Rock Identifier

Category

Organic Gemstone (Not A Rock)

Browse organic gemstone (not a rock) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Not A Rock) in the encyclopedia

Bituminous Shale

Bituminous Shale

Black Shale

Oil Shale

Lapis Lazuli

Jet

Pegmatite

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Siltstone with Fossil Cast (Sedimentary Rock (Siltstone / Fine-grained Sandstone)) — sedimentary

Siltstone with Fossil Cast

Sedimentary Rock (Siltstone / Fine-grained Sandstone)

Pyrite in Shale (Iron Sulfide (FeS2) in Sedimentary Matrix) — mineral

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Sandstone (with carbonaceous plant fragments) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Shale fragment (Shale (Laminated Mudstone)) — sedimentary

Shale fragment

Shale (Laminated Mudstone)

Likely chert or flint (Microcrystalline quartz (SiO₂), commonly called chert; exact identification requires testing) — sedimentary

Likely chert or flint

Microcrystalline quartz (SiO₂), commonly called chert; exact identification requires testing

White limestone or chalky carbonate rock (Calcite-rich limestone; possibly chalk (CaCO₃)) — sedimentary

White limestone or chalky carbonate rock

Calcite-rich limestone; possibly chalk (CaCO₃)

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

Chert / Chalcedony Nodules

Microcrystalline Quartz (SiO2)

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

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Pyrite in Slate or Shale (Iron Sulfide (FeS2) in Argillaceous Matrix) — mineral

Pyrite in Slate or Shale

Iron Sulfide (FeS2) in Argillaceous Matrix

Chert Nodule (Chert (Cryptocrystalline variety of Quartz, SiO2)) — sedimentary

Chert Nodule

Chert (Cryptocrystalline variety of Quartz, SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Banded Chert (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert

Silicon Dioxide (SiO2)

Limestone (Calcium carbonate (CaCO3)) — sedimentary

Limestone

Calcium carbonate (CaCO3)

Fossil Shell (Brachiopod or Mollusk) (Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)) — fossil

Fossil Shell (Brachiopod or Mollusk)

Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)

Graphite-rich schist (likely graphite ore) (Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar) — metamorphic

Graphite-rich schist (likely graphite ore)

Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar

Chert with Quartz Veins (Microcrystalline Quartz (SiO2)) — sedimentary

Chert with Quartz Veins

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Petrified Wood (Silicified Wood (Silicon Dioxide - SiO2)) — fossil

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Moss Agate (Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2) — gemstone

Moss Agate

Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2

Chert (Jasper) (Microcrystalline Quartz (SiO2) with hematite impurities) — sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2) with hematite impurities

Clear Quartz (Faceted) / White Sapphire / Goshenite (Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)) — gemstone

Clear Quartz (Faceted) / White Sapphire / Goshenite

Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)

Fossiliferous Limestone (Biogenic Sedimentary Rock / CaCO3 with fossil fragments) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock / CaCO3 with fossil fragments

Limestone pebble (Sedimentary rock, primarily calcium carbonate (CaCO3)) — sedimentary

Limestone pebble

Sedimentary rock, primarily calcium carbonate (CaCO3)

Glauconite (Greensand) ((K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂) — sedimentary

Glauconite (Greensand)

(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂

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

Chert (Jasper variety)

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)

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

Moss Agate Sphere

Silicon Dioxide (SiO2) with inclusions

Brachiopod Fossil in Limestone (Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)) — sedimentary

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Chert (and Jasper blend) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (and Jasper blend)

Chert (Microcrystalline Quartz, SiO2)

Chert (with Quartz Vein) (Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)) — sedimentary

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

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

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Flint) (Microcrystalline Opaline Silica (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Opaline Silica (SiO2)

Amber (Succinite (C10H16O)) — mineraloid

Amber

Succinite (C10H16O)

Chert Concretion (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Concretion

Microcrystalline Quartz (SiO2)

Fossilized Bone (Petrified Bone (Fluorapatite / Calcium Phosphate replacement)) — fossil

Fossilized Bone

Petrified Bone (Fluorapatite / Calcium Phosphate replacement)

Agatized Petrified Wood (Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood) — metamorphic

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Moss Agate (Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Amber (Fossilized Tree Resin (Succinate)) — mineral

Amber

Fossilized Tree Resin (Succinate)