Petrified Coral (Agatized Coral)
Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)
fossil
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil
Amber (fossilized tree resin)
Fossilized plant resin; commonly succinite (not a mineral, largely organic polymer)
fossil
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Fossilized Brachiopod
Phylum Brachiopoda
fossil
Quartz (Grain/Fragment)
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth (Carcharocles/Otodus or Sand Tiger Shark Tooth)
Elasmobranchii (Fossilized Tooth)
fossil
Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Plioplatecarpus)
fossil
Banded Agate with Drusy Quartz
Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz
mineral
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)
sedimentary
Yellow-orange amber
Fossilized tree resin; amber is an organic mineraloid, not a true mineral
fossil
Amber (likely rough amber or copal)
Fossilized tree resin; chiefly an organic polymer with terpenoid remnants
gemstone
Amber
Fossilized plant resin; primarily organic terpenoid compounds (not a mineral)
gemstone
Fossilized coral (likely honeycomb or branching coral)
Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃
fossil
Fossiliferous Chert (Brachiopod/Bryozoan Fossil)
Microcrystalline quartz (SiO2) with fossil inclusions
sedimentary
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Amber
Succinurite (C10H16O)
mineraloid
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Fossiliferous Sandstone
Fossiliferous Arenite
sedimentary
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Tumbled amber
Amber (fossilized plant resin), primarily cross-linked diterpenoid organic compounds
gemstone
Fossil-bearing limestone
Bioclastic limestone, likely containing bivalve or brachiopod impressions
fossil
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Red Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone / Quartzite
Sedimentary quartz arenite
sedimentary
Tumbled amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid
gemstone
Amber (likely beach-worn amber or resinous material)
Fossilized plant resin; predominantly organic terpenoid polymers (succinite)
gemstone
Weathered sandstone (probable)
Quartz-rich sandstone, largely composed of cemented quartz grains (SiO₂)
sedimentary
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Polished Baltic amber with insect inclusion
Amber (fossilized plant resin), chiefly polymerized diterpenoid resin; likely succinite
gemstone
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Fossilized Mammoth Tooth Fragment
Mammuthus primigenius (or Mammuthus sp.)
fossil
Unakite
Unakite (Epidotized Granite)
metamorphic
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. indet.
fossil
Sandstone
Arenite (SiO2 primarily)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary