Quartzite Pebble (River Rock)
Metamorphic Quartzite (SiO2)
metamorphic
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Tumbled brecciated jasper (likely ocean or mahogany jasper)
Jasper—microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions
mineral
Dalmatian Stone
Aplite (often incorrectly called Dalmatian Jasper)
igneous
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Basalt (Porphyritic Basalt)
Extrusive Igneous Rock
igneous
Serpentine
Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Potassium Feldspar)
igneous
Basalt
Basalt (Mafic Extrusive)
igneous
Pumice and Scoria
Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)
igneous
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
Basalt (Greenstone/Water-worn Pebble)
Basalt (containing Chlorite/Epidote)
igneous
Fossilized Bone
Permineralized Vertebrate Bone
fossil
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Granite
Granite
Igneous
Weathered limestone or calcareous sandstone
Calcitic carbonate rock, likely limestone (CaCO₃), possibly slightly dolomitic
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite Cobble
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
River Pebble (Siltstone / Fine Sandstone)
Sedimentary Rock (siliciclastic clastic rock)
sedimentary
Hag Stone (Adder Stone / Geode-bearing Pebble)
Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Weathered Sandstone or Siltstone
Sedimentary Rock
sedimentary
Weathered granite
Granite; quartz–feldspar–mica plutonic rock
igneous
Weathered granite
Granite; interlocking quartz, feldspar, and mica minerals
igneous
Sandstone
Arenite
Sedimentary
Vuggy Quartz on Matrix
Crystalline Silicon Dioxide (SiO2)
mineral
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Unknown Rock Fragment
Unknown
unknown
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
sedimentary
Rugose Coral Fossil
Order Rugosa
fossil
Weathered granite or granitic gneiss block
Granite, chiefly quartz, feldspar, and mica; possibly gneiss if the visible banding is structural
igneous