Rock Identifier

Category

Organic Gemstone (Often Associated With Sedimentary Sequences)

Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Often Associated With Sedimentary Sequences) in the encyclopedia

Sapropel

Bituminous Shale

Bituminous Shale

Turbidite

Black Shale

Ironstone

Oil Shale

Jet

Limestone

Sandstone

Pegmatite

Euxenite

Pyroxenite

Banded Chert (Microcrystalline silicon dioxide (SiO2)) — sedimentary

Banded Chert

Microcrystalline silicon dioxide (SiO2)

Arid Sandy Loam (Arenosols / Regosols) — sedimentary

Arid Sandy Loam

Arenosols / Regosols

Blue Celestine (Celestine (SrSO4)) — mineral

Blue Celestine

Celestine (SrSO4)

Howlite (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

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

Flint (Chert)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variant) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Pink Chert (Brecciated Jasmine/Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Pink Chert (Brecciated Jasmine/Jasper)

Silicon Dioxide (SiO2)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Mosasaur Jaw Fossil in Matrix (Mosasaurus (family Mosasauridae) in Phosphate Sandstone) — sedimentary

Mosasaur Jaw Fossil in Matrix

Mosasaurus (family Mosasauridae) in Phosphate Sandstone

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Jasper and Quartz Pebble (Silicon dioxide (SiO2) microcrystalline quartz variety) — sedimentary

Jasper and Quartz Pebble

Silicon dioxide (SiO2) microcrystalline quartz variety

Coal (Bituminous Coal) (Caustobiolith / Sedimentary Rock) — sedimentary

Coal (Bituminous Coal)

Caustobiolith / Sedimentary Rock

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

Chert Pebble (Jasper variant)

Microcrystalline Quartz (SiO2)

Aquamarine and clear quartz (Aquamarine (Be3Al2Si6O18), Quartz (SiO2)) — Mineral

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Yellow Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Weathered dark flint (chert) pebble (Microcrystalline quartz (SiO₂), commonly called flint or chert) — sedimentary

Weathered dark flint (chert) pebble

Microcrystalline quartz (SiO₂), commonly called flint or chert

Unakite (Unakite (an altered granite composed of Epidote, Orthoclase, and Quartz)) — metamorphic

Unakite

Unakite (an altered granite composed of Epidote, Orthoclase, and Quartz)

Anthracite Coal (Anthracite) — sedimentary

Anthracite Coal

Anthracite

Jasper (Quartz (SiO2)) — sedimentary

Jasper

Quartz (SiO2)

Natural Pearl (Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3) — mineral

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Chert (often called Flint or River Stone) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint or River Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Yellow Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

Quartz (beads) (SiO2 (Silicon Dioxide)) — Mineral

Quartz (beads)

SiO2 (Silicon Dioxide)

Fossilized Bone (Permineralized Vertebrate Bone) — fossil

Fossilized Bone

Permineralized Vertebrate Bone

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Labradorite (Dark or Black variety) (Labradorite (member of Plagioclase Feldspar group), (Na,Ca)(Si,Al)4O8) — mineral

Labradorite (Dark or Black variety)

Labradorite (member of Plagioclase Feldspar group), (Na,Ca)(Si,Al)4O8

Chert (White Chert/Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (White Chert/Flint)

Silicon Dioxide (SiO2)

Chert (often called Flint when dark) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Bioclastic Limestone (composition: CaCO3)) — sedimentary

Fossiliferous Limestone

Bioclastic Limestone (composition: CaCO3)

Chrysocolla in Cuprite / Mixed Copper Ore (Hydrated copper silicate and copper(I) oxide, (Cu,Al)2H2Si2O5(OH)4·nH2O and Cu2O) — mineral

Chrysocolla in Cuprite / Mixed Copper Ore

Hydrated copper silicate and copper(I) oxide, (Cu,Al)2H2Si2O5(OH)4·nH2O and Cu2O

Chromite (Chromite (FeCr2O4)) — mineral

Chromite

Chromite (FeCr2O4)

Greenstone (Epidosite or Altered Basalt) (Epidosite (Ca2(Al, Fe)3(SiO4)3(OH))) — metamorphic

Greenstone (Epidosite or Altered Basalt)

Epidosite (Ca2(Al, Fe)3(SiO4)3(OH))

Sandstone (likely Fossiliferous Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Malachite (Malachite - Cu2CO3(OH)2) — mineral

Malachite

Malachite - Cu2CO3(OH)2

Tumbled carnelian (orange-red chalcedony) (Carnelian, a microcrystalline variety of quartz (SiO₂)) — gemstone

Tumbled carnelian (orange-red chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)