Rock Identifier

Category

Sedimentary (Formed From Silica Deposits)

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

Learn about Sedimentary (Formed From Silica Deposits) in the encyclopedia

Geyserite

Quartzite Sandstone

Quartzite Sandstone

Turbidite

Kambaba Jasper

Tripolite

Sinter

Ignimbrite

Loess

Quartzite

Chert

Coal

Silcrete

Jasper (Silicon dioxide (SiO2) with iron oxide impurities) — sedimentary

Jasper

Silicon dioxide (SiO2) with iron oxide impurities

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

Chert (Chalcedony/Agate variety)

Microcrystalline Quartz (SiO2)

Quartz (Chalcedony/Agate nodule) (Silicon dioxide (SiO2)) — mineral

Quartz (Chalcedony/Agate nodule)

Silicon dioxide (SiO2)

Small gray translucent stone, possibly quartz or glassy mineral (Uncertain; likely microcrystalline quartz (SiO₂), but the image is insufficient for definitive identification) — mineral

Small gray translucent stone, possibly quartz or glassy mineral

Uncertain; likely microcrystalline quartz (SiO₂), but the image is insufficient for definitive identification

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

Jasper

Jasper (Silicon Dioxide, SiO2)

Red Moss Agate or Jasper-Agate (Silicon Dioxide (SiO2)) — mineral

Red Moss Agate or Jasper-Agate

Silicon Dioxide (SiO2)

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Agate (or Operculum / Fossil Shell) (Silicon Dioxide (SiO2)) — mineral

Agate (or Operculum / Fossil Shell)

Silicon Dioxide (SiO2)

Sandstone / Weathered Chert (Silicon Dioxide (SiO2) / Quartz-rich Clastic Rock) — sedimentary

Sandstone / Weathered Chert

Silicon Dioxide (SiO2) / Quartz-rich Clastic Rock

Chert Pebble (Jasperoid/Flint) (Silicon Dioxide (SiO2) - cryptocrystalline quartz) — Sedimentary

Chert Pebble (Jasperoid/Flint)

Silicon Dioxide (SiO2) - cryptocrystalline quartz

Opal cabochon (Hydrated amorphous silica, SiO₂·nH₂O; likely common or synthetic opal) — gemstone

Opal cabochon

Hydrated amorphous silica, SiO₂·nH₂O; likely common or synthetic opal

Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

Chert (Golden/Yellow Variety) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Golden/Yellow Variety)

Microcrystalline Silica (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Quartz geode / druzy quartz (Quartz, silicon dioxide (SiO₂), microcrystalline to crystalline druse) — mineral

Quartz geode / druzy quartz

Quartz, silicon dioxide (SiO₂), microcrystalline to crystalline druse

Jasper (likely Brown or Brecciated) (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper (likely Brown or Brecciated)

Jasper (Silicon Dioxide, SiO2)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

Chert (Quartz Variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Quartz Variety)

Silicon Dioxide (SiO2)

Tumbled brecciated jasper or quartz-rich rock (Brecciated chalcedony/jasper, chiefly microcrystalline SiO₂ with iron-oxide or clay-rich matrix) — mineral

Tumbled brecciated jasper or quartz-rich rock

Brecciated chalcedony/jasper, chiefly microcrystalline SiO₂ with iron-oxide or clay-rich matrix

Red sandstone pebble (Quartz-rich sandstone, likely iron-oxide stained (composition varies)) — sedimentary

Red sandstone pebble

Quartz-rich sandstone, likely iron-oxide stained (composition varies)

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

Green Jasper

Silicon Dioxide (SiO2) with impurities

Red Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Red Chert

Microcrystalline Quartz (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Quartz (Milky/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Polished red jasper (likely hematite-bearing jasper) (Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite) — mineral

Polished red jasper (likely hematite-bearing jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite

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

Jasper

Jasper (Silicon Dioxide, SiO2)

Likely galena (lead sulfide) (Galena, PbS) — mineral

Likely galena (lead sulfide)

Galena, PbS

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Carnelian (Silicon Dioxide (Quartz variety, SiO2)) — mineral

Carnelian

Silicon Dioxide (Quartz variety, SiO2)

Fossilized Shark Tooth (Chondrichthyes (class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (class)

Geode (Quartz / Chalcedony nodule) — sedimentary

Geode

Quartz / Chalcedony nodule

Red jasper (likely iron-stained chert) (Microcrystalline quartz, SiO₂, colored chiefly by iron oxides; identification is provisional from the photo) — sedimentary

Red jasper (likely iron-stained chert)

Microcrystalline quartz, SiO₂, colored chiefly by iron oxides; identification is provisional from the photo

Jasper / Quartzite (SiO2) — sedimentary/metamorphic

Jasper / Quartzite

SiO2

sedimentary/metamorphic

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Orange Quartz (Carnelian / Orange Aventurine) (Silicon Dioxide (SiO2)) — mineral

Orange Quartz (Carnelian / Orange Aventurine)

Silicon Dioxide (SiO2)

Chert or silicified limestone fragment (Microcrystalline quartz (SiO₂), possibly calcareous chert) — sedimentary

Chert or silicified limestone fragment

Microcrystalline quartz (SiO₂), possibly calcareous chert

Chert (Microcrystalline or cryptocrystalline quartz) — sedimentary

Chert

Microcrystalline or cryptocrystalline quartz

River Pebbles (Chert and Quartzite) (Sedimentary Clastic Rock (Silica-rich)) — sedimentary

River Pebbles (Chert and Quartzite)

Sedimentary Clastic Rock (Silica-rich)

Jasper (Iron-stained) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (Iron-stained)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (or Chalcedony) Specimen (Silicon Dioxide (SiO2)) — mineral

Quartz (or Chalcedony) Specimen

Silicon Dioxide (SiO2)

Milky quartz fragment (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)