Sandstone
Sandstone (Arenite)
sedimentary
Category
Anthropogenic Material
Browse anthropogenic material specimens identified by the Rock Identifier community.
Learn about Anthropogenic Material in the encyclopedia
View all →
Sandstone
Sedimentary Clastic Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
igneous
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Sandstone
Sedimentary quartz arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gray Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Brown Jasper / River Siltstone
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 cement)
sedimentary
Coquina or Fossilized Shell Aggregate
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Polished/tumbled unakite (probable)
Unakite; epidote + pink potassium feldspar + quartz
metamorphic
Tumbled blue-green stone, likely chrysoprase or dyed chalcedony
Cryptocrystalline quartz (SiO₂), possibly nickel-bearing chrysoprase; exact identification requires testing
gemstone
Polished ocean jasper (orbicular jasper)
Microcrystalline quartz (SiO₂), commonly with chalcedony and iron-oxide inclusions
mineral
Chert Nodule in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Amethyst quartz geode
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Flint
Microcrystalline quartz (SiO2)
sedimentary
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
sedimentary
Chert (likely flint), possibly chalcedony-rich
Microcrystalline quartz, SiO₂ (quartz/chalcedony)
sedimentary
Polished orbicular jasper / brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and clay-rich inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Diamond
C (Carbon)
gemstone
Black Granite (Basalt or Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Aquamarine-like beryl pendant
Beryl, Be₃Al₂Si₆O₁₈; the beads may be dyed or treated chalcedony/amazonite, so image-only identification is uncertain
gemstone
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary