Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Calcium carbonate matrix with macrofossils (CaCO3)
fossil
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Bamboo Leaf Jasper
Silicified Siltstone or Jasper (SiO2)
sedimentary
Coprolite
Fossilized feces
fossil
Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Amber
Succinite (Fossilized Tree Resin)
gemstone
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Likely fossil shell fragment
Indeterminate mollusk fossil; possibly a gastropod or bivalve in limestone
fossil
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Fossilized Chiton (Polyplacophora)
Polyplacophora (fossilized valves)
mineralized fossil
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Amber
Succinite (fossilized resin)
mineral
Limestone with Fossil Inclusion
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone with Vug
Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Limestone and Sandstone Assortment
Sedimentary Rock Assemblage
sedimentary
Fossiliferous Limestone
Calcium carbonate (CaCO3) with fossil inclusions
sedimentary
Shark Tooth Fossil Matrix
Carcharocles / Otodus species embedded in sedimentary matrix
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Limestone Pebble
Calcareous sedimentary rock (CaCO3)
sedimentary
Orgonite Pyramid with Amethyst and Quartz
Silicon dioxide (Quartz/Amethyst) embedded in resin with metal shavings
gemstone
Fossilized Bone
Permineralized Dinosaur or Megafauna Bone
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Shark Tooth Fossil
Chondrichthyes fossil
fossil
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Red coral beads (possibly dyed or imitation coral)
Corallium spp. skeleton, composed mainly of calcium carbonate (calcite); exact material cannot be confirmed from the image
gemstone
Shark Tooth Fossil
Chondrichthyes tooth fossil
fossil
Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Amber
Fossilized Tree Resin
gemstone
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary