Chert (Nodule)
Chert (Silica, SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
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Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
CaCO3 (principally Calcite)
sedimentary
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Diamond and Sapphire
Carbon (Diamond, C) and Aluminum Oxide (Sapphire, Al2O3)
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Ironstone (Limonitic/Hematitic Sandstone)
Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))
sedimentary
Dacite
Dacite (intermediate volcanic rock high in silica)
igneous
Quartzite
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Quartz Pebble (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Diamond (in jewelry setting)
Cubic Carbon (C)
mineral
Weathered agate or chalcedony nodule
Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining
mineral
Chert (Flint)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Granodiorite
Granodiorite (Na,Ca)(Al,Si)4O8
igneous
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (C)
mineral
Chert (varietal Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Likely weathered river pebble
Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert
sedimentary
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Pegmatite or Graphic Granite
Intrusive Igneous Rock
igneous
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Sandstone (Red/Brown)
Arenite (SiO2 dominated with iron oxides)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Asphalt Concrete (Bituminous Concrete)
Bituminous aggregate
sedimentary
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary