Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
Category
Browse mineral (biogenic replacement) specimens identified by the Rock Identifier community.
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron Oxide inclusions)
Petrified Wood
Silicified Wood (SiO2)
Tiger's Eye (and Hematite/Jasper Matrix)
SiO2 (Pseudomorph of Quartz after Crocidolite) with Hematite/Magnetite
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Jasper with Quartz Vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class); commonly Clypeasteroida for sand dollar types
Jasper
Jasper (Silicate mineral, SiO2)
Chert (Limestone-based)
Silicon dioxide (SiO2)
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
Galena
Lead Sulfide (PbS)
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
Celestite (Celestine)
Strontium sulfate (SrSO4)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
Blue Tiger's Eye
Silicon Dioxide (SiO2) with Crocidolite inclusions
Orthoceratid Fossil in Limestone
Orthoceras (extinct genus of Nautiloid Cephalopod)
Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Fossilized Brachiopod
Phylum Brachiopoda (General mineral composition: Calcite/CaCO₃ or Silica/SiO₂)
Chert (often called Flint in this context)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
Chert (Nodule)
Silicon Dioxide (SiO2)
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
Chalcedony (specifically Agate or Water-worn Quartzite)
Silicon Dioxide (SiO2)
Tiger's Eye (Rough Slab)
Pseudomorph of Quartz after Crocidolite (SiO2 with Fe-containing inclusions)
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Chert / Flint Nodules
Cryptocrystalline Quartz (SiO2)
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Chert (specifically Jasper/Carnelian Agate)
Microcrystalline Quartz (SiO2)
Tiger's Eye (Blue-Gold transition)
Pseudomorph of Quartz after Crocidolite (SiO2)
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2 with iron oxide inclusions)
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
Chert (Chert / Flint)
Silicon Dioxide (SiO2)
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Yellow Chert (Gold-colored River Pebble)
Microcrystalline Quartz (SiO2) with Limonite/Goethite staining
Petrified Wood
Silicified Wood (primarily SiO2)