Rock Identifier

Category

Mineraloid (Organic)

Browse mineraloid (organic) specimens identified by the Rock Identifier community.

Opaline Glass (Opalite) (Synthetic Silicon Dioxide Glass) — Mineraloid (Man-made)

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Mineraloid (Man-made)

Slag (Industrial Glass/Metal Waste) (Artificial silicate/ferro-silicate byproduct) — Mineraloid (Industrial byproduct)

Slag (Industrial Glass/Metal Waste)

Artificial silicate/ferro-silicate byproduct

Mineraloid (Industrial byproduct)

Man-made Crystal (Lead Glass) (Lead oxide-doped Silica Glass (approx. SiO2 + PbO)) — Mineraloid/Synthetic Material

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Mineraloid/Synthetic Material

Ferruginous Slag (Iron Smelting Byproduct) (Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)) — Mineraloid/Anthropogenic (Technofossil)

Ferruginous Slag (Iron Smelting Byproduct)

Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)

Mineraloid/Anthropogenic (Technofossil)

Fossil Coral (Honeycomb Coral) (Favosites (extinct genus of Tabulate coral)) — sedimentary

Fossil Coral (Honeycomb Coral)

Favosites (extinct genus of Tabulate coral)

Chert (Gravel pebble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Gravel pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Pearl (Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)) — mineral

Pearl

Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)

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

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Jasper

Jasper (Silicon Dioxide, SiO2)

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

Chert / Flint

Silicon Dioxide (SiO2)

Chert (often called Jasper or River Rock) (Chert (SiO2)) — sedimentary

Chert (often called Jasper or River Rock)

Chert (SiO2)

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

Yellow Chert (Jasper)

Silicon Dioxide (SiO2)

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

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (primarily Chalcedony or Quartz, SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Chert Nodule (Fossiliferous Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (Fossiliferous Chert)

Microcrystalline Quartz (SiO2)

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

Red Chert (Jasper)

Microcrystalline Quartz (SiO2)

Agatized Fossil or Chalcedony Nodule (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Agatized Fossil or Chalcedony Nodule

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

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

Chert (Jasper transition)

Microcrystalline Quartz (SiO2)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Jasperoid) (Chert (chemically precipitated microcrystalline Quartz, SiO2)) — sedimentary

Chert (Jasper/Jasperoid)

Chert (chemically precipitated microcrystalline Quartz, SiO2)

Chert (Yellow Jasper/Flint) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Calamites Fossil) (Calamites sp. (Silicified/Permineralized Plant Fossil)) — sedimentary

Petrified Wood (Calamites Fossil)

Calamites sp. (Silicified/Permineralized Plant Fossil)

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

Chert / Flint

Silicon Dioxide (SiO2)

Chert (Flint) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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

Petrified Wood

Silicified Wood (primarily SiO2)

Geode (unopened) (Chert / Chalcedony Geode (SiO2)) — sedimentary

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (varieties include Flint and Mudstone) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (varieties include Flint and Mudstone)

Microcrystalline Silica (SiO2)

Chert (specifically Flint or Novaculite variant) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (specifically Flint or Novaculite variant)

Chert (Microcrystalline Quartz, SiO2)

Chert (Pebble) (Microcrystalline silica (SiO2)) — sedimentary

Chert (Pebble)

Microcrystalline silica (SiO2)

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

Chert (and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite Geode (Sparkling Druzy) (Iron Sulfide (FeS2) in Sedimentary Nodule) — mineral

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Chert (containing Iron Oxide spots) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (containing Iron Oxide spots)

Microcrystalline Quartz (SiO2)

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

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Pebble) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (Pebble)

Chert (Microcrystalline Quartz, SiO2)

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

Jasper with Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Pearl (Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3) — mineral

Pearl

Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3

Petrified Wood (Silicon Dioxide (SiO2) - Calcified / Silicified Wood) — sedimentary

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Fossilized Dinosaur Skull (Tyrannosaurus rex) (Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica) — sedimentary

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica