Rock Identifier

Category

Mineral (Biogenic)

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

Learn about Mineral (Biogenic) in the encyclopedia

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Dolomite

Chert (Nodule) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Yellow-brown chert or silicified rock fragment (Microcrystalline quartz (SiO₂), likely chert or chalcedony-rich material) — sedimentary

Yellow-brown chert or silicified rock fragment

Microcrystalline quartz (SiO₂), likely chert or chalcedony-rich material

Polished dark stone, likely basalt or black jasper (Basalt (fine-grained plagioclase–pyroxene rock), possibly iron-rich jasper/chert) — igneous

Polished dark stone, likely basalt or black jasper

Basalt (fine-grained plagioclase–pyroxene rock), possibly iron-rich jasper/chert

Tumbled yellow-brown stone, likely chert or jasper (Microcrystalline quartz (SiO₂), possibly iron-stained chert/jasper) — sedimentary

Tumbled yellow-brown stone, likely chert or jasper

Microcrystalline quartz (SiO₂), possibly iron-stained chert/jasper

Chert (and associated Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and associated Flint)

Silicon Dioxide (SiO2)

Polished fossil shell or bone fragment (tentative) (Indeterminate biogenic carbonate or fossilized bone; possibly a small gastropod/bivalve fragment) — fossil

Polished fossil shell or bone fragment (tentative)

Indeterminate biogenic carbonate or fossilized bone; possibly a small gastropod/bivalve fragment

Polished brown flint/chert nodule (Microcrystalline quartz (SiO₂), commonly called flint or chert) — sedimentary

Polished brown flint/chert nodule

Microcrystalline quartz (SiO₂), commonly called flint or chert

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

Brown flint or chert pebble

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

Pearl oyster shell with natural pearls (Molluscan shell, likely Pinctada spp.; pearls are aragonite (CaCO₃)) — fossil

Pearl oyster shell with natural pearls

Molluscan shell, likely Pinctada spp.; pearls are aragonite (CaCO₃)

Calcite (Calcite (Mineral; CaCO₃)) — Mineral

Calcite

Calcite (Mineral; CaCO₃)

Mookaite Jasper (Silicified Radiolarite (SiO2)) — sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

Weathered chert or flint pebble (Microcrystalline quartz (SiO₂), likely chert/flint with possible carbonate or quartz vein) — sedimentary

Weathered chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert/flint with possible carbonate or quartz vein

Tumbled brown chert (likely flint) (Microcrystalline quartz/chalcedony, SiO₂) — sedimentary

Tumbled brown chert (likely flint)

Microcrystalline quartz/chalcedony, SiO₂

Fossiliferous Limestone (Coquina / Shell Limestone) (Bioclastic Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina / Shell Limestone)

Bioclastic Limestone (CaCO3)

Limestone with Calcite Veining (Calcium Carbonate (CaCO3) - Biogenic/Chemical Sedimentary Rock) — sedimentary

Limestone with Calcite Veining

Calcium Carbonate (CaCO3) - Biogenic/Chemical Sedimentary Rock

Pearl necklace (Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)) — gemstone

Pearl necklace

Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)

Fossiliferous Limestone (Biogenic Sedimentary Rock (primarily CaCO3 with fossil fragments)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (primarily CaCO3 with fossil fragments)

Chert (Pink/Red variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Pink/Red variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Weathered fossil shell fragment (Likely a bivalve or gastropod shell, composed mainly of biogenic calcite/aragonite (CaCO₃)) — fossil

Weathered fossil shell fragment

Likely a bivalve or gastropod shell, composed mainly of biogenic calcite/aragonite (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

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

Chert (likely flint-bearing chert)

Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)

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

Polished brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

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

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

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)

Pearl necklace (Pearl—biogenic calcium carbonate, primarily aragonite (CaCO₃)) — gemstone

Pearl necklace

Pearl—biogenic calcium carbonate, primarily aragonite (CaCO₃)

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

Chalk (CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock) — Sedimentary

Chalk

CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock

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

Limestone (Chalk / Calcite Rock)

Calcium Carbonate (CaCO3)

Weathered quartz-rich rock, likely chert or quartzite (Quartzite/chert; predominantly microcrystalline quartz (SiO₂), with iron-oxide staining and possible minor feldspar or clay minerals) — metamorphic

Weathered quartz-rich rock, likely chert or quartzite

Quartzite/chert; predominantly microcrystalline quartz (SiO₂), with iron-oxide staining and possible minor feldspar or clay minerals

Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Calcite

Calcite (Calcium Carbonate, CaCO3)

Sea Shell (Fighting Conch Fragment) (Calcium Carbonate (CaCO3) - Strombus alatus fragment) — sedimentary (biogenic)

Sea Shell (Fighting Conch Fragment)

Calcium Carbonate (CaCO3) - Strombus alatus fragment

sedimentary (biogenic)

Popcorn (Zea mays everta (P. Wilson) (Botanical name for the corn variety)) — Organic/Biogenic

Popcorn

Zea mays everta (P. Wilson) (Botanical name for the corn variety)

Organic/Biogenic

Calcite (likely a tumbled specimen) (Calcite (CaCO
3
)) — Mineral

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Yellow chert or jasper pebble (Microcrystalline quartz (SiO₂), likely iron-oxide-stained chert/jasper) — sedimentary

Yellow chert or jasper pebble

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

Pearls (likely freshwater cultured pearls) (Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin) — gemstone

Pearls (likely freshwater cultured pearls)

Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin

Coral limestone / fossil coral (Biogenic calcium carbonate, chiefly aragonite or calcite (CaCO₃); likely fossilized colonial coral) — fossil

Coral limestone / fossil coral

Biogenic calcium carbonate, chiefly aragonite or calcite (CaCO₃); likely fossilized colonial coral

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

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

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

Black flint (chert)

Microcrystalline quartz/chalcedony (SiO₂)