Rock Identifier

Category

Rock (Likely Sedimentary)

Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Matrix (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Smoky variety on matrix) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Chalcedony (Agate Nodules) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate Nodules)

Silicon Dioxide (SiO2)

Coal (most likely Bituminous or Anthracite) (Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)) — Sedimentary Rock

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Sedimentary Rock

Coal (most likely Bituminous or Anthracite) (Coal (primarily composed of carbon with varying amounts of other elements)) — Sedimentary rock

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Sedimentary rock

Basalt (Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)) — igneous

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Yellow Quartzite (River Pebble) (Quartzite (primarily SiO2 with iron oxide inclusions)) — metamorphic

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2 with iron oxide inclusions)

Chalcanthite (Likely Synthetic/Lab-Grown) (Hydrated copper(II) sulfate (CuSO4·5H2O)) — mineral

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Shale (Lutaceous sedimentary rock) — sedimentary

Shale

Lutaceous sedimentary rock

Granite (Phaneritic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Igneous Rock (Granite)

Sandstone or Siltstone (Arenite (if sandstone)) — Sedimentary

Sandstone or Siltstone

Arenite (if sandstone)

Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

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)

Granite (Phaneritic plutonic rock (SiO2 range 70-75%)) — igneous

Granite

Phaneritic plutonic rock (SiO2 range 70-75%)

Note: Item is not a geological specimen (Guitar Components (Steel, Nickel, Plastic, Wood)) — Synthetic/Consumer Product

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Synthetic/Consumer Product

Crushed Limestone and Calcite (Calcium Carbonate (CaCO3)) — sedimentary

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Granite fragment (Phaneritic Igneous Rock (Granitic composition)) — igneous

Granite fragment

Phaneritic Igneous Rock (Granitic composition)

Granite (with alteration) (Granite (Felsic intrusive igneous rock)) — igneous

Granite (with alteration)

Granite (Felsic intrusive igneous rock)

Banded River Rock / Gneiss (highly weathered) (Gneiss) — Metamorphic rock

Banded River Rock / Gneiss (highly weathered)

Gneiss

Metamorphic rock

Chalcedony (Agate/Carnelian type) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)

Granite (Granite (composed primarily of Quartz, Feldspar, and Mica)) — igneous

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Chalcedony (Botryoidal/Tumbled Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Botryoidal/Tumbled Agate)

Silicon Dioxide (SiO2)

Chalcedony (Agate Pebble) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — Mineral

Quartz

Silicon Dioxide (SiO2)

Granodiorite Pebble (Granodiorite) — igneous

Granodiorite Pebble

Granodiorite

River Pebble (Gneiss or Quartzite variant) (Course-grained Metamorphic Rock (likely SiO2 dominant)) — metamorphic

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Agate (Carnelian-like) (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Agate (Carnelian-like)

Chalcedony (Silicon Dioxide, SiO2)

Sandstone with Algae Growth (Arenite with Chlorophyta/Lichen) — sedimentary

Sandstone with Algae Growth

Arenite with Chlorophyta/Lichen

River Stone (Basalt Porphyry) (Porphyritic Basalt) — igneous

River Stone (Basalt Porphyry)

Porphyritic Basalt

Angelite (Anhydrite (Calcium Sulfate, CaSO4)) — mineral

Angelite

Anhydrite (Calcium Sulfate, CaSO4)

Quartz Pebble (Chert/Chalcedony variety) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Basalt (Vesicular Basalt) — igneous

Basalt

Vesicular Basalt

Shale (Fissile mudstone (Shale)) — sedimentary

Shale

Fissile mudstone (Shale)

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

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Quartz (likely milky/rose quartz variety) (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz (likely milky/rose quartz variety)

Quartz (SiO2 - Silicon Dioxide)

Eclogite (Eclogite (Omphacite + Pyrope)) — metamorphic

Eclogite

Eclogite (Omphacite + Pyrope)

Quartzite River Pebble (Quartzite (SiO2)) — metamorphic

Quartzite River Pebble

Quartzite (SiO2)

Emerald with Matrix (Emerald in Mica Schist) (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Emerald with Matrix (Emerald in Mica Schist)

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz Pebble (with Mica or Iron staining) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)