Agate
Chalcendony (Silicon Dioxide, SiO2)
mineral
Category
Anthropogenic Sedimentary Style Organic Solid
Browse anthropogenic sedimentary style organic solid specimens identified by the Rock Identifier community.
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Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Petrified Wood
Silicified Wood (Permineralized wood)
fossil
Sea Glass
Man-made silicate glass weathering product
sedimentary
Ironstone Nodule (Ironstone Concretion)
Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)
sedimentary
Quartz Geode
Silicon dioxide (SiO2)
mineral
Tahitian black pearl strand
Cultured pearl; aragonite (CaCO₃) nacre
gemstone
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz crystals
sedimentary
Chert (Mookaite style)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Jasper (Mookaite style)
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Iron-stained sandstone or weathered ironstone
Ferruginous sandstone; chiefly quartz (SiO₂) cemented or coated by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))
sedimentary
Picasso Jasper (Picasso Stone)
Metamorphosed Calcium Carbonate (Silicified Limestone)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Tumbled Black Stone
Unknown (possibly basalt, obsidian, or black jasper)
igneous or sedimentary
Marble (Carrara style)
Recrystallized Calcite-rich Metamorphic Rock (CaCO3)
metamorphic
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2 with iron impurities)
mineral
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Clear Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
gemstone
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Angelite
Anhydrous Calcium Sulfate (CaSO4)
mineral
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Red Jasper or Ironstone concretion
SiO2 or Fe2O3
sedimentary or mineral
Decorative mosaic cross containing mixed rock and glass fragments
Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Sea Glass
Man-made silicate glass
sedimentary
Red jasper flint/chert knapped point
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide coloration
mineral
Amber
Fossilized Tree Resin
gemstone
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Agate / Banded Chalcedony
Agate (Silicon Dioxide / SiO2)
mineral
Geode (unopened)
Silica-filled Concretion (SiO2)
sedimentary
Banded Calcite (often sold as Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary