Rock Identifier

Category

Biogenic Material

Browse biogenic material specimens identified by the Rock Identifier community.

Learn about Biogenic Material in the encyclopedia

Peat

Diatomite

Dunite

Limonite

Shell Opal

Madagascar Opal

Lavender Obsidian

Electric Blue Obsidian

Orange Obsidian

Diamond

Metarhyolite

Rhodochrosite

Mookaite Jasper (SiO2) — Sedimentary

Mookaite Jasper

SiO2

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

Pearl (incorporated into jewelry)

Aragonite and Calcite (CaCO3)

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

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Sea Snail Shell (Top Shell) (Trochidae family (Calcium Carbonate, CaCO3)) — mineral

Sea Snail Shell (Top Shell)

Trochidae family (Calcium Carbonate, CaCO3)

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

Pearl

Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Pearl (Pendant) (Calcium Carbonate (Aragonite/Calcite) - CaCO3) — gemstone

Pearl (Pendant)

Calcium Carbonate (Aragonite/Calcite) - CaCO3

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

Pearl

Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)

Human Skin (Epidermis/Dermis) (Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)) — Mineral-like biological tissue

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue

Polished/tumbled chert or jasper pebble (Microcrystalline quartz (SiO₂), likely brown jasper/chert) — sedimentary

Polished/tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely brown jasper/chert

Limestone (Elephant Skin or Karst-weathered) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Elephant Skin or Karst-weathered)

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Limestone (CaCO3 - Calcium Carbonate)) — sedimentary

Fossiliferous Limestone

Limestone (CaCO3 - Calcium Carbonate)

Fossiliferous Chert (Gryphaea Fossil) (Silicon Dioxide (SiO2) with Calcitic Mollusk Remnants) — sedimentary

Fossiliferous Chert (Gryphaea Fossil)

Silicon Dioxide (SiO2) with Calcitic Mollusk Remnants

Fossil Coral (Coral Limestone (a type of biogenic sedimentary rock)) — Sedimentary

Fossil Coral

Coral Limestone (a type of biogenic sedimentary rock)

Fossiliferous Limestone with Brachiopod (Phylum Brachiopoda in calcitic matrix) — sedimentary

Fossiliferous Limestone with Brachiopod

Phylum Brachiopoda in calcitic matrix

Hag Stone (Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)) — sedimentary

Hag Stone

Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)

Dark flint or chert (Microcrystalline quartz (SiO₂), chiefly chalcedony with possible moganite) — sedimentary

Dark flint or chert

Microcrystalline quartz (SiO₂), chiefly chalcedony with possible moganite

Banded chert pebble (Microcrystalline quartz (SiO₂), likely ferruginous or jaspery chert) — sedimentary

Banded chert pebble

Microcrystalline quartz (SiO₂), likely ferruginous or jaspery chert

Coral Fossil / Coral Fragment (Scleractinia / Calcium Carbonate (CaCO3)) — fossil

Coral Fossil / Coral Fragment

Scleractinia / Calcium Carbonate (CaCO3)

Fossiliferous Limestone Pebble (Biogenic Sedimentary Rock (CaCO3)) — fossil

Fossiliferous Limestone Pebble

Biogenic Sedimentary Rock (CaCO3)

Fossiliferous Limestone (Biogenic Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Stromatolite (Biogenic sedimentary structure (Stromatolite)) — fossil

Stromatolite

Biogenic sedimentary structure (Stromatolite)

Fossiliferous Limestone (Gastropod / Crinoid Fossil Rock) (Biogenic Sedimentary Rock (CaCO3)) — fossil

Fossiliferous Limestone (Gastropod / Crinoid Fossil Rock)

Biogenic Sedimentary Rock (CaCO3)

Coal (Biogenic sedimentary rock (Carbon)) — sedimentary

Coal

Biogenic sedimentary rock (Carbon)

Fossiliferous Limestone (Biogenic Calcium Carbonate (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Coralline Algae / Maerl (Lithothamnion (Biogenic Calcium Carbonate)) — sedimentary

Coralline Algae / Maerl

Lithothamnion (Biogenic Calcium Carbonate)

Chert (Arrowhead Point) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead Point)

Microcrystalline Quartz (SiO2)

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

Pearl

Calcium Carbonate (Aragonite) - CaCO3

Bivalve Fossil (Shell-bearing Sedimentary Rock) (Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix) — fossil

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Pearl (Pearl; primarily aragonite (CaCO₃) with conchiolin) — gemstone

Pearl

Pearl; primarily aragonite (CaCO₃) with conchiolin

Pearl-embellished decorative cross (Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones) — gemstone

Pearl-embellished decorative cross

Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones

Chert (or Fossiliferous Limestone) (Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)) — sedimentary

Chert (or Fossiliferous Limestone)

Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)

Chert / Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Jasper Pebble

Microcrystalline Quartz (SiO2)

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

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Pearl (Aragonite (CaCO3 with conchiolin)) — mineral

Pearl

Aragonite (CaCO3 with conchiolin)

Fossiliferous Limestone (Calcium Carbonate (CaCO3) with Biogenic Inclusions) — sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Inclusions

Chert (and Fossiliferous Limestone) (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert (and Fossiliferous Limestone)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Fossiliferous Calcarenite (CaCO3)) — sedimentary

Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Fossiliferous Limestone (Fossiliferous Calcite (CaCO3)) — sedimentary

Fossiliferous Limestone

Fossiliferous Calcite (CaCO3)

Spiny Oyster Shell (Spondylus varians (Biogenic Calcium Carbonate)) — mineral

Spiny Oyster Shell

Spondylus varians (Biogenic Calcium Carbonate)

Pearl (Organic Mineral (CaCO3 with conchiolin)) — mineral

Pearl

Organic Mineral (CaCO3 with conchiolin)

Chert (Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Pebble)

Silicon Dioxide (SiO2)