Fossiliferous Limestone / Fossil Fragment
Calcium Carbonate Matrix with Biogenic Inclusions (CaCO3)
fossil
Category
Organic (Biological Specimen)
Browse organic (biological specimen) specimens identified by the Rock Identifier community.
Fossiliferous limestone, possibly a weathered shell or bone fragment
Calcite (CaCO₃) fossil material in limestone; exact fossil identification is uncertain from the image
fossil
Amber
Succinite (Fossilized Tree Resin)
fossil
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Organic Gemstone (often associated with Sedimentary sequences)
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Fossiliferous Brachiopod in Shale
Brachiopoda (Phylum) preserved in Carbonaceous Shale
sedimentary
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Kidney Stone
Calcium oxalate, uric acid, struvite, or cystine
mineral
Chert (Flint Nodules)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Fossiliferous Limestone
CaCO3 (with biological inclusions)
sedimentary
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Fossiliferous Shale Matrix
Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Carved red coral bead (likely coral or coral-colored resin)
Corallium spp. (precious coral; calcium carbonate, CaCO₃)
gemstone
Amber
Succinite (Fossilized Tree Resin)
gemstone
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil
sedimentary
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Abalone Shell / Mother of Pearl
Haliotis sp. (Nacreous shell layer)
fossil
Amber
Succinite
Mineraloid
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Amber
Amber (C10H16O)
mineral
Seashell fragment
Calcium carbonate (CaCO3)
Biogenic material
Tahitian Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Fossiliferous limestone
Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing fossil fragments—possibly coral or bryozoan
fossil
Amber
Succinite (approximate formula C10H16O)
mineraloid
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Anthropogenic Sedimentary-style Organic Solid
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (C10H16O)
mineral
Amber
Fossilized Resin (C10H16O)
mineral
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Chert (Siliceous Mudstone variant)
Microcrystalline quartz (SiO2)
sedimentary
Amber
Succinite (organic fossilized resin)
mineraloid
Amber
Succinate (Organic Fossilized Resin)
mineraloid
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil