Rock Identifier

Category

Igneous Or Sedimentary (Water Worn)

Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.

Banded Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic Rock)

Gneiss (specifically a weathered or stream-worn specimen) (Gneiss (Foliated Metamorphic Rock)) — metamorphic

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Blue Chalcedony (Microcrystalline Quartz (SiO2)) — mineral

Blue Chalcedony

Microcrystalline Quartz (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Granite (Pink/Potassium-rich) (Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)) — igneous

Granite (Pink/Potassium-rich)

Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Basalt with Quartz Veins (Basalt (composition: SiO2, MgO, FeO, Al2O3, CaO)) — igneous

Basalt with Quartz Veins

Basalt (composition: SiO2, MgO, FeO, Al2O3, CaO)

Red Jasper (possibly Chert/Argillite) (Jasper (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper (possibly Chert/Argillite)

Jasper (SiO2) with iron oxide inclusions

Quartz pebble (Silicon Dioxide (SiO2)) — mineral

Quartz pebble

Silicon Dioxide (SiO2)

Quartzite River Cobble (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Cobble

Quartzite (primarily SiO2)

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

Gneiss

Gneiss (Metamorphic high-grade)

Basalt (Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Carnelian (Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)) — mineral

Carnelian

Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)

Nephrite Jade (Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)) — metamorphic

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Red Jasper (Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)) — sedimentary

Red Jasper

Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)

Chert (often called Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Brecciated or Veined) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Chert (often called Flint in this context) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint in this context)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Chert (Jasper variation) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Diorite (Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)) — igneous

Diorite

Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)

Pyrite (Iron Pyrite (FeS2)) — Mineral

Pyrite

Iron Pyrite (FeS2)

Milky Quartz (Water-Worn Cobble) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Water-Worn Cobble)

Silicon Dioxide (SiO2)

Turquoise (possible Dyed Magnesite/Howlite) (CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise (possible Dyed Magnesite/Howlite)

CuAl6(PO4)4(OH)8·4H2O

Jadeite Jade (Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)) — metamorphic

Jadeite Jade

Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)

Greenstone (Metabasalt / Greenschist facies rock) — metamorphic

Greenstone

Metabasalt / Greenschist facies rock

Basalt (Basalt) — Igneous

Basalt

Basalt

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

Pebble (Clast (specifically a granule or small pebble)) — Sedimentary

Pebble

Clast (specifically a granule or small pebble)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Granodiorite (foreground) and Rose Quartz (background) (Granodiorite / Quartz (SiO2)) — igneous

Granodiorite (foreground) and Rose Quartz (background)

Granodiorite / Quartz (SiO2)

Granite (Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Porphyritic Andesite (often called Chinese Writing Stone) (Porphyritic Basaltic Andesite with Feldspar Phenocrysts) — igneous

Porphyritic Andesite (often called Chinese Writing Stone)

Porphyritic Basaltic Andesite with Feldspar Phenocrysts

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Gneiss (Foliated Metamorphic Rock (Gneiss)) — metamorphic

Gneiss

Foliated Metamorphic Rock (Gneiss)

Citrine (Silicon Dioxide (SiO2) - Yellow Quartz variety) — mineral

Citrine

Silicon Dioxide (SiO2) - Yellow Quartz variety

Quartz (specifically a water-worn river pebble) (Silicon Dioxide (SiO2)) — Mineral

Quartz (specifically a water-worn river pebble)

Silicon Dioxide (SiO2)

Quartz Druze on Matrix (Geode Fragment) (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Pumice or Tuff (Pumice / Tuff) — igneous

Pumice or Tuff

Pumice / Tuff

Banded Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade metamorphic rock)