Granite (River Cobble)
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Category
Igneous Or Sedimentary (Water Worn)
Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.
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Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper and Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz variety
sedimentary
Chert / River Stone
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Painted River Rock
Painted Quartzite or Smooth Siltstone
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian pebbles)
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony (Common Agate pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
mineral
Chert (River Cobble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Greenstone / Greenschist
Metamorphosed mafic igneous rock (Greenschist facies)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Mafic Extrusive Igneous Rock
igneous
Basalt Pebble
Basalt (SiO2 range 45-52%)
igneous
Basalt River Stone
Aphanitic Mafic Volcanic Rock
igneous
Unakite-veined Granite / Epidotized Granite
Epidotized Granite (FeCu2Al2(Si2O7)(SiO4)(OH)2)
igneous
Black River Stone (likely Basalt or Chert)
Basalt (primarily Plagioclase Feldspar and Pyroxene)
igneous
Granite Water-Worn Pebble
Felsic intrusive igneous rock (Granite)
igneous
Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite
Silicate rock with contrasting xenolith/inclusion
igneous
River Stone (Grey Andesite)
Intermediate extrusive volcanic rock (Andesite)
igneous
River Stone (Basalt or fine-grained Schist)
Mafic Igneous Rock / Volcanic Basalt
igneous
Olivine (Peridotite / Dunite Pebble)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Chert (or Jasper)
Silicon dioxide (SiO2)
sedimentary
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Basalt (Vesicular or Weathered)
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Banded / Brecciated Jasper Pebble)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Granite
Phaneritic intrusive igneous rock (primarily SiO2)
igneous
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Pink Granite Cobble
Phaneritic Felsic Plutonic Rock (Granite)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral