Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Category
Igneous Or Sedimentary (Water Worn)
Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.
Learn about Igneous Or Sedimentary (Water Worn) in the encyclopedia
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Magnetite
Magnetite (Fe3O4)
mineral
Alkali Basalt with iron oxidation
Mafic Volcanic Rock (Fe-bearing Basalt)
igneous
Apache Tear
Obsidian (Hydrated Silica Glass)
igneous
Basalt Pebble
Basalt
igneous
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss (Stream-worn Cobble)
Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)
metamorphic
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Water-worn black pebble, likely basalt
Basalt (fine-grained mafic volcanic rock; identification from the image is provisional)
igneous
Porphyritic Basalt (with Olivine or Quartz phenocryst)
Porphyritic Basalt (Mafic Extrusive)
igneous
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Stone (Basalt or fine-grained Schist)
Mafic Igneous Rock / Volcanic Basalt
igneous
Basalt Pebble
Aphanitic Igneous Rock
igneous
Mixed collection of common river stones
Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material
igneous, sedimentary, metamorphic
Possible fossil-bearing pebble
Unidentified fine-grained sedimentary rock; the small orange feature may be a fossil or mineral inclusion
sedimentary
Chalcedony (Agate/Carnelian pebbles)
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony (Common Agate pebble)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Chert (Cherty Pebble)
Silicon Dioxide (SiO2)
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt River Stone
Extrusive mafic igneous rock (Basalt)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sedimentary River Rock
Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)
sedimentary
Flint Pebble
Silicon dioxide (microcrystalline quartz / chalcedony)
sedimentary
Beach Pebble (Quartzite / Sandstone)
Quartz-rich sedimentary or metamorphic rock pebble
sedimentary
Painted River Rock
Painted Quartzite or Smooth Siltstone
sedimentary
River Stone (Chert/Basalt mix)
Microcrystalline Quartz (Chert) / Basalt
sedimentary
Crinoid Fossil in Chert
Siliceous limestone with Crinoidea fossil (SiO2)
sedimentary
Quartz-veined Sandstone Pebble
Quartzose Sandstone with Quartz Veinlets
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt River Stone
Basalt (Mafic volcanic rock)
igneous
Greenstone / Greenschist
Metamorphosed mafic igneous rock (Greenschist facies)
metamorphic
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic