Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Igneous Or Sedimentary (Water Worn)
Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.
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Chalcedony (River Pebble)
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Granite Gneiss with Garnet
Garnetiferous Gneiss
metamorphic
Chert (Chalcedony/Agate Pebble)
Cryptocrystalline Silica (SiO2)
sedimentary
Heart-shaped Pebble (Limestone/Quartz)
Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)
sedimentary
Black Beach Pebble (Basalt / Slate Pebble)
Rounded Fine-Grained Clastic / Igneous Rock Pebble
sedimentary
Banded metamorphic pebble, likely gneiss
Foliated gneiss; quartz–feldspar–mica assemblage
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Carnelian
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Tumbled dark gray stone, possibly basalt or andesite
Fine-grained mafic to intermediate volcanic rock; exact mineralogy cannot be confirmed from the photograph
igneous
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
River Rock
N/A - General term for water-worn stones
sedimentary
Banded Chert
Chert (Silicon Dioxide, SiO2)
sedimentary
Reddish Brown Claystone or Siltstone
Argillite / Siltstone / Claystone
sedimentary
Wishing Stone (Basalt/Greywacke with Quartz Vein)
Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion
igneous/sedimentary
Pebble
Lithic fragment / Water-worn rock
sedimentary
Nile Agate
Silicon Dioxide (SiO2)
sedimentary
River Pebble (Basalt/Greywacke)
Weathered Basalt or Fine-Grained Greywacke
igneous/sedimentary
Vesicular basalt (likely scoria)
Basaltic volcanic rock; chiefly plagioclase, pyroxene, and olivine
igneous
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Rounded sandstone or siltstone cobble
Clastic sedimentary rock, likely quartz-rich sandstone (possibly fine-grained siltstone)
sedimentary
Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Greenstone / Basalt
Aphanitic Mafic Igneous Rock (Metabasalt)
igneous
Blue-gray stone pebble (possibly slag or a weathered rock)
Unidentified fine-grained rock; composition cannot be determined from the image
igneous
Quartz (Iron-stained or Ferruginous Quartz)
Silicon Dioxide (SiO2)
mineral
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Yellow Quartz Pebble (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt (Vesicular/Amygdaloidal or Water-Worn)
Basalt
igneous
River Pebble
Weathered Sedimentary Rock Fragment
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Quartz (Sea Glass or River-worn Pebble style)
Silicon Dioxide (SiO2)
mineral
Wishing Stone (Basalt or Chert with Quartz Veins)
Basalt or microcrystalline Quartz (Chert) with localized hydrothermal Quartz (SiO2) veining
igneous or sedimentary
River Pebble (Greywacke or Basaltic)
Massive Greywacke or Basaltic Andesite
sedimentary or igneous