Sandstone
Arenite (SiO2 principal composition)
sedimentary
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Sandstone
Arenite (SiO2 based)
sedimentary
Crinoid Fossil in Chert
Crinoid (Class Crinoidea) in Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Granite Pebble
Granite (phaneritic igneous rock)
igneous
Gneiss
Gneiss
metamorphic
Sandstone (Water-worn pebble)
Arenite (primarily SiO2)
sedimentary
Pink Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Quartzite river pebble
Recrystallized Quartz (SiO2)
metamorphic
Limestone (specifically Carboniferous Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Plutonic Granite (Water-worn Pebble)
Granite
igneous
Gneiss (Gneissic Granite)
Gneiss
metamorphic
Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chert (River Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Banded Gneiss
Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)
metamorphic
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Sandstone (River Cobble)
Sandstone (primarily composed of silica, SiO2)
sedimentary
Granite Cobble
Granite (Felsic intrusive igneous rock)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Gneiss
Gneiss
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with inclusions
Quartzite (SiO2)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Black Jasper (Etched)
Silicon Dioxide (SiO2) with impurities
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (Complex rock consisting primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2)
metamorphic
Carnelian
Carnelian (Silicate mineral, SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Blue Lace Agate
Banded Chalcedony (SiO2)
mineral
Basalt (with possible Calcite/Quartz veining)
Afanitic Mafic Igneous Rock
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral