Rock Identifier

Category

Sedimentary (Biogenic)

Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.

Learn about Sedimentary (Biogenic) in the encyclopedia

Conglomerate

Quartzite Sandstone

Quartzite Sandstone

Breccia

Ironstone

Diatomite

Coal

Kambaba Jasper

Limestone

Asphalt Rock

Claystone

Mudstone

Sapropel

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

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

Tumbled brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Fossiliferous limestone, likely coral or shell-rich limestone (Biogenic calcite (CaCO₃), commonly limestone containing fossil coral or mollusks) — fossil

Fossiliferous limestone, likely coral or shell-rich limestone

Biogenic calcite (CaCO₃), commonly limestone containing fossil coral or mollusks

Pearl (Calcium carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Pearl

Calcium carbonate (CaCO3) in the form of Aragonite or Calcite

Pearl (Biogenic CaCO3 (Aragonite and Calcite)) — mineral

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Banded chert or siliceous sedimentary rock (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide staining and possible carbonate/clay layers) — sedimentary

Banded chert or siliceous sedimentary rock

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide staining and possible carbonate/clay layers

Black flint (chert) (Microcrystalline quartz/chalcedony (SiO₂)) — sedimentary

Black flint (chert)

Microcrystalline quartz/chalcedony (SiO₂)

Rounded flint or chert pebble (Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities) — sedimentary

Rounded flint or chert pebble

Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities

Chert (likely flint-bearing chert) (Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)) — sedimentary

Chert (likely flint-bearing chert)

Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)

Weathered iron-rich chert or jasper (Microcrystalline quartz (SiO₂), commonly colored by iron oxides/hydroxides) — sedimentary

Weathered iron-rich chert or jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides/hydroxides

$Flint (chert), likely a worked or fractured nodule (Microcrystalline quartz/chalcedony (SiO₂)) — sedimentary$

Flint (chert), likely a worked or fractured nodule

Microcrystalline quartz/chalcedony (SiO₂)

Brown chert or flint pebble (Microcrystalline quartz (SiO₂), commonly with chalcedony and iron-oxide staining) — sedimentary

Brown chert or flint pebble

Microcrystalline quartz (SiO₂), commonly with chalcedony and iron-oxide staining

Chalky limestone (Micritic calcite (CaCO₃), likely biogenic limestone/chalk) — sedimentary

Chalky limestone

Micritic calcite (CaCO₃), likely biogenic limestone/chalk

Layered limestone, likely stromatolitic or microbial limestone (Limestone; predominantly calcite (CaCO₃), possibly biogenic micrite) — sedimentary

Layered limestone, likely stromatolitic or microbial limestone

Limestone; predominantly calcite (CaCO₃), possibly biogenic micrite

Jasper containing fossilized inclusions (Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions) — sedimentary

Jasper containing fossilized inclusions

Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions

Fossilized shell or coral fragment (Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)) — fossil

Fossilized shell or coral fragment

Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)

Limestone (Chalk / Calcite Rock) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Chalk / Calcite Rock)

Calcium Carbonate (CaCO3)

Worn quartz-rich pebble (Likely microcrystalline quartz (SiO₂), possibly a weathered chert or milky quartz fragment) — mineral

Worn quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly a weathered chert or milky quartz fragment

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

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

Pearl (Calcium carbonate (principally Aragonite, CaCO3) with Conchiolin) — gemstone

Pearl

Calcium carbonate (principally Aragonite, CaCO3) with Conchiolin

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

Pearl

Calcium Carbonate (Aragonite and Calcite), CaCO3

Precious Red Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

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

Turquoise-and-coral silver jewelry brooch (Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; red cabochons appear to be coral, likely set in silver) — gemstone

Turquoise-and-coral silver jewelry brooch

Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; red cabochons appear to be coral, likely set in silver

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

Polished brown flint/chert (likely) (Microcrystalline quartz, SiO₂ (chalcedonic flint/chert)) — sedimentary

Polished brown flint/chert (likely)

Microcrystalline quartz, SiO₂ (chalcedonic flint/chert)

Tumbled dark stone, possibly chert or basalt (Indeterminate; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline chert (quartz, SiO₂)) — igneous

Tumbled dark stone, possibly chert or basalt

Indeterminate; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline chert (quartz, SiO₂)

Chert nodule in sandstone or iron-stained host rock (Microcrystalline quartz (SiO₂), likely chert/flint) — sedimentary

Chert nodule in sandstone or iron-stained host rock

Microcrystalline quartz (SiO₂), likely chert/flint

Chert (likely jasper-bearing chert) (Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony) — sedimentary

Chert (likely jasper-bearing chert)

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony

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

Pearl

Calcium Carbonate (Aragonite) - CaCO3

Tumbled chert or chalcedony pebble (Microcrystalline quartz (SiO₂), likely chert/chalcedony) — sedimentary

Tumbled chert or chalcedony pebble

Microcrystalline quartz (SiO₂), likely chert/chalcedony

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

Coral Fossil / Coral Fragment

Scleractinia / Calcium Carbonate (CaCO3)

Banded chert or jasper pebble (Microcrystalline quartz (SiO₂), likely chert/jasper with iron-oxide staining) — sedimentary

Banded chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper with iron-oxide staining

Chert or silicified rock fragment (Microcrystalline quartz (SiO₂), likely chert with iron-oxide staining) — sedimentary

Chert or silicified rock fragment

Microcrystalline quartz (SiO₂), likely chert with iron-oxide staining

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

White coral limestone (probable fossiliferous limestone) (Calcite (CaCO₃), commonly derived from aragonitic coral skeletons recrystallized to calcite) — sedimentary

White coral limestone (probable fossiliferous limestone)

Calcite (CaCO₃), commonly derived from aragonitic coral skeletons recrystallized to calcite