River Stone (Basalt)
Extrusive Igneous Rock (Mafic)
igneous
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
Learn about Not A Rock (Man Made Polymer) in the encyclopedia
View all →
Basalt (River Rock)
Basalt
igneous
Basalt River Stone
Basalt (Mafic volcanic rock)
igneous
Basalt Pebble
Basalt
igneous
Vesicular Basalt (Scoria)
Mafic Igneous Volcanic Rock
igneous
Vesicular Basalt (Amygdaloidal Basalt)
Basalt with Secondary Mineral Inclusions
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt River Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
Vesicular Basalt (or Scoria)
Basalt (Aphanitic-Vesicular Mafic Igneous Rock)
igneous
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Basalt (extrusive volcanic rock)
igneous
Basalt (Beach Pebble)
Basalt
igneous
Basalt (with possible fine-grained mineralization)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Red Agate
Chalcedony (SiO2)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone with Manganese Staining
Quartz Arenite / Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)
sedimentary
Chalcedony / Quartz Nodule (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Quartz variety, SiO2)
mineral
Banded Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2)
sedimentary
Tumbled Agate Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite (River Cobble)
Metamorphic Quartzite (SiO2)
metamorphic
Chalcedony (Yellow Agate / Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
River Pebble (Sandstone)
Quartz-rich Sandstone Pebble
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Granite / Feldspar gravel
Granite (felsic intrusive igneous rock)
igneous
Yellow Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Gray Pebble (Graywacke / Basalt)
Graywacke (or fine-grained Basalt)
sedimentary
Unakite / Red Jasper beach pebble
Altered Granite (Epidotized Feldspar and Quartz)
metamorphic
Sandstone (with Chert/Quartzite nodules)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
Puddingstone (Polished Pebble)
Conglomerate (Quartz-rich)
sedimentary
Quartzite Cobble (Iron-stained)
Quartzite (SiO2)
metamorphic
Yellow Jasper (Chert) Pebble
Silicon Dioxide (SiO2) with Iron Oxides
sedimentary
Red Sandstone
Sandstone (hematitic/iron-rich quartzite or arenite)
sedimentary
Unakite / Feldspar Veined Metamorphic Pebble
Metamorphic Rock with K-Feldspar, Epidote, and Quartz
metamorphic