Sandstone (Calcareous/Lithic)
Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)
sedimentary
Category
Man Made Material (Anthro Lithic Product)
Browse man made material (anthro lithic product) specimens identified by the Rock Identifier community.
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Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Banded sandstone pebble
Quartz-rich sandstone, likely with a contrasting siltstone or fine-grained sandstone band
sedimentary
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
mineral
Chert (specifically Flint or Novaculite variant)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Uncertain polymict breccia or altered volcanic rock
Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing
igneous
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Slate
Metamorphic rock (fine-grained, foliated)
metamorphic
Sandstone (lithic/quartz variant)
Clastic sedimentary rock (SiO2 predominant)
sedimentary
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
mineral
Red Sandstone
Sandstone (lithic arenite or arkose with iron oxide)
sedimentary
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Chert (and Chert Flake)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Porphyritic polymictic breccia (likely volcanic breccia)
Volcanic breccia; probable polymictic andesite–dacite breccia with quartz/feldspar clasts
igneous
Weathered quartz-rich rock fragment
Likely quartz-bearing feldspathic rock; exact identification requires testing
mineral
Coquina
Bioclastic Limestone
sedimentary
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Chert (Banded)
Cryptocrystalline Silica (SiO2)
sedimentary
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Pumice
Pumice (Volcanic Glass)
igneous
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Gold (Elemental Metal)
Gold (Au)
Mineral
Chert (often found as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered, iron-stained quartz-rich pebble (uncertain identification)
Microcrystalline quartz, SiO₂, with iron-oxide/hydroxide staining and dark matrix inclusions
mineral
Possible weathered metal-rich rock or slag fragment
Uncertain; possibly iron-oxide-rich breccia or industrial slag
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral