Sandstone (Greywacke/Lithic Sandstone)
Arenite / Lithic Sandstone
sedimentary
Category
Not A Rock (Man Made Origin)
Browse not a rock (man made origin) specimens identified by the Rock Identifier community.
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Scoria (Lava Rock)
Scoria
igneous
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
sedimentary
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Tiger's Eye (Brown/Dark variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Kambaba Jasper
Stromatolite / Fossilized Algae (Rhyolitic structure)
sedimentary
Conglomerate
Conglomeratic Sandstone / Sedimentary Breccia
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Yellow Quartzite or Yellow Jasper
Quartzite (primarily SiO2 with Iron oxide staining)
metamorphic
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Dendritic Jasper
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Granitoid (Granite/Diorite)
Course-grained Plutonic Igneous Rock
igneous
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Granite Cobble
Felsic Intrusive Igneous Rock (Granite)
igneous
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Leopard Skin Jasper
Jasper (Silicon Dioxide with impurities), SiO2
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Jasper or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2)
sedimentary
Carnelian Agate (with Quartz/Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Orca Agate (Blue Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Granite
Phaneritic Igneous Rock (Granitic)
igneous
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Vesicular Basalt with Secondary Mineral Infill
Mafic Volcanic Rock (Basalt)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt (Polished Pebble)
Basalt (Mafic volcanic rock)
igneous