Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Dyed mineral cluster, likely calcite or aragonite
Calcite (CaCO₃) or aragonite (CaCO₃), artificially color-enhanced
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Polished orbicular/porphyritic granite or breccia
Likely potassium-feldspar–quartz granite with amphibole/biotite and epidote; exact variety uncertain from the image
igneous
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Opalite
Synthetic Opalized Glass (SiO2 + additives)
mineraloid (man-made)
Green glassy slag or manufactured glass bead
Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polished mahogany obsidian (probable)
Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite
igneous
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial byproduct)
mineraloid
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Opalite
Man-made Glass (Synthetic Opalized Glass)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Opalite
Synthetic Opalite Glass
mineraloid (man-made)
Limonite (Iron Ore)
Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O
mineral
Granite
Granite (a plutonic rock)
Igneous
Green Slag
Anthropogenic Silicate Glass
Mineraloid (Industrial byproduct)
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Chert (Lithic Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
mineral
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Chert / Flint
Silicon dioxide (SiO2)
sedimentary
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Concrete fragment or Conglomerate
Artificial Conglomerate (Concrete) or Natural Conglomerate
sedimentary
Likely tumbled jasper or iron-stained quartzite
Microcrystalline quartz (SiO₂), possibly quartzite with iron-oxide inclusions
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Terrazzo flooring containing marble aggregate
Marble (recrystallized calcite, CaCO₃) aggregate in cementitious terrazzo
metamorphic
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Limonite (Iron Stone/Goethite)
Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))
mineral
Flint or chert
Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular
sedimentary
Blue calcite sphere
Calcite (CaCO₃), commonly blue-calcite variety
mineral
Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary