Rock Identifier

Category

Sedimentary (Formed From Silica Deposits)

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

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartzite Pebble (River Rock) (Quartzite (mainly SiO2)) — metamorphic

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (specifically a Worked Flint/Knapped Flake) (Chert / Flint (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Banded Agate (Agate (Cryptocrystalline Quartz, SiO2)) — mineral

Banded Agate

Agate (Cryptocrystalline Quartz, SiO2)

Dendritic Agate (also known as Dendritic Siltstone or Mudstone) (Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)) — sedimentary

Dendritic Agate (also known as Dendritic Siltstone or Mudstone)

Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)

Green Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Green Chert

Microcrystalline Quartz (SiO2)

Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (and/or Flint) (Silicon dioxide (SiO2)) — sedimentary

Chert (and/or Flint)

Silicon dioxide (SiO2)

Banded Agate (Tumbled) (Agate (Variety of Chalcedony/Quartz), SiO2) — mineral

Banded Agate (Tumbled)

Agate (Variety of Chalcedony/Quartz), SiO2

Agate (Chert/Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Banded Iron Formation (Banded Iron Formation (BIF)) — sedimentary

Banded Iron Formation

Banded Iron Formation (BIF)

Chert (often referred to as 'Jasper' when red) (Chert (microcrystalline quartz, SiO₂)) — Sedimentary rock

Chert (often referred to as 'Jasper' when red)

Chert (microcrystalline quartz, SiO₂)

Sedimentary rock

Jasper (likely Polychrome or Desert Jasper) (Silicon Dioxide (SiO2) with impurities) — sedimentary (chemically precipitated mineral)

Jasper (likely Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with impurities

sedimentary (chemically precipitated mineral)

Red Jasper (possibly Brecciated Jasper or Bloodstone variety) (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Red Jasper (possibly Brecciated Jasper or Bloodstone variety)

Jasper (Silicon Dioxide, SiO2)

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

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Amethyst (Amethyst (SiO2 - Silicon Dioxide with iron impurities)) — mineral

Amethyst

Amethyst (SiO2 - Silicon Dioxide with iron impurities)

Jasper (likely Polychrome or Mookaite variants) (Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions) — sedimentary (chemically precipitated)

Jasper (likely Polychrome or Mookaite variants)

Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions

sedimentary (chemically precipitated)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Jasper-Agate Breccia (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper-Agate Breccia

Silicon Dioxide (SiO2) with iron oxide inclusions

Common Opal (Green Opal / Pistachio Opal) (Hydrated silica (SiO2·nH2O)) — mineraloid

Common Opal (Green Opal / Pistachio Opal)

Hydrated silica (SiO2·nH2O)

Yellow Jasper (Jasper (Silicon Dioxide, SiO2 plus various mineral impurities)) — sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2 plus various mineral impurities)

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

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper pebble (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper pebble

Jasper (Silicon Dioxide, SiO2)

Carnelian Agate (Carnelian (Silicon Dioxide, SiO2)) — mineral

Carnelian Agate

Carnelian (Silicon Dioxide, SiO2)

Carnelian (Carnelian (a variety of Chalcedony, SiO₂)) — Mineral

Carnelian

Carnelian (a variety of Chalcedony, SiO₂)

Quartz on Host Rock (Silicon Dioxide (SiO2)) — Mineral Specimen

Quartz on Host Rock

Silicon Dioxide (SiO2)

Mineral Specimen

Fossilized Bone Fragment (Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)) — sedimentary

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Chert (varietal: Flint/River Pebble) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varietal: Flint/River Pebble)

Cryptocrystalline Quartz (SiO2)

Geode (unopened) (Silica-filled Concretion (SiO2)) — sedimentary

Geode (unopened)

Silica-filled Concretion (SiO2)

Carnelian (Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities) — mineral

Carnelian

Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities

Chert (Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amber (Succinate (Fossilized Tree Resin)) — mineraloid

Amber

Succinate (Fossilized Tree Resin)

Clear Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Jasper (Multi-color Chert) (Silicon dioxide (SiO2)) — sedimentary

Jasper (Multi-color Chert)

Silicon dioxide (SiO2)

Picture Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Carnelian (Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)) — mineral

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)

Yellow Jasper (Silicon dioxide (SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

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

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Red Jasper (River-worn Pebble) (Silicon Dioxide (SiO2) with Ferric Iron inclusions) — sedimentary (microcrystalline silicate)

Red Jasper (River-worn Pebble)

Silicon Dioxide (SiO2) with Ferric Iron inclusions

sedimentary (microcrystalline silicate)