Rock Identifier

Category

Organic Crystal (Mineraloid)

Browse organic crystal (mineraloid) specimens identified by the Rock Identifier community.

Petrified Wood (Silicified Wood (SiO2 permineralization)) — fossil

Petrified Wood

Silicified Wood (SiO2 permineralization)

Fossiliferous limestone (Bioclastic carbonate rock; predominantly calcite (CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic carbonate rock; predominantly calcite (CaCO₃)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Jade (likely Jadeite or Nephrite) (Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)) — Mineral/Mineraloid

Jade (likely Jadeite or Nephrite)

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

Mineral/Mineraloid

Chert (Green and Black Jasper variant) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Green and Black Jasper variant)

Cryptocrystalline Quartz (SiO2)

Limestone with Lichen/Moss (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Lichen/Moss

Calcium Carbonate (CaCO3)

Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

Fossilized Plant or Tree Bark (Lepidodendron or Sigillaria (example genera)) — sedimentary

Fossilized Plant or Tree Bark

Lepidodendron or Sigillaria (example genera)

Petrified Wood (Fossilized plant material (Silicon dioxide - SiO2)) — fossil

Petrified Wood

Fossilized plant material (Silicon dioxide - SiO2)

Red Coral (Corallium rubrum) — mineral

Red Coral

Corallium rubrum

Red Coral (with Hematite and Black Pearl accents) (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Red Coral (with Hematite and Black Pearl accents)

Corallium rubrum (Calcium Carbonate, CaCO3)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Amber / Copal (Organic resin, C10H16O) — mineral

Amber / Copal

Organic resin, C10H16O

Tumbled amber (Amber (fossilized plant resin; commonly succinite, C10H16O)) — gemstone

Tumbled amber

Amber (fossilized plant resin; commonly succinite, C10H16O)

Amber (Succinite (Organic Gemstone)) — mineral

Amber

Succinite (Organic Gemstone)

Obsidian (Obsidian (volcanic glass)) — Igneous

Obsidian

Obsidian (volcanic glass)

Amber (Succinite) — mineral

Amber

Succinite

Jasper containing fossilized inclusions (Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions) — sedimentary

Jasper containing fossilized inclusions

Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions

Amber (Succinite (fossilized tree resin)) — fossil

Amber

Succinite (fossilized tree resin)

Pearl (Nacre (aragonite, CaCO₃, with conchiolin)) — gemstone

Pearl

Nacre (aragonite, CaCO₃, with conchiolin)

Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

Pyritized Ammonite (Ammonitida (replaced by Iron Disulfide, FeS2)) — sedimentary

Pyritized Ammonite

Ammonitida (replaced by Iron Disulfide, FeS2)

Pyrite Concretion (Iron Sulfide (FeS2) in Sedimentary Matrix) — sedimentary

Pyrite Concretion

Iron Sulfide (FeS2) in Sedimentary Matrix

Jade (Jadeite or Nephrite) — Mineral/Mineraloid

Jade

Jadeite or Nephrite

Mineral/Mineraloid

Petrified Wood (Silicified Wood (primarily Quartz / Chalcedony: SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Red Coral (Corallium rubrum) — gemstone

Red Coral

Corallium rubrum

Likely bituminous coal (Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image) — sedimentary

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Opalite (Man-made Glass (SiO2 + additives)) — mineraloid (synthetic)

Opalite

Man-made Glass (SiO2 + additives)

mineraloid (synthetic)

Smurf Rock (Fictional Interpretation) (Cyanus Anthropomorphicus (Geologic Simulation)) — Artificial/Fantasy Object

Smurf Rock (Fictional Interpretation)

Cyanus Anthropomorphicus (Geologic Simulation)

Artificial/Fantasy Object

Pearl (Calcium Carbonate (CaCO3) - Aragonite/Calcite) — mineral

Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite

Amber (Organic gemstone (Succinite)) — mineral

Amber

Organic gemstone (Succinite)

Sedimentary Rock (Limestone or Siltstone pebble) (Sedimentary rock fragment) — sedimentary

Sedimentary Rock (Limestone or Siltstone pebble)

Sedimentary rock fragment

Amber (Succinates (Organic Gemstone)) — mineral

Amber

Succinates (Organic Gemstone)

Amber (Succinite (fossilized resin, C10H16O)) — mineral

Amber

Succinite (fossilized resin, C10H16O)

Pearl (Calcium carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Pearl

Calcium carbonate (CaCO3) in the form of Aragonite or Calcite

Hag Stone (Perforated Sedimentary Rock (typically Flint or Limestone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (typically Flint or Limestone)

Orthoceras Fossil Limestone (Orthoceras (extinct Cephalopod fossil) in Matrix) — sedimentary

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Fossilized Rugose Coral (Horn Coral) (Order Rugosa) — sedimentary

Fossilized Rugose Coral (Horn Coral)

Order Rugosa

Coquina / Shelly Limestone (Coquina (Biogenic Limestone)) — sedimentary

Coquina / Shelly Limestone

Coquina (Biogenic Limestone)

Baltic Amber (Succinite (Fossilized Tree Resin)) — fossil

Baltic Amber

Succinite (Fossilized Tree Resin)

Human Skin (Epidermis/Dermis) (Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)) — Mineral-like biological tissue

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue