Rock Identifier

Category

Organic (Sedimentary Context)

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

Chert (Jasper variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

sedimentary
Chert (Nodule) (Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (Nodule)

Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)

sedimentary
Mica Schist (Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)) — metamorphic

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

metamorphic
Biotite Mica (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)) — mineral

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

mineral
Quartzite (Quartzite) — Metamorphic

Quartzite

Quartzite

Metamorphic
Quartzite (Quartzite (primarily composed of SiO O₂)) — Sedimentary Rock

Quartzite

Quartzite (primarily composed of SiO O₂)

Sedimentary Rock
Mookaite Jasper (Silicified Radiolarite (SiO2)) — sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

sedimentary
Gneiss (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade regional metamorphic rock)

metamorphic
Chert (Nodule) (Silicon dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Chert (Nodule)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

sedimentary
Chert / Flint Nodule (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Flint Nodule

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Lapis Lazuli (Lapis Lazuli (a rock composed primarily of Lazurite)) — Metamorphic rock

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Metamorphic rock
Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic
Yellow Jasper (Chalcedony (SiO2) with goethite or limonite inclusions) — sedimentary

Yellow Jasper

Chalcedony (SiO2) with goethite or limonite inclusions

sedimentary
Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Mineral
Chert (Nodule) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline Silica (SiO2)

sedimentary
Hematite (beads) (Hematite (Fe₂O₃)) — Mineral

Hematite (beads)

Hematite (Fe₂O₃)

Mineral
Muscovite Mica (Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2) — Mineral

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Mineral
Epidote in Quartz (Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)) — Mineral

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

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

Chert (Nodule)

Microcrystalline Quartz (SiO2)

sedimentary
Marble (Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.) — Metamorphic Rock

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Metamorphic Rock
Chert (Limestone-based) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Limestone-based)

Silicon Dioxide (SiO2)

sedimentary
Chalcopyrite (Chalcopyrite (CuFeS2)) — Mineral

Chalcopyrite

Chalcopyrite (CuFeS2)

Mineral
Chert (Chert (microcrystalline quartz, SiO2)) — Sedimentary

Chert

Chert (microcrystalline quartz, SiO2)

Sedimentary
Quartzite (Quartzite (primarily SiO₂)) — metamorphic

Quartzite

Quartzite (primarily SiO₂)

metamorphic
Marble (Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).) — Metamorphic Rock

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Metamorphic Rock
Marble (Metamorphosed Limestone/Dolomite) — metamorphic

Marble

Metamorphosed Limestone/Dolomite

metamorphic
Chert (variant of Flint) (Chert (SiO2)) — Sedimentary

Chert (variant of Flint)

Chert (SiO2)

Sedimentary
Garnet (likely Almandine or a blend) (Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.) — Mineral

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Mineral
Calcite (Calcite (CaCO3)) — mineral

Calcite

Calcite (CaCO3)

mineral
Chert Pebble/Nodule (Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)) — Sedimentary

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Sedimentary
Quartz (Quartz (SiO2, Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO2, Silicon Dioxide)

Mineral
Chert / Flint (a variety of Chert) (Chert (SiO2)) — Sedimentary Rock (technically a microcrystalline quartz mineral aggregate)

Chert / Flint (a variety of Chert)

Chert (SiO2)

Sedimentary Rock (technically a microcrystalline quartz mineral aggregate)
Calcite (Calcite (Mineral; CaCO₃)) — Mineral

Calcite

Calcite (Mineral; CaCO₃)

Mineral
Chert (varieties include Flint or Jasper) (Chert (cryptocrystalline quartz; SiO₂)) — Sedimentary

Chert (varieties include Flint or Jasper)

Chert (cryptocrystalline quartz; SiO₂)

Sedimentary
Quartz (Quartz (Silicon Dioxide, SiO2)) — Mineral

Quartz

Quartz (Silicon Dioxide, SiO2)

Mineral
Chert (Flint) (Chert (microcrystalline quartz)) — sedimentary

Chert (Flint)

Chert (microcrystalline quartz)

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

Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral
Chert (or Flint) (SiO2 (predominantly microcrystalline quartz)) — Sedimentary

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Sedimentary
Biotite Schist (Biotite Schist) — Metamorphic

Biotite Schist

Biotite Schist

Metamorphic
Calcite (Calcite (CaCO₃)) — Mineral

Calcite

Calcite (CaCO₃)

Mineral
Calcite (Calcite (CaCO 3)) — Mineral

Calcite

Calcite (CaCO 3)

Mineral
Banded Gneiss (Gneiss (typically quartz, feldspar, mica, amphibole composition)) — metamorphic

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

metamorphic