Sandstone
Clastic Sedimentary Rock
Category
Browse antropogenic (man made glass byproduct) specimens identified by the Rock Identifier community.
Sandstone
Clastic Sedimentary Rock
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz Boulder
Silicon Dioxide (SiO2)
Quartz pebble
Silicon dioxide (SiO2)
Sandstone
Clastic sedimentary rock
Sandstone
Clastic Sedimentary Rock
Microcline Feldspar
KAlSi3O8
Orthoclase Feldspar (Granitic)
KAlSi3O8 (Potassium Feldspar)
Milky Quartz/Yellow Quartz
Silicon Dioxide (SiO2)
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
Quartzite Pebble
Quartzite (SiO2)
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
Sandstone
Arenite
Sandstone
Arenite (SiO2 based)
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Sandstone (Quartzose)
Arenite (SiO2 based)
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
Quartzite Pebble
Quartzite (primarily SiO2)
Sandstone (likely with Quartz Veining)
Arenite (primarily SiO2)
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
Sandstone (Pebble)
Arenite (SiO2 based)
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
Peridot
Olivine ((Mg,Fe)2SiO4)
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
Chalcedony (likely common gray chalcedony)
Microcrystalline quartz, SiO₂
Weathered sandstone or siltstone
Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, iron oxides, or carbonate
Olivine (Peridotite / Dunite Pebble)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
Quartz Crystal Cluster in Matrix
Silicon Dioxide (SiO2)
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
Granitoid (Common Granite/Gneiss)
Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)
Quartz Vein in Gneiss or Schist
Silicon dioxide (SiO2) within metamorphic host rock
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartzite Pebble
Quartzite (mostly SiO2)
Rose Quartz
Silicon dioxide (SiO2)
Quartz Sand Gravel
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Polished carnelian
Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)
Smoky quartz-bearing pegmatitic rock
Quartz, SiO₂, likely with feldspar and mica inclusions
Tumbled black stone, likely basalt or black jasper
Probably basalt (fine-grained plagioclase–pyroxene rock); exact identification is uncertain from the image
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4