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

Chert (Green Fossilized Algae or Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Green Fossilized Algae or Jasper)

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (primarily Quartz/Chalcedony, SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Chert (Nodular or Massive Variety) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Chert (specifically Jasper or Flint variety) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Jasper or Flint variety)

Cryptocrystalline Quartz (SiO2)

Polished brecciated jasper or agate (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and possibly carbonate inclusions) — mineral

Polished brecciated jasper or agate

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and possibly carbonate inclusions

Ironstone concretion / Limonitic Sandstone (Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)) — sedimentary

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)

Green Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

Emerald (Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)) — gemstone

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Chert (Yellow Jasper/Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Yellow Sapphire (Raw) (Corundum (Al2O3)) — mineral

Yellow Sapphire (Raw)

Corundum (Al2O3)

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30) — mineral

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Fuchsite (Chrome Mica) (K(Al,Cr)2(AlSi3O10)(OH)2) — mineral

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Malachite in Host Rock (Cu2CO3(OH)2) — mineral

Malachite in Host Rock

Cu2CO3(OH)2

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

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Serpentinite (Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)

Fossiliferous Sandstone (Sedimentary rock containing invertebrate fossils) — fossil

Fossiliferous Sandstone

Sedimentary rock containing invertebrate fossils

Dark cabochon gemstone, likely labradorite (Labradorite, plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)) — gemstone

Dark cabochon gemstone, likely labradorite

Labradorite, plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Epidote (Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))) — metamorphic

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Unakite Mushroom Carving (Altered Granite (composed of orthoclase feldspar, green epidote, and quartz)) — metamorphic

Unakite Mushroom Carving

Altered Granite (composed of orthoclase feldspar, green epidote, and quartz)

Chert (Jasper/Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

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

Chert / Flint

Silicon Dioxide (SiO₂)

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

Chert (Flint)

Silicon Dioxide (SiO2)

Amber (Succinite (C10H16O)) — mineral

Amber

Succinite (C10H16O)

Carnelian / Chalcedony (Silicon Dioxide (SiO2)) — mineral

Carnelian / Chalcedony

Silicon Dioxide (SiO2)

Amber with dark mineral/organic inclusions (Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)) — gemstone

Amber with dark mineral/organic inclusions

Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)

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

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Dalmatian jasper (Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions) — igneous

Dalmatian jasper

Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions

Rhodonite (Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)) — mineral

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Lapis Lazuli (in jewelry setting) (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)) — metamorphic

Lapis Lazuli (in jewelry setting)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Moss Agate (Silicon Dioxide (SiO2) with inclusions) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions

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

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Jasper or Flint type) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Jasper or Flint type)

Microcrystalline Quartz (SiO2)

Turquoise (Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)) — mineral

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Chrysoprase (Chalcedony (Silicon Dioxide, SiO2)) — gemstone

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2)

Blue Lace Agate (Silicon Dioxide (SiO2), variety of Chalcedony) — gemstone

Blue Lace Agate

Silicon Dioxide (SiO2), variety of Chalcedony

Epidote with Quartz Vein (Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))) — metamorphic

Epidote with Quartz Vein

Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))