Rock Identifier

Category

Sedimentary (Formed From Silica Deposits)

Browse sedimentary (formed from silica deposits) specimens identified by the Rock Identifier community.

Celestite (Celestine) Geode (Strontium Sulfate (SrSO4)) — mineral

Celestite (Celestine) Geode

Strontium Sulfate (SrSO4)

Banded Calcite (Mexican Onyx) (Calcium Carbonate (CaCO3)) — sedimentary

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Sandstone (Sandstone (various mineral compositions)) — Sedimentary

Sandstone

Sandstone (various mineral compositions)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Flint (within Limestone matrix) (Silicon dioxide (SiO2)) — sedimentary

Flint (within Limestone matrix)

Silicon dioxide (SiO2)

Geode (unopened) or Calcareous Nodule (Siliceous or Calcareous Concretion/Nodule) — sedimentary

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Carnelian (a variety of Chalcedony) (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Carnelian (a variety of Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Fossilized Oyster Shell (Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)) — sedimentary

Fossilized Oyster Shell

Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Limestone with Chert or Siltstone bands (Sedimentary carbonate rock (CaCO3) often with siliceous impurities) — sedimentary

Limestone with Chert or Siltstone bands

Sedimentary carbonate rock (CaCO3) often with siliceous impurities

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

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (and/or River Pebble) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (and/or River Pebble)

Microcrystalline quartz (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

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

Chert / Flint

Chert (Silicon Dioxide, SiO2)

Chert (specifically a Chert Nodule or Flint) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically a Chert Nodule or Flint)

Cryptocrystalline Quartz (SiO2)

Carnelian (a variety of Chalcedony) (SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz) — mineral

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

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

Chert (Field Flint)

Microcrystalline Quartz (SiO2)

Druzy Quartz on Sandstone (Silicon Dioxide (SiO2) with Quartz crystals) — sedimentary

Druzy Quartz on Sandstone

Silicon Dioxide (SiO2) with Quartz crystals

Amber (Amber (C10H16O)) — mineral

Amber

Amber (C10H16O)

Jasper with Iron Inclusions (Silicon Dioxide (SiO2) with impure Iron Oxides) — sedimentary

Jasper with Iron Inclusions

Silicon Dioxide (SiO2) with impure Iron Oxides

Chert (Honey Chert or Chalcedony Pebble) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Honey Chert or Chalcedony Pebble)

Cryptocrystalline Quartz (SiO2)

Jasper (Red and Tan Jasper) (Microcrystalline Quartz (SiO2) with iron oxide inclusions) — sedimentary

Jasper (Red and Tan Jasper)

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Aragonite (Banded Calcite / 'Mexican Onyx') (Aragonite (Calcium Carbonate - CaCO3)) — mineral

Aragonite (Banded Calcite / 'Mexican Onyx')

Aragonite (Calcium Carbonate - CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Yellow Agate (Chalcedony (cryptocrystalline Quartz), SiO2) — mineral

Yellow Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Jasper (Multi-colored) / Sea Glass Slag (Silicon Dioxide (SiO2) with impurities of Iron Oxide) — Sedimentary (if natural Jasper) or Artificial (if Slag)

Jasper (Multi-colored) / Sea Glass Slag

Silicon Dioxide (SiO2) with impurities of Iron Oxide

Sedimentary (if natural Jasper) or Artificial (if Slag)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Opal (Hydrous silicon dioxide (SiO2·nH2O)) — mineral

Opal

Hydrous silicon dioxide (SiO2·nH2O)

Yellow Jasper (Tectosilicates (SiO2) with Goethite/Iron oxide inclusions) — sedimentary

Yellow Jasper

Tectosilicates (SiO2) with Goethite/Iron oxide inclusions

Chert Nodule (River Cobble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (River Cobble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (River Pebble) (Chert (SiO2)) — sedimentary

Chert (River Pebble)

Chert (SiO2)

Green Jasper (Silicon Dioxide (SiO2)) — sedimentary

Green Jasper

Silicon Dioxide (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Native Copper (Native Copper (Cu)) — mineral

Native Copper

Native Copper (Cu)

Red Howlite (Dyed) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye) — mineral

Red Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye

Jasper (Chalcedony (cryptocrystalline quartz), SiO2) — Sedimentary

Jasper

Chalcedony (cryptocrystalline quartz), SiO2

Mudstone (Lutylite (group of fine-grained sedimentary rocks)) — sedimentary

Mudstone

Lutylite (group of fine-grained sedimentary rocks)

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

Chert / Jasper

Silicon Dioxide (SiO2)