Fossilized Brain Coral
Diploria labyrinthiformis (Fossilized)
sedimentary
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
Learn about Organic (Paper And Cellulose) in the encyclopedia
View all →
Amber
Succinite (a common variety of fossilized resin)
mineral
Amber
Succinite (C10H16O)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)
mineral
Amber
Succinite
mineraloid
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)
Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite
Mineral (variety of Chalcedony)
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
sedimentary
Elephant Skin Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (with Quartz Vein)
Microcrystalline Silica (SiO2)
sedimentary
Moss Agate with Quartz Druzy
Chalcedony with inclusions (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Tumbled amber
Amber (fossilized plant resin), chiefly polymerized diterpenoid resin
gemstone
Amber (or polished Chalcedony bead)
Fossilized Tree Resin / SiO2 (Silicon Dioxide if Chalcedony)
gemstone
Amber / Copal
Succinite (fossilized resin)
mineraloid
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Fossilized Shark Tooth
Scapanorhynchus (Sand Tiger Shark relative)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Gastropod Fossil (Internal Mold)
Phylum Mollusca, Class Gastropoda (Steinkern)
sedimentary
Fossilized coral (likely honeycomb or branching coral)
Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃
fossil
Banded Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Chert (Tan/Buff Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone (with Moss/Lichen Growth)
Sandstone (Quartz Arenite / Lithic Arenite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Hag Stone
Perforated Flint / Chert Node
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii (fossilized tooth)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary