Rock Identifier

Category

Rock (Likely Sedimentary)

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

Learn about Rock (Likely Sedimentary) in the encyclopedia

Asphalt Rock

Rock Gypsum

Conglomerate

Breccia

Ironstone

Limestone

Claystone

Phosphorite

Chert

Coal

Pisolite

Mudstone

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

Chalcedony (Common Agate)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate/Chert) (Cryptocrystalline Quartz (SiO2)) — mineral

Yellow Chalcedony (Agate/Chert)

Cryptocrystalline Quartz (SiO2)

Basalt Pebble (Basalt (Mafic volcanic rock)) — igneous

Basalt Pebble

Basalt (Mafic volcanic rock)

Basalt (with possible weathered crust) (Basalt (composition: Plagioclase feldspar, Pyroxene, Olivine)) — igneous

Basalt (with possible weathered crust)

Basalt (composition: Plagioclase feldspar, Pyroxene, Olivine)

Shungite (Non-crystalline carbon (similar to anthracite coal or meta-anthracite)) — metamorphic

Shungite

Non-crystalline carbon (similar to anthracite coal or meta-anthracite)

Quartz geode (Crystalline quartz, silicon dioxide (SiO₂), lining a volcanic geode) — mineral

Quartz geode

Crystalline quartz, silicon dioxide (SiO₂), lining a volcanic geode

Granite (Intrusive igneous felsic rock) — igneous

Granite

Intrusive igneous felsic rock

Quartz and Mixed Sedimentary Rocks (Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies) — sedimentary

Quartz and Mixed Sedimentary Rocks

Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies

Bivalve Fossil (Clam Fossil) (Class Bivalvia (likely Gryphaea or similar Order)) — fossil

Bivalve Fossil (Clam Fossil)

Class Bivalvia (likely Gryphaea or similar Order)

Calcite Rhomb (Calcium Carbonate (CaCO3)) — mineral

Calcite Rhomb

Calcium Carbonate (CaCO3)

Quartz (likely Rose or Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (likely Rose or Milky Quartz)

Silicon Dioxide (SiO2)

Yellow Chert (Jasper) (Chalcedony (SiO2) with iron oxide inclusions) — sedimentary

Yellow Chert (Jasper)

Chalcedony (SiO2) with iron oxide inclusions

Likely weathered granite or pegmatitic rock (Granite/pegmatite; primarily quartz (SiO₂), feldspar, and mica) — igneous

Likely weathered granite or pegmatitic rock

Granite/pegmatite; primarily quartz (SiO₂), feldspar, and mica

Calcite on Limestone (Calcium Carbonate (CaCO3)) — mineral

Calcite on Limestone

Calcium Carbonate (CaCO3)

Quartz Pebble (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Tumbled dark stone, likely basalt or chert (Basalt (fine-grained mafic rock), possibly weathered chert; exact identification requires testing) — igneous

Tumbled dark stone, likely basalt or chert

Basalt (fine-grained mafic rock), possibly weathered chert; exact identification requires testing

Weathered basalt pebble (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine) — igneous

Weathered basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Granite (Granite (dominated by Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (dominated by Quartz, Alkali Feldspar, and Plagioclase)

Quartz-rich metamorphic rock, likely quartzite (Quartzite; predominantly quartz (SiO₂), with minor iron-oxide and mica impurities) — metamorphic

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor iron-oxide and mica impurities

Sandstone or Mudstone (Sedimentary Rock) — sedimentary

Sandstone or Mudstone

Sedimentary Rock

Weathered basalt or iron-rich volcanic rock (Fine-grained mafic igneous rock, likely basalt; exact identification requires testing) — igneous

Weathered basalt or iron-rich volcanic rock

Fine-grained mafic igneous rock, likely basalt; exact identification requires testing

Possible dark igneous rock (Indeterminate; likely basalt or fine-grained mafic rock) — igneous

Possible dark igneous rock

Indeterminate; likely basalt or fine-grained mafic rock

Metallic Ornament / Jewelry (N/A - This is an artificial object, not a geological specimen.) — This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.

Possible weathered granite or gneiss (Feldspar–quartz–mica rock; exact identification is uncertain from the photograph) — igneous

Possible weathered granite or gneiss

Feldspar–quartz–mica rock; exact identification is uncertain from the photograph

White Quartz (Quartz (SiO2)) — Mineral

White Quartz

Quartz (SiO2)

Basalt Pebble (Basalt (Mafic volcanic rock)) — igneous

Basalt Pebble

Basalt (Mafic volcanic rock)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Polished orbicular jasper (likely ocean jasper) (Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals) — sedimentary

Polished orbicular jasper (likely ocean jasper)

Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals

Pink Granite (Granite (Felsic plutonic rock)) — igneous

Pink Granite

Granite (Felsic plutonic rock)

Pearl necklace (Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)) — gemstone

Pearl necklace

Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)

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

Chalcanthite (Likely Synthetic/Lab-Grown)

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

Vein-filled Basalt or Diabase Pebble (Mafic igneous rock with quartz/calcite veins) — igneous

Vein-filled Basalt or Diabase Pebble

Mafic igneous rock with quartz/calcite veins

Speckled rounded stone, likely granite or granitic gneiss (Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole) — igneous

Speckled rounded stone, likely granite or granitic gneiss

Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole

Quartz-rich rock, likely milky quartz vein material (Quartz (SiO₂), possibly iron-stained massive quartz with minor feldspar or mica) — mineral

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly iron-stained massive quartz with minor feldspar or mica

Basalt River Cobble (Basalt (Mafic Igneous Rock)) — igneous

Basalt River Cobble

Basalt (Mafic Igneous Rock)

Fossiliferous Limestone (CaCO3 (with biological inclusions)) — sedimentary

Fossiliferous Limestone

CaCO3 (with biological inclusions)

Basalt (Basalt (composition of plagioclase, pyroxene, and olivine)) — igneous

Basalt

Basalt (composition of plagioclase, pyroxene, and olivine)

Basalt with Vesicular Texture (Basalt (SiO2 range 45-52%)) — igneous

Basalt with Vesicular Texture

Basalt (SiO2 range 45-52%)

Likely weathered quartz-rich rock fragment (Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock) — igneous

Likely weathered quartz-rich rock fragment

Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock

Weathered volcanic rock, likely andesite or basalt (Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals) — igneous

Weathered volcanic rock, likely andesite or basalt

Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals

Porphyritic Basalt (Porphyritic Basalt (containing Plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase phenocrysts)