Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Category
Anthropogenic Material
Browse anthropogenic material specimens identified by the Rock Identifier community.
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Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Porphyritic Rhyolite (Birdseye Rhyolite)
Rhyolite (Porphyritic texture)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Granite
Granite
Igneous
Quartzite Geode or Crystalline Quartz Node
Silicon Dioxide (SiO2)
metamorphic
Green Turban Shell (Polished)
Turbo marmoratus (Aragonite/Calcite)
mineral
Amber
Succinite
Mineraloid
Fossilized Gastropod Internal Mold
Steinkern (Mollusca: Gastropoda)
sedimentary
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Faceted gemstone in a jewelry setting
Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone
gemstone
Unidentified dark rock fragment
Likely fine-grained mafic mineral aggregate; exact identification requires testing
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Asphalt Concrete
Bituminous conglomerate
sedimentary
Weathered quartz-rich pebble, possibly granitic gneiss
Quartz–feldspar–mica aggregate; likely granitoid or gneiss
metamorphic
Unidentified gray rock fragment
Indeterminate from image; possibly quartz- or feldspar-rich silicate material
mineral
Diamond
Carbon (C)
gemstone
Meteorite
Chondrite / Iron-Nickel Meteorite fragment
meteorite
Chert (or potentially massive Quartz/Quartzite)
SiO2 (Silicon Dioxide)
sedimentary (if chert) / metamorphic (if quartzite)
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Serpentinite (probable)
Serpentinite, dominated by serpentine-group minerals (chrysotile, lizardite, or antigorite), commonly with magnetite
metamorphic
Small dark metallic-looking rock fragment
Undetermined; possibly iron oxide-rich material or a metallic mineral
mineral
Weathered vesicular stone, possibly pumice or scoria
Vesicular volcanic rock; likely pumice (highly vesicular rhyolitic material) or scoria (basaltic material)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Blue glass-like bead or gemstone keychain ornament
Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image
gemstone
Flint / Chert Pebble
Cryptocrystalline quartz (SiO2)
sedimentary
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Honey-colored chalcedony (possibly yellow/orange agate or carnelian)
Chalcedony, a microcrystalline variety of quartz; SiO₂. The color may result from iron-oxide inclusions. Exact identification is uncertain from a photograph alone.
gemstone