Rock Identifier

Category

Organic (Non Rock)

Browse organic (non rock) specimens identified by the Rock Identifier community.

Chert (Grey-Green Var.) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Grey-Green Var.)

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)) — metamorphic

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

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

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Anthracite Coal (Anthracite (Carbon-based metamorphic rock, 86-97% C)) — metamorphic

Anthracite Coal

Anthracite (Carbon-based metamorphic rock, 86-97% C)

Slag Glass (Vitreous Silicate Residue) — industrial byproduct (anthropogenic rock)

Slag Glass

Vitreous Silicate Residue

industrial byproduct (anthropogenic rock)

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

Chert Pebble (Jasper variant)

Microcrystalline Quartz (SiO2)

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

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Chert (specifically Tan/Yellow Chert) (Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)) — sedimentary

Chert (specifically Tan/Yellow Chert)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

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

Chert (specifically Yellow/Brown Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Firewood (Wood Log) (Lignum (Plant tissue composed of cellulose and lignin)) — Organic (Non-geological)

Firewood (Wood Log)

Lignum (Plant tissue composed of cellulose and lignin)

Organic (Non-geological)

Baroque Pearl (Calcium Carbonate (Aragonite or Calcite) and Conchiolin) — Organic Gemstone

Baroque Pearl

Calcium Carbonate (Aragonite or Calcite) and Conchiolin

Organic Gemstone

Oak-grain Laminate (Industrial/Decorative Furniture Finish) (Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)) — not a rock (synthetic material)

Oak-grain Laminate (Industrial/Decorative Furniture Finish)

Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)

not a rock (synthetic material)

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

Chert (Yellow Jasper/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moss Agate (Silicon Dioxide with inclusions (SiO2 + impurities)) — mineral

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Red Jasper (beads) (SiO₂ (Silicon Dioxide)) — Mineral, variety of chalcedony (microcrystalline quartz)

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Mineral, variety of chalcedony (microcrystalline quartz)

Red Coral (Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.) — Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)

Red Coral

Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.

Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)

Chert (specifically Iron-stained River Cobble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)

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

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

Shale (possibly) (Shale (fine-grained clastic sedimentary rock)) — sedimentary

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Quartz (likely) or a Quartzite Pebble (Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.) — Mineral, specifically a detrital grain

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Mineral, specifically a detrital grain

Chert (often called Flint or River Rock) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint or River Rock)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Baltic Amber (Butterscotch or Egg Yolk Variety) (Succinite (chemical formula: C10H16O)) — Organic Gemstone (not a rock or mineral)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Organic Gemstone (not a rock or mineral)

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

Petrified Wood

Silicified wood (primarily SiO2)

Banded Gneiss (Gneiss (pronounced "nice")) — metamorphic

Banded Gneiss

Gneiss (pronounced "nice")

Polymer Clay (Mock Mineral) (Polyvinyl chloride (PVC) with plasticizers and pigment) — Synthetic material (Not a natural rock/mineral)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Synthetic material (Not a natural rock/mineral)

Laterite (Laterite (no specific mineral formula as it's a rock type)) — Sedimentary

Laterite

Laterite (no specific mineral formula as it's a rock type)

Slate (Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)) — metamorphic

Slate

Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)

Mother of Pearl (Nacre) (Calcium Carbonate (primarily aragonite, with conchiolin)) — Organic Gemstone/Biomineral

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Organic Gemstone/Biomineral

Unable to identify - Image contains non-geological items — N/A

Unable to identify - Image contains non-geological items

Shale (Shale) — sedimentary

Shale

Shale

Marble (Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.) — Metamorphic Rock

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Metamorphic Rock

Man-made Synthetic Material (Plastic/Composite) (Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)) — Non-geological / Synthetic

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Non-geological / Synthetic

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

Pyrite

Pyrite (Iron sulfide, FeS₂)

Metal Chain (Likely Steel or a Steel Alloy) (Steel (primarily iron and carbon); specific alloy unknown) — Man-made Object (Metal/Alloy)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Man-made Object (Metal/Alloy)

Banded Chert (Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)) — Sedimentary

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

N/A - Image does not contain a rock or mineral (Anthropogenic textile material) — Non-geological

N/A - Image does not contain a rock or mineral

Anthropogenic textile material

Man-made Metal Pin (Non-geological) (Antimony-Lead Alloy or Zinc/Brass Base with Electroplating) — Metal Alloy / Manufactured Artifact

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Metal Alloy / Manufactured Artifact

Chert / Flint (Chert (varieties include Flint)) — Sedimentary

Chert / Flint

Chert (varieties include Flint)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz) (Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.) — Organic Gemstone (for pearl), Mineral (for sapphire/topaz)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Organic Gemstone (for pearl), Mineral (for sapphire/topaz)

Pyrite (Pyrite (FeS2)) — Mineral

Pyrite

Pyrite (FeS2)

Quartzite (Quartzite (primarily composed of SiO

O₂)) — Sedimentary Rock

Quartzite

Quartzite (primarily composed of SiO O₂)

Sedimentary Rock

Goethite (Goethite (α-FeO(OH))) — Mineral

Goethite

Goethite (α-FeO(OH))