Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Category
Sedimentary (Fossilized)
Browse sedimentary (fossilized) specimens identified by the Rock Identifier community.
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Petoskey Stone
Hexagonaria percarinata
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Dendritic Agate (Montana Moss Agate)
Silicon Dioxide (SiO2) - Chalcedony with Manganese/Iron inclusions
mineral
Dragon Blood Jasper (also known as Dragon Stone)
Epidotized septarian concretion or Jasper/Epidote breach (typically a combination of Epidote and Pietersite or Red Jasper)
metamorphic
Fossilized Syringopora Coral (Organ Pipe Coral Fossil)
Syringopora sp. (Class Anthozoa, Order Tabulata)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Fossilized tooth, likely mammalian molar
Indeterminate Mammalia; mineralized dentine and enamel
fossil
Fossilized Shark Tooth (Drum Fish Tooth/Pavement Tooth)
Sparidae or Sciaenidae (Crushing plate dental fossil)
fossil
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil
Fossilized Sand Tiger Shark Tooth
Carcharias sp. (likely Carcharias taurus or Striatolamia)
fossil
Tumbled amber-like inclusion
Likely amber (fossilized tree resin; complex polymer), but identification is uncertain from the image
gemstone
Fossil Coral
Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)
fossil
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Petoskey Stone
Hexagonaria percarinata (Calcite / CaCO3)
fossil
Fossilized echinoid (sea urchin), likely a flint/chalk-associated test
Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)
fossil
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata
fossil
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
fossil
Fossilized Gryphaea (Devil's Toenail)
Gryphaea arcuata (Bivalvia: Gryphaeidae)
fossil
Amber
Succinite (approximate formula C10H16O)
mineral
Amber
Succinite (C10H16O)
mineral
Mookaite Jasper
Siliceous sedimentary rock (variety of Jasper/Chert)
Sedimentary Rock
Amber
Succinite
mineral
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Fossil Coral
Phylum Cnidaria / Scleractinia
fossil
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)
mineral
Crinoid Fossil Fragment
Crinoid stem fossil (Echinodermata)
fossil
Amber
Succinite (organic mineraloid); Chemical formula: C10H16O
mineral
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
Mineraloid
Tooth or shell fragment (likely fossilized marine material)
Indeterminate; possibly a fossil fish tooth or mollusk shell fragment composed mainly of calcium carbonate (CaCO₃)
fossil
Amber
Fossilized tree resin (not a true mineral as it is organic and amorphous); Chemical formula is highly variable, but often approximated as C10H16O.
Mineral
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Fossil shell fragment, likely brachiopod or bivalve
Indeterminate fossilized carbonate shell; possibly Spiriferida (brachiopod)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Coral Fossil (Petoskey-style or Colonial)
Hexagonaria percarinata (Order: Rugosa)
fossil
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (C10H16O)
Organic Mineraloid
Amber
Succinite (Formula: C10H16O)
mineral
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral