Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Category
Organic (Biological Organism)
Browse organic (biological organism) specimens identified by the Rock Identifier community.
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Pearl
Calcium carbonate (CaCO3) + organic conchiolin
gemstone
Pyritic Shale
Carbonaceous Shale with Iron Pyrite (FeS2)
sedimentary
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Amber
Resinite / Fossilized Tree Resin
mineral
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Chert (and Fossiliferous Limestone)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Hag Stone
Perforated Flint or Chert (SiO2)
sedimentary
Limestone with Lichen/Algae
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Amber (Copal)
Fossilized Tree Resin (C10H16O)
mineral
Fossiliferous Limestone
Calcium Carbonate - CaCO3
sedimentary
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Fossiliferous Limestone (Crinoidal)
Bioclastic Limestone (predominantly CaCO3)
sedimentary
Amber
Succinate (Fossilized Resin)
mineral
Amber
Succinicum (C10H16O)
mineral
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Amber
Succinates (C10H16O)
mineraloid
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin
gemstone
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Calclutite / Bio-calcarenite (CaCO3)
sedimentary
Limestone (Flagstone)
Fossiliferous Limestone (CaCO3)
sedimentary
Fossiliferous Rock (Invertebrate Fossil in Matrix)
Fossiliferous limestone or shaly matrix containing skeletal fossil remains
fossil
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Hag Stone (Odin Stone / Adder Stone)
Perforated Pebble (commonly Chert, Mudstone, or Limestone)
sedimentary
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Mineral (Organic Gemstone)
Amber
Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)
Organic Mineraloid