Amethyst Geode
Amethyst (Silicon Dioxide, SiO2 with iron impurities)
mineral
Category
Anthropogenic Sedimentary Style Organic Solid
Browse anthropogenic sedimentary style organic solid specimens identified by the Rock Identifier community.
Learn about Anthropogenic Sedimentary Style Organic Solid in the encyclopedia
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Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Quartz Geode
Silicon dioxide (SiO2)
mineral
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Tahitian black pearl strand
Cultured pearl; aragonite (CaCO₃) nacre
gemstone
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
gemstone
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Banded Calcite (often sold as Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Agate / Banded Chalcedony
Agate (Silicon Dioxide / SiO2)
mineral
Angelite
Anhydrous Calcium Sulfate (CaSO4)
mineral
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Mookaite style)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Jasper (Mookaite style)
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Sea Glass
Man-made silicate glass
sedimentary
Marble (Carrara style)
Recrystallized Calcite-rich Metamorphic Rock (CaCO3)
metamorphic
Hand-Drawn Gengar Pokémon Card Artist Item
Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)
Organic (Paper and Cellulose)
Chert (Yellow Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper or Ironstone concretion
SiO2 or Fe2O3
sedimentary or mineral
Amber
Fossilized Tree Resin
gemstone
Geode (unopened)
Silica-filled Concretion (SiO2)
sedimentary
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2)
mineral
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Amethyst Geode
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Sedimentary
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone