Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Category
Organic (Anthropogenic)
Browse organic (anthropogenic) specimens identified by the Rock Identifier community.
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Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone (containing Fossil Mold)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Mineral
Amber
Succinite (fossilized resin)
mineral
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Amber
Succiniferous fossil resin (C10H16O)
mineral
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Amber
Succinite (Formula: C10H16O)
mineral
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Green Moss Agate
Silicon Dioxide with inclusions (SiO2)
sedimentary
Amber
Fossilized Tree Resin (Succinate)
mineral
Zebra Marble
Metamorphosed Limestone (Recrystallized Calcite)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
South Korean 100 Won Coin (Cupronickel)
Cupronickel Alloy (75% Cu, 25% Ni)
mineral-based alloy (anthropogenic)
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Ironstone Nodules in Chalk/Limestone
Limonite/Goethite concretions (FeO(OH)·nH2O) in Calcium Carbonate matrix (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (Permineralized organic tissue)
fossil
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Organic Inclusions
fossil
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Coal
Bituminous Coal (organic sedimentary rock)
sedimentary
Weathered River Rock (likely Chert or Basalt with algae)
Silicon dioxide (SiO2) with organic biofilm
sedimentary
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Bituminous Coal
Bituminous coal (Organic Sedimentary Rock)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Ambergris
Ambergris (Coprolite-adjacent organic substance)
Organic (Geological interest)
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral