Red Jasper (beads)
SiO₂ (Silicon Dioxide)
Mineral, variety of chalcedony (microcrystalline quartz)
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
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Polished moss agate
Moss agate, a variety of chalcedony (microcrystalline quartz, SiO₂)
gemstone
Amber
Succinate (Fossilized Tree Resin)
fossil
Limestone Pebble
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Likely coal (possibly anthracite)
Coal, composed chiefly of carbon-rich organic matter; rank cannot be confirmed from the photograph
sedimentary
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Fossil Coral (Honeycomb Coral)
Favosites (extinct genus of Tabulate coral)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Plume Agate
Cryptocrystalline Quartz (SiO2)
Mineral/Gemstone
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Chert (River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Quartz Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Possible fossilized ammonite or concretion
Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock
fossil
Tahitian black pearl strand
Cultured pearl; aragonite (CaCO₃) nacre
gemstone
Banded agate (likely petrified wood or silicified sediment)
Microcrystalline quartz/chalcedony, SiO₂; possible silicified wood
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Crinoid Fossil in Limestone
Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)
sedimentary
Jasper Agate
Silicon dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Jasper or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Amber
Amber (C10H16O)
mineral
Chert (often called Jasper or River Rock)
Chert (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Fossiliferous Limestone (Crinoid stem)
CaCO3 (Calcium Carbonate) with Fossil Inclusions
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Mineral (Organic Gemstone)
Chert (Jasper/Flint variant)
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Nephrite Jade
Nephrite
Mineral/Rock
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
sedimentary