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 (often called Flint in dark varieties) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint in dark varieties)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Malachite (Copper carbonate hydroxide Cu2CO3(OH)2) — mineral

Malachite

Copper carbonate hydroxide Cu2CO3(OH)2

Banded Chert (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert

Silicon Dioxide (SiO2)

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

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chrysocolla (Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O) — mineral

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Prehnite (Prehnite (Ca2Al2Si3O10(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4

Carnelian (Silicon Dioxide (Chalcedony variety), SiO2) — gemstone

Carnelian

Silicon Dioxide (Chalcedony variety), SiO2

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

Rhodonite

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

Jade Dice (Nephrite / Jadeite (Ca2(Mg,Fe)5Si8O22(OH)2 or NaAlSi2O6)) — gemstone

Jade Dice

Nephrite / Jadeite (Ca2(Mg,Fe)5Si8O22(OH)2 or NaAlSi2O6)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

Yellow Jasper (Silicon Dioxide (SiO2) with iron hydroxides (goethite)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (goethite)

Moonstone (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Pyrite-bearing sulfide ore (likely pyrite with iron oxides) (Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides) — mineral

Pyrite-bearing sulfide ore (likely pyrite with iron oxides)

Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides

Red Jasper (Silicon dioxide with iron oxide impurities (SiO2)) — sedimentary

Red Jasper

Silicon dioxide with iron oxide impurities (SiO2)

Chert (Iron-stained) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Bloodstone (Heliotrope) (Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite) — mineral

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite

Amazonite (Microcline (KAlSi3O8) with lead impurities) — mineral

Amazonite

Microcline (KAlSi3O8) with lead impurities

Chert (often called Flint or Jasper based on color) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz with Mica inclusions (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Mica inclusions

Quartz (Silicon Dioxide, SiO2)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Jasper (Silicon dioxide (Microcrystalline quartz, SiO2)) — mineral

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

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

Chert (Chalcedony)

Silicon Dioxide (SiO2)

Peach Moonstone (Orange/Peach Feldspar) (Potassium aluminum silicate (KAlSi3O8)) — mineral

Peach Moonstone (Orange/Peach Feldspar)

Potassium aluminum silicate (KAlSi3O8)

Beryl (likely Aquamarine or Green Beryl) (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Beryl (likely Aquamarine or Green Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Pyrite-bearing sulfide specimen (Pyrite (FeS₂), possibly with chalcopyrite and weathered sulfides) — mineral

Pyrite-bearing sulfide specimen

Pyrite (FeS₂), possibly with chalcopyrite and weathered sulfides

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Leopard Skin Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

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

Botryoidal pyrite (likely with quartz or chlorite matrix) (Pyrite, FeS₂; botryoidal aggregate) — mineral

Botryoidal pyrite (likely with quartz or chlorite matrix)

Pyrite, FeS₂; botryoidal aggregate

Quartz with Mica/Host Rock (Silicon Dioxide (SiO2) with Phyllosilicates) — mineral

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Red Jasper (Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)