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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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt pebble
Fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Rounded dark river pebble
Likely basalt or fine-grained andesite; exact identification requires testing
igneous
Basalt Pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Black river pebble, likely basalt
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
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
River Stone (Chert/Basalt mix)
Microcrystalline Quartz (Chert) / Basalt
sedimentary
Crinoid Fossil in Chert
Siliceous limestone with Crinoidea fossil (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
igneous, metamorphic, sedimentary
Yellow Chert (Cherty Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic plutonic igneous rock (felsic)
igneous
Chert (Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble (Greywacke or Chert mix)
Silicon Dioxide (SiO2) with varying mineral impurities
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-veined Sandstone Pebble
Quartzose Sandstone with Quartz Veinlets
sedimentary
Basalt Pebble (Beach Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Basalt (Water-worn)
Aphanitic Mafic Igneous Rock
Igneous
Granite Water-worn Cobble
Felsic intrusive igneous rock (Phaneritic)
igneous
Granite
Granite
Igneous
Gneiss Pebble
Gneiss (Metamorphic Foliated Rock)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Mixed River Pebbles (Jasper, Hematite, and Quartzites)
Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)
sedimentary
Jasper / Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Jasper Pebble
Microcrystalline Quartz (Chalcedony)
sedimentary
River Cobble
Clastic Sedimentary (Quartz-rich Cobble)
sedimentary
Favosite Fossil (Calyx or Rugose Coral)
Favosites (Extinct Tabulate Coral)
sedimentary