly with gneissic foliation) — igneous

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica, possibly with gneissic foliation

Garden Quartz (Lodalite) (Silicon Dioxide with various mineral inclusions (SiO2)) — mineral

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Polished agate geode slice (Microcrystalline quartz (chalcedony), SiO₂, with possible quartz-lined or calcite-filled cavity) — mineral

Polished agate geode slice

Microcrystalline quartz (chalcedony), SiO₂, with possible quartz-lined or calcite-filled cavity

Likely granitic gneiss pebble (Quartz–feldspar–biotite gneiss (visual identification; exact type uncertain)) — metamorphic

Likely granitic gneiss pebble

Quartz–feldspar–biotite gneiss (visual identification; exact type uncertain)

Mica Schist / Granite (Mica Schist (Silicate metamorphic rock)) — metamorphic

Mica Schist / Granite

Mica Schist (Silicate metamorphic rock)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Limonite (Iron Ore / Ochre) (Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore / Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Selenite (variety of Gypsum) (Calcium sulfate dihydrate (CaSO4·2H2O)) — mineral

Selenite (variety of Gypsum)

Calcium sulfate dihydrate (CaSO4·2H2O)

Merlinite (dendritic opal) (Common opal (hydrated amorphous silica, SiO₂·nH₂O) with dark manganese-oxide dendrites; the trade name “merlinite” is also applied to other patterned stones.) — sedimentary

Merlinite (dendritic opal)

Common opal (hydrated amorphous silica, SiO₂·nH₂O) with dark manganese-oxide dendrites; the trade name “merlinite” is also applied to other patterned stones.

Morganite and Aquamarine (Beryl) Bracelet (Beryllium aluminum silicate, Be3Al2(SiO3)6) — gemstone

Morganite and Aquamarine (Beryl) Bracelet

Beryllium aluminum silicate, Be3Al2(SiO3)6

Bicolor Quartz Tumble (Silicon Dioxide (SiO2)) — mineral

Bicolor Quartz Tumble

Silicon Dioxide (SiO2)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Epidote (Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))) — mineral

Epidote

Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))

Basalt with Vesicular/Amygdaloidal Alteration (Extrusive Igneous Rock (Mafic)) — igneous

Basalt with Vesicular/Amygdaloidal Alteration

Extrusive Igneous Rock (Mafic)

Basalt with Amygdule (Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill) — igneous

Basalt with Amygdule

Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill

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

Epidote

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

Hematite (likely Botryoidal or Specularite variant) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (likely Botryoidal or Specularite variant)

Iron(III) oxide (Fe2O3)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Hematite (Hematite (Iron(III) oxide, Fe2O3)) — mineral

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Native Copper Nugget (Native Copper (Cu)) — mineral

Native Copper Nugget

Native Copper (Cu)

Geode (Calcite or Quartz) (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)) — sedimentary

Geode (Calcite or Quartz)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

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

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Amphibolite (Amphibolite, composed mainly of amphibole and plagioclase feldspar) — metamorphic

Amphibolite

Amphibolite, composed mainly of amphibole and plagioclase feldspar

Blue Apatite (Fluoroapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Likely serpentinite (greenstone pebble) (Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, chrysotile, or antigorite)) — metamorphic

Likely serpentinite (greenstone pebble)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, chrysotile, or antigorite)

Biotite gneiss (probable) (Foliated quartz–feldspar–mica gneiss; commonly containing biotite mica, quartz, and plagioclase/alkali feldspar) — metamorphic

Biotite gneiss (probable)

Foliated quartz–feldspar–mica gneiss; commonly containing biotite mica, quartz, and plagioclase/alkali feldspar

Copper Ore (Mixed copper sulfides/oxides in gangue matrix) — mineral

Copper Ore

Mixed copper sulfides/oxides in gangue matrix

Gravel and Pebbles (Unconsolidated rock fragments / detrital sediment) — sedimentary

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Fossil Shark Tooth (Carcharodon or Carcharias fossil (Vertebrate Fossil)) — sedimentary

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Orthoclase Feldspar (Orthoclase (KAlSi3O8)) — mineral

Orthoclase Feldspar

Orthoclase (KAlSi3O8)