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

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Pyrite in Quartz (Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)) — mineral

Pyrite in Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

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

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium impurities) — mineral

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium impurities

Turquoise (Dyed Howlite/Magnesite) (CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)) — mineral

Turquoise (Dyed Howlite/Magnesite)

CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)

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

Rhodonite

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

Amber (Succinite (Fossilized Tree Resin)) — gemstone

Amber

Succinite (Fossilized Tree Resin)

Chert / Flint (Chert (SiO2)) — sedimentary

Chert / Flint

Chert (SiO2)

Jasper (Chert / Chalcedony) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Jasper (Chert / Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

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

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

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

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Red Jasper (SiO2 (Silicon Dioxide with Iron inclusions)) — sedimentary

Red Jasper

SiO2 (Silicon Dioxide with Iron inclusions)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — fossil

Petrified Wood

Silicified Wood (SiO2 permineralization)

Serpentine (Serpentinite) (Mg3Si2O5(OH)4) — metamorphic

Serpentine (Serpentinite)

Mg3Si2O5(OH)4

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Gneiss

Gneiss (High-grade regional metamorphic rock)

Blue calcite (probable) (Calcite, CaCO₃) — mineral

Blue calcite (probable)

Calcite, CaCO₃

Amber (Succinates (Fossilized Tree Resin)) — mineral

Amber

Succinates (Fossilized Tree Resin)

Emerald (Beryl (Be3Al2(SiO3)6)) — gemstone

Emerald

Beryl (Be3Al2(SiO3)6)

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

Rhodonite

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

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

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Pink Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Pink Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Red Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Red Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (and Jasper/Chalcedony variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (and Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Chert (Iron-stained) (Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)) — sedimentary

Chert (Iron-stained)

Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)

Petrified Wood with Lichen (Silicified Wood (SiO2) colonized by crustose lichens) — fossil

Petrified Wood with Lichen

Silicified Wood (SiO2) colonized by crustose lichens

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

Chert (often called Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Tumbled amber-colored chalcedony (likely carnelian) (Chalcedony, microcrystalline quartz (SiO₂); orange-red variety called carnelian) — mineral

Tumbled amber-colored chalcedony (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety called carnelian

Chrysocolla (Chrysocolla (Cu2–xAlx(H2–xSi2O5)(OH)4·nH2O)) — mineral

Chrysocolla

Chrysocolla (Cu2–xAlx(H2–xSi2O5)(OH)4·nH2O)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Galena with Pyrite (Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)) — mineral

Galena with Pyrite

Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)

Menilite Opal (Goddess Stone) (Menilite Opalescent Silex (Amorphous Hydrated Silica)) — sedimentary

Menilite Opal (Goddess Stone)

Menilite Opalescent Silex (Amorphous Hydrated Silica)

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

Chert (varieties include Flint or Jasper)

Chert (cryptocrystalline quartz; SiO₂)

Carnelian (Carnelian (Silicon Dioxide: SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide: SiO2)