Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Amber
Succinite (with approximate formula C10H16O)
mineraloid
Amber Dragonfly Brooch
Succinited (Baltic Amber)
fossil
Fossilized Coral in Chert
Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Limestone with Fossil Fragments
Bioclastic Limestone (CaCO3)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineraloid
Fossiliferous Limestone
Limestone with fossil bioclasts (Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinite
Organic Mineraloid
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Polished petrified wood
Silicified wood; primarily microcrystalline quartz (SiO₂) replacing woody tissue
fossil
Amber
Fossilized tree resin
gemstone
Dendritic agate cabochon
Chalcedony (microcrystalline quartz, SiO₂) with manganese-oxide dendrites
gemstone
Fossiliferous Limestone Pebble
Calcite-rich Fossiliferous Marine Limestone
fossil
Weathered limestone
Calcite-rich carbonate rock (mostly CaCO₃), possibly fossiliferous limestone
sedimentary
Quartz Vein in Sandstone
Hydrothermal Quartz (SiO2) in Arenite
sedimentary
Tumbled garnet-bearing metamorphic rock
Likely garnet schist or garnet-bearing gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃
metamorphic
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Amber
Succinite (Resin)
mineral
Kambaba Jasper
Stromatolite (fossilized algae)
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Amber
Succinite (C10H16O)
mineral
Coral Fossil
Scleractinia (Fossilized Coral)
fossil
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
fossil
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
sedimentary
Polished amber-like chalcedony (likely carnelian/ochre jasper)
Microcrystalline quartz, SiO₂; coloration likely from iron oxides/hydroxides
mineral
Spinosaurus aegyptiacus Fossil
Spinosaurus aegyptiacus (permineralized hydroxyapatite)
fossil
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Fossil bone fragment, likely vertebrate limb or rib bone
Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate
fossil
Yellow-brown translucent mineral fragment, likely citrine or amber
Quartz (SiO₂), if citrine; succinite (fossil resin), if amber
mineral
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Amber (fossilized tree resin)
Succinite; organic resin composed mainly of polymerized terpenoids
fossil
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Tumbled amber
Amber (fossilized plant resin; commonly succinite, C10H16O)
gemstone
Tumbled amber
Amber (fossilized plant resin; commonly succinite, C10H16O)
gemstone
Gastropod Fossil
Class Gastropoda (fossilized)
fossil
Fossil tooth fragment
Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image
fossil