Rock Identifier

Category

Sedimentary (Alluvial Deposit)

Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.

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

Chert (Flint)

Chert (SiO2)

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

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

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

Aragonite (Banded Calcite / 'Mexican Onyx')

Aragonite (Calcium Carbonate - CaCO3)

Limonite (Limonite (FeOO·nH2O)) — mineral

Limonite

Limonite (FeOO·nH2O)

Selenite (Satin Spar) (Gypsum (CaSO4·2H2O)) — mineral

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Glauconite ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2) — mineral

Glauconite

(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Red Jasper (beads) (Silicon Dioxide (SiO2) with iron inclusions) — Sedimentary Rock

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Sedimentary Rock

Picture Jasper (Silicon Dioxide (SiO2)) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2)

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

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Amber with inclusion (Amber (Fossilized Tree Resin)) — mineral

Amber with inclusion

Amber (Fossilized Tree Resin)

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

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Red Chert (Jasper) (Cryptocrystalline Quartz (SiO2) with iron oxide inclusions) — sedimentary

Red Chert (Jasper)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Fossilized Horn Coral (Rugosa) — fossil

Fossilized Horn Coral

Rugosa

Chert (varieties include Flint and Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

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

Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Quartz Geode/Cluster (Quartz (SiO2)) — mineral

Quartz Geode/Cluster

Quartz (SiO2)

Sandstone (Arenite (composed primarily of Quartz: SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Dendritic Siltstone (or Mudstone) (Siltstone with Manganese Oxide dendrites) — sedimentary

Dendritic Siltstone (or Mudstone)

Siltstone with Manganese Oxide dendrites

White Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Red Quartz (Carnelian/Red Jasper Agate) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Red Quartz (Carnelian/Red Jasper Agate)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Gastropod Steinkern (Internal Mold Fossil) (Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix) — sedimentary

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Agate Geode Slice (with Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)) — Mineral

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Botryoidal Hematite (Kidney Ore) (Hematite (Fe2O3)) — Mineral

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Agate (or Chalcedony) (SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz) — Mineral

Agate (or Chalcedony)

SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz

Amethyst (Quartz (SiO2) variety) — Mineral

Amethyst

Quartz (SiO2) variety

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

Geode (unopened)

Silica-filled Concretion (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (Common Opal/Jasper variety) (Microcrystalline Quartz (SiO2) with hydration) — sedimentary

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2) with hydration

Sandstone (likely Graywacke or Lithic Sandstone) (Arenite / Wacke (SiO2 based with lithic fragments)) — sedimentary

Sandstone (likely Graywacke or Lithic Sandstone)

Arenite / Wacke (SiO2 based with lithic fragments)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Amber (Amber (C10H16O)) — mineral

Amber

Amber (C10H16O)

Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead) (Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)) — Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)

Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)

Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)

Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

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

Opal

Hydrous silicon dioxide (SiO2·nH2O)

Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx) (Calcium Carbonate (CaCO3)) — mineral

Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx)

Calcium Carbonate (CaCO3)

Halite (Rock Salt) (Halite (NaCl)) — mineral

Halite (Rock Salt)

Halite (NaCl)

Green Jasper (Silicon Dioxide (SiO2) with iron silicate inclusions) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Aragonite (Sputnik habit) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite (Sputnik habit)

Aragonite (Calcium Carbonate, CaCO3)

Celestite (Celestine) (Strontium sulfate (SrSO4)) — mineral

Celestite (Celestine)

Strontium sulfate (SrSO4)