Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Category
Mineral Like Biological Tissue
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Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Tabby (Felis catus)
Felis silvestris catus (variety: Red Mackerel Tabby)
Organic/Biological specimen (Non-Mineral)
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Tufa
Calcium carbonate (CaCO3) - Porous Limestone
sedimentary
Megalodon Shark Tooth
Otodus megalodon
fossil
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Agatized fossil fragment, possibly silicified coral
Chalcedony (microcrystalline SiO₂) replacing carbonate fossil material
fossil
Weathered limestone pebble
Limestone, primarily calcite (CaCO₃)
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
fossil
Amber (Rough)
Succinite (Resinite)
gemstone
Fossiliferous Rock (Invertebrate Fossil in Matrix)
Fossiliferous limestone or shaly matrix containing skeletal fossil remains
fossil
Augite Shell / Turret Snail Fossil (or Recent Seashell)
Gastropoda (Class) / Turritellidae (Family)
fossil
Amber
Succinite (fossilized resin, C10H16O)
mineral
Fossilized Shell in Limestone
Carbonate sedimentary rock with Bivalvia or Brachiopoda remains
fossil
![Banded Iron Formation (BIF) / Tiger Iron (Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])) — metamorphic](https://media.rockidentification.com/2a815c02-b6be-44b2-aea2-3de93f046f91-thumbnail.jpg)
Banded Iron Formation (BIF) / Tiger Iron
Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])
metamorphic
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Crinozoan fossil (Crinoid stem fragment)
Crinoid (Class Crinoidea)
fossil
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Chert (Flint/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Fossilized tooth, likely mammalian molar
Indeterminate Mammalia; mineralized dentine and enamel
fossil
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Limestone with Lichen
Carbonate Sedimentary Rock (primarily CaCO3)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Silicified Snail Fossil
Gastropod (likely replaced by Chalcedony/Quartz - SiO2)
fossil
Abalone Shell / Mother of Pearl
Haliotis sp. (Nacreous shell layer)
fossil
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Amber
Succinicum (Succinite); C10H16O
Mineraloid (Organic)
Amber
Succinicum (Organic Gemstone - Resinite)
mineraloid
Amber
Succinite
Organic Mineraloid
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Orange Calcite (Iron-Stained)
Calcium Carbonate (CaCO3)
mineral
Flagstone paving (likely sandstone or limestone)
Clastic sandstone or carbonate limestone; exact identification requires testing
sedimentary
Pumice
Vesicular volcanic glass (primarily SiO2 with Al2O3)
Igneous