Chert / Flint Pebble
Microcrystalline quartz (SiO2)
Category
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Chert / Flint Pebble
Microcrystalline quartz (SiO2)
Flint / Chert Pebble
Microcrystalline quartz (SiO2)
Flint / Chert Nodule
Microcrystalline quartz (SiO2)
Flint / Chert
Microcrystalline Quartz (SiO2)
Flint / Chert (Hag Stone)
Silicon Dioxide (SiO2)
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
Flint
SiO2 (Microcrystalline Quartz / Chert)
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
Gneiss (Banded Gneiss)
Gneiss
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
Siltstone with iron staining
Siltstone (primarily SiO2 with FeO(OH) coatings)
Chert (Chalcedony-rich sedimentary rock)
Cryptocrystalline Quartz (SiO2)
Flint Nodule
Microcrystalline Quartz (SiO2)
Banded Gneiss
Gneiss (Metamorphic Rock)
Pyrite
Iron Sulfide (FeS2)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
Sandstone (Fluvial Pebble)
Arenite
Pyrite
Iron Disulfide (FeS2)
Agate (specifically a Blue Agate Geode Slice)
Chalcedony (cryptocrystalline variety of Quartz); SiO2
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
Sandstone
Arenite (lithic or quartz sandstone)
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
Banded Gneiss
Gneiss
Magnetite
Iron(II,III) oxide (Fe3O4)
Jasper
Microcrystalline Quartz (SiO2)
Flint Arrowhead
Cryptocrystalline quartz (Chert/Flint, SiO2)
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
Jasper
Silicon dioxide (SiO2)
Chert (Jasper variation)
Silicon Dioxide (SiO2)
Chert (Siliceous Siltstone/Quartzite)
Silicon dioxide (SiO2)
Jasper
Silicon dioxide (SiO2)
Chert (Nodular Chert)
Microcrystalline Quartz (SiO2)
Chert (Common Opal variant)
Microcrystalline Quartz (SiO2)
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2)
Chert (Jasper/Agate variant)
Microcrystalline Quartz (SiO2) with iron oxide inclusions
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
Chert (Flint Nodular Variety)
Microcrystalline Quartz (SiO2)
Chert (specifically Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (and Flint)
Silicon Dioxide (SiO2)
Agate
Silicon Dioxide / Cryptocrystalline Quartz (SiO2)