Rock Identifier

Category

Organic Crystal (Mineraloid)

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

Limestone with Fossil Fragment (Sedimentary carbonate rock (CaCO3)) — sedimentary

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

sedimentary
Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

mineral
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

gemstone
Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

sedimentary
Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary
Sea Shell (Mollusk Shell) (Calcium Carbonate (Aragonite/Calcite)) — fossil

Sea Shell (Mollusk Shell)

Calcium Carbonate (Aragonite/Calcite)

fossil
Fossiliferous Limestone (Biogenic Sedimentary Rock) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock

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

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

sedimentary
Chert (Jasper/Flint variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

sedimentary
Amber (Amber (Fossilized Tree Resin)) — mineral

Amber

Amber (Fossilized Tree Resin)

mineral
Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

mineral
Fossil Shell (Brachiopod or Mollusk fossil) — fossil

Fossil Shell

Brachiopod or Mollusk fossil

fossil
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Aragonite crystal cluster (Aragonite, orthorhombic calcium carbonate (CaCO₃)) — mineral

Aragonite crystal cluster

Aragonite, orthorhombic calcium carbonate (CaCO₃)

mineral
Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

sedimentary
Amber (Succinite (amorphous organic polymer)) — mineral

Amber

Succinite (amorphous organic polymer)

mineral
Amber (Succinates (Organic Fossilized Resin)) — mineral

Amber

Succinates (Organic Fossilized Resin)

mineral
Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

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

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

sedimentary
Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

sedimentary
Fossiliferous Limestone (Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)

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

Chert (Flint)

Silicon Dioxide (SiO2)

sedimentary
Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

mineral
Precious Red Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

mineral
Sandstone (Weathered Coastal Boulder) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Weathered Coastal Boulder)

Arenite (composed primarily of SiO2)

sedimentary
Glendonite (Calcite Pseudomorph after Ikaite) (Calcite (CaCO3) pseudomorph after Ikaite (CaCO3·6H2O)) — mineral

Glendonite (Calcite Pseudomorph after Ikaite)

Calcite (CaCO3) pseudomorph after Ikaite (CaCO3·6H2O)

mineral
Shungite (Non-crystalline carbon (allotrope of carbon)) — metamorphic

Shungite

Non-crystalline carbon (allotrope of carbon)

metamorphic
Jasper (Chalcedony (SiO2)) — mineral

Jasper

Chalcedony (SiO2)

mineral
Chert (Flint) (Chert (Microcrystalline or cryptocrystalline Quartz - SiO2)) — sedimentary

Chert (Flint)

Chert (Microcrystalline or cryptocrystalline Quartz - SiO2)

sedimentary
Chert (Flint) (Microcrystalline silica (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline silica (SiO2)

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Limestone with Gastropod Fossil (Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion) — fossil

Limestone with Gastropod Fossil

Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion

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

Petrified Wood

Silicified Wood (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

metamorphic
Amber (Succinate (Fossilized Tree Resin)) — fossil

Amber

Succinate (Fossilized Tree Resin)

fossil
Fossiliferous Limestone with Rugose Coral (Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)) — sedimentary

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)

sedimentary
Fossilized Wood (Petrified Wood) and Associated Rocks (Silicified Wood / Xylopal) — fossil

Fossilized Wood (Petrified Wood) and Associated Rocks

Silicified Wood / Xylopal

fossil
Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

mineral