Rock Identifier

Category

Mineral (Silicate Replaced Organic Material)

Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.

Learn about Mineral (Silicate Replaced Organic Material) in the encyclopedia

Calc-Silicate Rock

Calc-Silicate Rock

Talc

Eltyubyuite

Peat

Paracelsian

Black Shale

Petrified Wood

Banalsite

Hemimorphite

Mica

Shattuckite

Skarn

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

Chert (variations include Flint)

Silicon Dioxide (SiO2)

Chert Nodules or Concretion (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Nodules or Concretion

Cryptocrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

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

Petrified Wood

Silicified Wood / Xylopal (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Bivalve seashell (Calcareous shell, primarily aragonite (CaCO₃); likely a modern cockle or related bivalve) — fossil

Bivalve seashell

Calcareous shell, primarily aragonite (CaCO₃); likely a modern cockle or related bivalve

Fossil Shark Tooth (Chondrichthyes tooth fossil) — fossil

Fossil Shark Tooth

Chondrichthyes tooth fossil

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Red Jasper with Quartz (Microcrystalline Quartz (SiO2)) — sedimentary

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

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

Chert (Jasper/Limonitic Chert)

Microcrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Fossil Coral (Phylum Cnidaria / Rugosa or Tabulata) — fossil

Fossil Coral

Phylum Cnidaria / Rugosa or Tabulata

Fossilized Shark Tooth (Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))) — fossil

Fossilized Shark Tooth

Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))

Petrified Wood (Silicified wood (primarily Quartz/Chalcedony, SiO2)) — mineral

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Agatized Dinosaur Bone (Permineralized Dinosaur Bone (Silicified/Agatized Bone)) — fossil

Agatized Dinosaur Bone

Permineralized Dinosaur Bone (Silicified/Agatized Bone)

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

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Shark Tooth Fossil (Chondrichthyes (class) fossilized tooth) — fossil

Shark Tooth Fossil

Chondrichthyes (class) fossilized tooth

Epidosite (Epidosite (Metasomatic calcium-aluminum silicate rock)) — metamorphic

Epidosite

Epidosite (Metasomatic calcium-aluminum silicate rock)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Polished banded agate (likely picture jasper or petrified wood) (Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions) — gemstone

Polished banded agate (likely picture jasper or petrified wood)

Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions

Jasper (Petrified Wood variant) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

Fossil Shark Tooth (Chondrichthyes (Class)) — fossil

Fossil Shark Tooth

Chondrichthyes (Class)

Fossilized Shark Tooth (Basal Bone) (Otodus sp. (Mineralized Hydroxyapatite)) — sedimentary

Fossilized Shark Tooth (Basal Bone)

Otodus sp. (Mineralized Hydroxyapatite)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Agatized/Silicified Wood) (Silicified Paleoxylon (primarily SiO2)) — sedimentary

Petrified Wood (Agatized/Silicified Wood)

Silicified Paleoxylon (primarily SiO2)

Chert (often called Flint) (Microcrystalline to cryptocrystalline quartz (SiO2)) — sedimentary

Chert (often called Flint)

Microcrystalline to cryptocrystalline quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Poppy Jasper (Microcrystalline Quartz (SiO2) with hematite and other inclusions) — sedimentary

Poppy Jasper

Microcrystalline Quartz (SiO2) with hematite and other inclusions

Jasper (Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)) — sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)

Polished fossilized wood (petrified wood), likely agatized (Silicified wood; predominantly microcrystalline quartz/chalcedony (SiO₂), with iron-oxide coloration) — fossil

Polished fossilized wood (petrified wood), likely agatized

Silicified wood; predominantly microcrystalline quartz/chalcedony (SiO₂), with iron-oxide coloration

Jasper with Chert (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper with Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Green Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Chert (often found as Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Yellow Chert (Chalcedony)

Microcrystalline Quartz (SiO2)