Rock Identifier

Category

Mineral Like Biological Tissue

Browse mineral like biological tissue specimens identified by the Rock Identifier community.

Natural Pearl (appearing in a jewelry setting) (Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin) — mineral

Natural Pearl (appearing in a jewelry setting)

Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin

Pearl (Biogenic CaCO3 (Aragonite)) — mineral

Pearl

Biogenic CaCO3 (Aragonite)

Weathered Sandstone with Algae Growth (Arenite) — sedimentary

Weathered Sandstone with Algae Growth

Arenite

Pearl (Calcium carbonate (CaCO3) as Aragonite or Calcite) — mineral

Pearl

Calcium carbonate (CaCO3) as Aragonite or Calcite

Baroque Pearl (Biogenic Calcium Carbonate (Aragonite/Conchiolin)) — mineral

Baroque Pearl

Biogenic Calcium Carbonate (Aragonite/Conchiolin)

Tufa (Calcareous Tufa (CaCO3)) — sedimentary

Tufa

Calcareous Tufa (CaCO3)

Dendritic Limestone (Calcite with Manganese Oxide (Manganese Dendrites)) — sedimentary

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Precious Red Coral (Corallium rubrum / Corallium japonicum) — mineral (organic gemstone)

Precious Red Coral

Corallium rubrum / Corallium japonicum

mineral (organic gemstone)

Pearl (Calcium Carbonate (Aragonite and Calcite), CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite and Calcite), CaCO3

Pearl (incorporated into jewelry) (Aragonite and Calcite (CaCO3)) — mineral

Pearl (incorporated into jewelry)

Aragonite and Calcite (CaCO3)

Fossiliferous Rock (likely Dinosaur Fossil in Matrix) (Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)) — sedimentary

Fossiliferous Rock (likely Dinosaur Fossil in Matrix)

Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)

Amber (Succinite (organic hydrocarbon)) — mineraloid

Amber

Succinite (organic hydrocarbon)

Dinosaur Bone (Gembone) (Agatized Dinosaur Bone (Silicified Paleo-osteoid)) — metamorphic

Dinosaur Bone (Gembone)

Agatized Dinosaur Bone (Silicified Paleo-osteoid)

Amber (Copal) (Succinite (fossilized tree resin)) — mineral

Amber (Copal)

Succinite (fossilized tree resin)

Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

Sandstone with Algae Growth (Arenite with Chlorophyta/Lichen) — sedimentary

Sandstone with Algae Growth

Arenite with Chlorophyta/Lichen

Biological Bone (Patella/Knee) (Patella (part of the Human Skeletal System)) — Organic Structure (Not a Rock)

Biological Bone (Patella/Knee)

Patella (part of the Human Skeletal System)

Organic Structure (Not a Rock)

Amber (Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)) — Organic Mineraloid

Amber

Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)

Organic Mineraloid

Pearl (Organic Mineraloid (CaCO3 + Conchiolin)) — mineral

Pearl

Organic Mineraloid (CaCO3 + Conchiolin)

Limonite (Hydrated Iron Oxide / Bog Iron) (FeO(OH)·nH2O) — Mineral (Sedimentary context)

Limonite (Hydrated Iron Oxide / Bog Iron)

FeO(OH)·nH2O

Mineral (Sedimentary context)

Amethyst (Amethyst (Silicon Dioxide, SiO2 + Fe)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe)

Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Pearl (Aragonite / Calcium Carbonate (CaCO3)) — mineral

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Pearl (Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite) — mineral

Pearl

Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite

Pearl (Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)) — mineral

Pearl

Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)

Sandstone concretion (Ironstone-stained) (Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)) — sedimentary

Sandstone concretion (Ironstone-stained)

Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)

Sandstone (with Lichen) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Black Freshwater Pearls (Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3) — mineral

Black Freshwater Pearls

Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Rough Amber (likely Copal or immature Amber) (Organic gemstone / Succinite (if Baltic)) — mineral

Rough Amber (likely Copal or immature Amber)

Organic gemstone / Succinite (if Baltic)

Pearl (Aragonite (CaCO3 with conchiolin)) — mineral

Pearl

Aragonite (CaCO3 with conchiolin)

Pearl (Biogenic Mineraloid) (Calcium carbonate (Aragonite) and Conchiolin, CaCO3) — mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Megalodon Shark Tooth Fossil (Otodus megalodon (fossilized in sedimentary matrix)) — sedimentary

Megalodon Shark Tooth Fossil

Otodus megalodon (fossilized in sedimentary matrix)

Amber (Succinite) — mineraloid

Amber

Succinite

Aragonite (Star Cluster or Twinned variety) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite (Star Cluster or Twinned variety)

Aragonite (Calcium Carbonate, CaCO3)

Chert Nodule (Fossiliferous Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (Fossiliferous Chert)

Microcrystalline Quartz (SiO2)

Red Moss Agate (Jasper) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Moss Agate (Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Pearl (Calcium Carbonate (Aragonite) - CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite) - CaCO3

Pearl (as a Biogenic Mineral) (Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3) — mineral

Pearl (as a Biogenic Mineral)

Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3

Amber (in Matrix/Shale) (Amber (Fossilized Tree Resin)) — mineral

Amber (in Matrix/Shale)

Amber (Fossilized Tree Resin)