Chert (Nodule)
Microcrystalline Quartz (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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Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Crushed Granite Gravel
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Pumice
Pumice (a highly vesicular extrusive volcanic rock)
igneous
Hoodoo (Limestone / Siltstone Formation)
Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Stone
Quartzite (SiO2)
metamorphic
Red Sandstone
Arenite with Hematite (Fe2O3)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Yellow Chert (Chert/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Chert (composed primarily of Microcrystalline Quartz, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Pegmatite (Granitic Pegmatite with Quartz, Feldspar, and Mica)
Granitic Pegmatite
igneous
Chert Concretion
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Sandstone (enriched with Iron Oxide)
sedimentary
Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Dacite
Dacite (intermediate volcanic rock)
igneous
Tumbled blue sodalite (probable)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Red synthetic corundum (ruby-colored lab-grown sapphire)
Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored
gemstone
Pink Granite / Potassium Feldspar with Quartz
Granite (composed mainly of Orthoclase KAlSi3O8 and Quartz SiO2)
igneous
Agate
Chalcedony (SiO2) with impurities
sedimentary
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Tumbled brown translucent stone, likely quartz/jasper
Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony or jasper
mineral
Quartzite Fragment
Crystalline Silicon Dioxide (SiO2)
metamorphic
Basalt
Basalt
igneous
Sandstone (Greywacke/Lithic Sandstone)
Arenite / Lithic Sandstone
sedimentary
Chert (Flint Nodules)
Microcrystalline silica (SiO2)
sedimentary
Ferruginous Quartzite (Red Sandstone/Quartzite)
Quartzite with Iron inclusions (SiO2 + Fe2O3)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Agate (Thunderegg segment)
Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony
mineral
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary