Sandstone
Arenite (SiO2 based)
sedimentary
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
White Quartzite
Quartzite (primarily SiO2)
metamorphic
Limonite stained Sandstone
Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Conglomerate
Clastic sedimentary rock (Polymictic Conglomerate)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Banded Gneiss
Gneiss (quartz-feldspar-biotite metamorphic rock)
metamorphic
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Banded Agate
Silicon Dioxide (SiO2)
mineral
Chert (specifically Gray/Tan Bedded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt River Pebble
Basalt
igneous
Basalt
Basalt (Mafic Extrusive)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Granite (a felsic intrusive igneous rock)
Igneous
Serpentinite
Serpentinite ((Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Basalt
Basalt
igneous
Grey Basalt Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt River Stone
Basalt
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Extrusive mafic igneous rock
igneous
Greywacke with Quartz Vein
Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite with Quartz Veins
Quartzite (chiefly SiO2)
metamorphic
Basalt
Basalt (composition: Plagioclase, Pyroxene, and Olivine)
igneous
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Basalt (Crushed Stone Aggregate)
Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)
igneous
Basalt River Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Unakite
Unakite (Metasomatized Granodiorite)
metamorphic
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous