Rock Identifier

Category

Sedimentary Rock Or Mineral (Depending On Origin And Purity)

Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.

Sandstone (Ferruginous) (Arenite (Siliclastic Sedimentary Rock)) — sedimentary

Sandstone (Ferruginous)

Arenite (Siliclastic Sedimentary Rock)

Quartzite (River Pebble) (Meta-quartzite (composed primarily of SiO2)) — metamorphic

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

Gold Ore (in Quartz/Sulfide matrix) (Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)) — mineral

Gold Ore (in Quartz/Sulfide matrix)

Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Garnet (likely Almandine) (Almandine Garnet, Fe3Al2(SiO4)3) — mineral

Garnet (likely Almandine)

Almandine Garnet, Fe3Al2(SiO4)3

Amphibolite (Amphibolite) — metamorphic

Amphibolite

Amphibolite

Lapis Lazuli (Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)) — Mineral

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)

Red Garnet (Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)) — Mineral

Red Garnet

Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)

Olivine/Peridot (Magnesium Iron Silicate (Mg,Fe)2SiO4) — mineral

Olivine/Peridot

Magnesium Iron Silicate (Mg,Fe)2SiO4

Rough Quartz in Pegmatite Matrix (Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite) — igneous

Rough Quartz in Pegmatite Matrix

Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Amethyst (SiO2 (Silicon Dioxide)) — Mineral

Amethyst

SiO2 (Silicon Dioxide)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen) (Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.) — Metamorphic, Mineral (within a rock type)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Metamorphic, Mineral (within a rock type)

Emerald (Beryl (Be3Al2Si6O18) with trace amounts of Chromium and/or Vanadium) — mineral

Emerald

Beryl (Be3Al2Si6O18) with trace amounts of Chromium and/or Vanadium

Snowflake Obsidian (Volcanic glass with Cristobalite inclusions (70–75% SiO2)) — Igneous

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Blue Kyanite (Kyanite (Al2SiO5)) — mineral

Blue Kyanite

Kyanite (Al2SiO5)

Granite (Granite (Phaneritic Igneous Rock)) — igneous

Granite

Granite (Phaneritic Igneous Rock)

Aquamarine and clear quartz (Aquamarine (Be3Al2Si6O18), Quartz (SiO2)) — Mineral

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Sandstone (Picture Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Diorite (with Salt-and-Pepper Texture) (Diorite (Intrusive Igneous Rock)) — igneous

Diorite (with Salt-and-Pepper Texture)

Diorite (Intrusive Igneous Rock)

Granite (White Granite variant) (Phaneritic Plutonic Rock (High-silica Felsic)) — igneous

Granite (White Granite variant)

Phaneritic Plutonic Rock (High-silica Felsic)

Quartzite (Quartzite (primarily Silicon Dioxide, SiO2)) — metamorphic

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Howlite (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Fossilized Coral (Anthozoa (Fossilized)) — Sedimentary / Fossil

Fossilized Coral

Anthozoa (Fossilized)

Sedimentary / Fossil

River Pebbles (Stream-rounded rocks) (Fluvial Detritus (varied mineralogy)) — Mixed (predominantly sedimentary and igneous)

River Pebbles (Stream-rounded rocks)

Fluvial Detritus (varied mineralogy)

Mixed (predominantly sedimentary and igneous)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Fire Agate (Silicon Dioxide (SiO2) with layered Iron Oxide (Limonite/Goethite)) — mineral

Fire Agate

Silicon Dioxide (SiO2) with layered Iron Oxide (Limonite/Goethite)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Granite (Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image) (SiO₂ (silicon dioxide)) — Sedimentary

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

Black Tourmaline (Schorl) (Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)) — Mineral

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)

Quartz (Silicon Dioxide (SiO₂)) — Mineral

Quartz

Silicon Dioxide (SiO₂)

Quartz (Silicon dioxide (SiO₂)) — Mineral

Quartz

Silicon dioxide (SiO₂)

Sandstone (Tumbled/River Pebble) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Serpentinite (Serpentinite) — metamorphic

Serpentinite

Serpentinite

Quartz River Cobble (Silicon Dioxide (SiO2)) — mineral

Quartz River Cobble

Silicon Dioxide (SiO2)

Carnelian (Carnelian (a variety of Chalcedony, SiO

₂)) — Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)

Carnelian

Carnelian (a variety of Chalcedony, SiO ₂)

Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)

White Quartzite (Quartzite (primarily SiO2)) — metamorphic

White Quartzite

Quartzite (primarily SiO2)