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

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Metallic sulfide-bearing ore, likely pyrite-rich rock (Pyrite (FeS₂), possibly mixed with quartz or other sulfides) — mineral

Metallic sulfide-bearing ore, likely pyrite-rich rock

Pyrite (FeS₂), possibly mixed with quartz or other sulfides

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

Jasper

Jasper (Silicon Dioxide, SiO2)

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

Jasper

Silicon Dioxide (SiO2) with impurities

Lepidolite in Mica Schist (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) — metamorphic

Lepidolite in Mica Schist

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Serpentine (likely serpentinite) (Serpentine-group minerals, chiefly antigorite/lizardite; commonly with magnetite and carbonate) — metamorphic

Serpentine (likely serpentinite)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly with magnetite and carbonate

Black tourmaline (polished schorl) (Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) — mineral

Black tourmaline (polished schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Fine-grained gray stone, likely slate or weathered basalt (Indeterminate; possible slate (foliated phyllite-grade shale)) — metamorphic

Fine-grained gray stone, likely slate or weathered basalt

Indeterminate; possible slate (foliated phyllite-grade shale)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Siltstone with Quartz Vein (Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)) — sedimentary

Siltstone with Quartz Vein

Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)

Amygdaloidal Basalt with Epidote (Amygdaloidal Basalt (Ca2(Al,Fe)3(SiO4)3(OH))) — igneous

Amygdaloidal Basalt with Epidote

Amygdaloidal Basalt (Ca2(Al,Fe)3(SiO4)3(OH))

Eudialyte (Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2) — mineral

Eudialyte

Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2

Amber (Succinite (Fossilized Resin)) — gemstone

Amber

Succinite (Fossilized Resin)

Small pale mineral fragment (Indeterminate; possibly quartz or calcite) — mineral

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

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

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ironstone Concretion (Moqui Marble type) (Iron oxide concretion (Goethite/Hematite and Sandstone)) — sedimentary

Ironstone Concretion (Moqui Marble type)

Iron oxide concretion (Goethite/Hematite and Sandstone)

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

Chert (Jasper/Flint)

Microcrystalline Quartz (SiO2)

Nutting Stone / Cupstone (Sandstone or Quartzite) (Sedimentary rock with anthropogenic modification (cupule)) — sedimentary

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Banded Chert (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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

Chrysocolla

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

Labradorite (Labradorite ((Ca, Na)(Al, Si)4O8)) — igneous

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Pyrite (Pyrite (Iron sulfide, FeS₂)) — Mineral

Pyrite

Pyrite (Iron sulfide, FeS₂)

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

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Pyrite with Galena and Sphalerite on Matrix (Iron Sulfide (FeS2), Lead Sulfide (PbS), Zinc Sulfide (ZnS)) — mineral

Pyrite with Galena and Sphalerite on Matrix

Iron Sulfide (FeS2), Lead Sulfide (PbS), Zinc Sulfide (ZnS)

Red Jasper (Microcrystalline Quartz (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Jasper (Green/Dragon Blood variety) (Silicon Dioxide (SiO2) with iron/clay inclusions) — sedimentary

Jasper (Green/Dragon Blood variety)

Silicon Dioxide (SiO2) with iron/clay inclusions

Galena (Lead(II) Sulfide (PbS)) — mineral

Galena

Lead(II) Sulfide (PbS)

Taaffeite (BeMgAl4O8 (Beryllium Magnesium Aluminum Oxide)) — mineral

Taaffeite

BeMgAl4O8 (Beryllium Magnesium Aluminum Oxide)

Rhodonite (Manganese silicate (MnSiO3)) — mineral

Rhodonite

Manganese silicate (MnSiO3)

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

Chert (Flint Nodules)

Chert (Microcrystalline Quartz, SiO2)

Raw Amber / Resin Mineral (Succinite (Fossilized Tree Resin)) — gemstone

Raw Amber / Resin Mineral

Succinite (Fossilized Tree Resin)

Fossiliferous Limestone (Fossiliferous Limestone) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone

Fossil Crab (Decapoda (likely Avitelmessus or Raninidae family)) — sedimentary

Fossil Crab

Decapoda (likely Avitelmessus or Raninidae family)

Polished amber (likely copal or amber) (Fossilized tree resin; amber is predominantly polymerized diterpenoid resin, while copal is younger, incompletely polymerized resin) — gemstone

Polished amber (likely copal or amber)

Fossilized tree resin; amber is predominantly polymerized diterpenoid resin, while copal is younger, incompletely polymerized resin

Chert (Pink variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Pink variety)

Microcrystalline Quartz (SiO2)