Rock Identifier

Category

Minerals

Browse minerals specimens identified by the Rock Identifier community.

Learn about Minerals in the encyclopedia

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Dolomite

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

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)

Milky quartz (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, likely milky quartz with iron staining (Mostly quartz (SiO₂); exact rock type cannot be confirmed from the photo) — mineral

Quartz-rich rock, likely milky quartz with iron staining

Mostly quartz (SiO₂); exact rock type cannot be confirmed from the photo

Tumbled quartz (likely milky quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Iron-stained milky quartz cluster (Quartz (SiO₂), with brown iron-oxide staining) — mineral

Iron-stained milky quartz cluster

Quartz (SiO₂), with brown iron-oxide staining

Tumbled milky quartz (Quartz, silicon dioxide (SiO₂)) — mineral

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (Silicon Dioxide (SiO2)) — mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz Vein Rock with Feldspar (Silicon Dioxide (SiO2) with Potassium Feldspar) — mineral

Quartz Vein Rock with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar

Topaz (Al2SiO4(F,OH)2) — mineral

Topaz

Al2SiO4(F,OH)2

Small rounded quartz-rich pebble (Likely quartz (SiO₂), possibly iron-stained or mixed with other minerals) — mineral

Small rounded quartz-rich pebble

Likely quartz (SiO₂), possibly iron-stained or mixed with other minerals

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Copper-bearing Quartz Vein in Host Rock (Quartz with Malachite/Chrysocolla staining) — igneous/metamorphic with mineral

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

igneous/metamorphic with mineral

Greenstone (Amygdaloidal Basalt) (Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)) — igneous

Greenstone (Amygdaloidal Basalt)

Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)

Granodiorite (Granodiorite (containing Plagioclase, Quartz, and K-feldspar)) — igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and K-feldspar)

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

Gneiss

Gneiss (High-grade Metamorphic Rock)

Green Slate or Metamorphic Rock (Metamorphic rock (chlorite/actinolite-bearing)) — metamorphic

Green Slate or Metamorphic Rock

Metamorphic rock (chlorite/actinolite-bearing)

Banded gneiss pebble (Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and mica or amphibole) — metamorphic

Banded gneiss pebble

Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and mica or amphibole

Quartz vein in host rock (Quartz (SiO₂) in an undetermined mineralized host rock) — mineral

Quartz vein in host rock

Quartz (SiO₂) in an undetermined mineralized host rock

Petrified Wood / Fossilized Wood (Silicified Wood (Silicon Dioxide - SiO2)) — fossil

Petrified Wood / Fossilized Wood

Silicified Wood (Silicon Dioxide - SiO2)

Pyrite in Quartz (Iron Sulfide in Silicon Dioxide (FeS2 + SiO2)) — mineral

Pyrite in Quartz

Iron Sulfide in Silicon Dioxide (FeS2 + SiO2)

Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O) — mineral

Limonite

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

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O) — mineral

Limonite

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

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Septarian nodule fragment (Calcite-filled septarian concretion, commonly with a mudstone or limestone matrix) — sedimentary

Septarian nodule fragment

Calcite-filled septarian concretion, commonly with a mudstone or limestone matrix

Fossilized tooth, possibly a shark tooth (Indeterminate fossil tooth; species cannot be identified from this view) — fossil

Fossilized tooth, possibly a shark tooth

Indeterminate fossil tooth; species cannot be identified from this view

Unidentified small green-brown mineral fragment (Indeterminate from the photograph; possibly olivine, but identification is uncertain) — mineral

Unidentified small green-brown mineral fragment

Indeterminate from the photograph; possibly olivine, but identification is uncertain

Small gray mineral fragment (likely quartz or quartz-rich rock) (Unidentified; quartz is SiO₂) — mineral

Small gray mineral fragment (likely quartz or quartz-rich rock)

Unidentified; quartz is SiO₂

Small dark-brown mineral pebble, identity uncertain (Not identifiable from the image; possibilities include iron-rich minerals such as magnetite or hematite) — mineral

Small dark-brown mineral pebble, identity uncertain

Not identifiable from the image; possibilities include iron-rich minerals such as magnetite or hematite

Likely raw metallic mineral specimen (Unidentified; possibly galena-bearing ore or magnetite-rich rock) — mineral

Likely raw metallic mineral specimen

Unidentified; possibly galena-bearing ore or magnetite-rich rock

Small brown mineral specimen, possibly mica-bearing rock (Unidentified from the image; exact mineral species cannot be determined at this scale) — mineral

Small brown mineral specimen, possibly mica-bearing rock

Unidentified from the image; exact mineral species cannot be determined at this scale

Likely blue-green kyanite crystal (Kyanite, Al₂SiO₅) — mineral

Likely blue-green kyanite crystal

Kyanite, Al₂SiO₅

Likely mica-rich schist (Mica schist, probably muscovite- and/or biotite-bearing; exact identification requires closer examination) — metamorphic

Likely mica-rich schist

Mica schist, probably muscovite- and/or biotite-bearing; exact identification requires closer examination

River Cobble (likely Basalt or Greenstone) (Mafic Igneous Rock (with possible chloritic alteration)) — igneous

River Cobble (likely Basalt or Greenstone)

Mafic Igneous Rock (with possible chloritic alteration)