Rock Identifier

Category

Organic Gemstone (Fossilized Resin)

Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Fossilized Resin) in the encyclopedia

Amber

Petrified Wood

Sapropel

Jet

Bituminous Shale

Bituminous Shale

Red Garnet

Black Shale

Opalized Wood

Peat

Oil Shale

Kambaba Jasper

Diatomaceous Earth

Bivalve Fossil (Clam Shell) (Class Bivalvia) — fossil

Bivalve Fossil (Clam Shell)

Class Bivalvia

Petoskey Stone / Rugose Coral Fossil (Hexagonaria percarinata) — fossil

Petoskey Stone / Rugose Coral Fossil

Hexagonaria percarinata

Red Chert (Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Red Chert (Jasper)

Silicon Dioxide (SiO2)

Yellow Jasper / Chert (Jasper (Silica/Quartz) - SiO2) — sedimentary

Yellow Jasper / Chert

Jasper (Silica/Quartz) - SiO2

Chert (Jasper/Jasperoid) (Chert (chemically precipitated microcrystalline Quartz, SiO2)) — sedimentary

Chert (Jasper/Jasperoid)

Chert (chemically precipitated microcrystalline Quartz, SiO2)

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Tan Chert or Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Tan Chert or Flint)

Silicon Dioxide (SiO2)

Petoskey Stone (Hexagonaria percarinata) — fossil

Petoskey Stone

Hexagonaria percarinata

Petoskey Stone (Fossilized Rugose Coral) (Hexagonaria percarinata (Calcium Carbonate, CaCO3)) — sedimentary

Petoskey Stone (Fossilized Rugose Coral)

Hexagonaria percarinata (Calcium Carbonate, CaCO3)

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)

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

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Ironstone Concretion (Coprolite-like) (Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))) — sedimentary

Ironstone Concretion (Coprolite-like)

Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))

Crinoid Stem Fossil (Crinoid columnal (Class Crinoidea)) — sedimentary

Crinoid Stem Fossil

Crinoid columnal (Class Crinoidea)

Tufa (Vesicular Limestone) (Tufa (form of Calcium Carbonate, CaCO3)) — sedimentary

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Sandstone (Banded) (Clastic Sedimentary Rock (primarily Quartz, SiO2)) — sedimentary

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Crinoid Stem Fossil (in Chert or Limestone Matrix) (Crinoidea (Class) - Calcium Carbonate (CaCO3)) — sedimentary

Crinoid Stem Fossil (in Chert or Limestone Matrix)

Crinoidea (Class) - Calcium Carbonate (CaCO3)

Septarian Nodule (Dragon Stone) (Septarian concretion (composition: Calcium Carbonate / Calcite, Aragonite, and Limestone/Clay)) — sedimentary

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: Calcium Carbonate / Calcite, Aragonite, and Limestone/Clay)

Red Jasper (Jasper (Silicon Dioxide with Iron inclusions - SiO2)) — Sedimentary/Metamorphic

Red Jasper

Jasper (Silicon Dioxide with Iron inclusions - SiO2)

Sedimentary/Metamorphic

Trilobite Pygidium (Tail Segment) (Phylum Arthropoda, Class Trilobita (likely order Phacopida)) — sedimentary (fossil)

Trilobite Pygidium (Tail Segment)

Phylum Arthropoda, Class Trilobita (likely order Phacopida)

sedimentary (fossil)

Fossilized Syringopora Coral (Organ Pipe Coral Fossil) (Syringopora sp. (Class Anthozoa, Order Tabulata)) — fossil

Fossilized Syringopora Coral (Organ Pipe Coral Fossil)

Syringopora sp. (Class Anthozoa, Order Tabulata)

Chert (or Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (or Chalcedony)

Microcrystalline Quartz (SiO2)

Petoskey Stone (Fossilized Rugose Coral) (Hexagonaria percarinata) — sedimentary

Petoskey Stone (Fossilized Rugose Coral)

Hexagonaria percarinata

Petrified Wood (Silicified wood (principally SiO2)) — sedimentary

Petrified Wood

Silicified wood (principally SiO2)

Fossilized Horn Coral (Order Rugosa (Calcium Carbonate - CaCO3)) — sedimentary

Fossilized Horn Coral

Order Rugosa (Calcium Carbonate - CaCO3)

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

Jasper

Silicon Dioxide (SiO2) with impurities

Chert (Yellow/Tan) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (often called Flint or Jasper) (Cryptocrystalline quartz (SiO2)) — sedimentary

Chert (often called Flint or Jasper)

Cryptocrystalline quartz (SiO2)

Chert (White Chert or Flint) (Microcrystalline or cryptocrystalline quartz (SiO2)) — sedimentary

Chert (White Chert or Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

Mookaite Jasper (Silicon Dioxide with Iron Oxide impurities (SiO2)) — mineral

Mookaite Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2)

Honey-colored chalcedony (rough agate/chert) (Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining) — mineral

Honey-colored chalcedony (rough agate/chert)

Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining

Blue-green fluorite (likely tumbled/polished) (Fluorite, calcium fluoride (CaF₂)) — mineral

Blue-green fluorite (likely tumbled/polished)

Fluorite, calcium fluoride (CaF₂)

Quartz and Limestone Grouping (Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)) — mineral

Quartz and Limestone Grouping

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Sandstone (likely Fossiliferous) (Arenite / Sedimentum arenaceum) — sedimentary

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Chert (specifically Red Chert / Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Red Chert / Jasper)

Silicon Dioxide (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (specifically Flint or Common Chert) (Silicon dioxide (SiO2) - Microcrystalline quartz) — sedimentary

Chert (specifically Flint or Common Chert)

Silicon dioxide (SiO2) - Microcrystalline quartz

Sandstone (Arenite (Siliclastic sedimentary rock)) — sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Fossilized Coral (Favosites) (Favosites (Extinct Tabulate Coral)) — sedimentary

Fossilized Coral (Favosites)

Favosites (Extinct Tabulate Coral)

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

Chert (specifically Flint)

Microcrystalline Quartz (SiO2)