Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Basalt
Basalt (composition of Plagioclase feldspar and Pyroxene)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Limestone
Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Basalt with Vesicles
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Mafic volcanic rock (Silicon dioxide 45-52%)
igneous
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Basalt
Basalt (Mafic Volcanic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
River Rock (Quartzite)
Quartzite (SiO2)
metamorphic
Porphyritic Basalt (or Andesite) Pebble
Porphyritic Mafic Volcanic Rock
igneous
Granite
Plutonic felsic igneous rock
igneous
Basalt
Basalt (extrusive volcanic rock)
igneous
Basalt
Extrusive Mafic Igneous Rock
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Granodiorite
Granodiorite
igneous
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral