Limestone with Lichen
Sedimentary Calcium Carbonate (CaCO3)
Category
Browse sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate) specimens identified by the Rock Identifier community.
Limestone with Lichen
Sedimentary Calcium Carbonate (CaCO3)
Chert (Pebble)
Microcrystalline silica (SiO2)
Jasper (specifically a banded or dark variety)
Silicon Dioxide (SiO2) with impurities
Chert Concretion
Sedimentary Cryptocrystalline Quartz (SiO2)
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
Chert (specifically White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (and/or River Pebble)
Microcrystalline silica (SiO2)
Chert (White/Light Tan)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Flint variety)
Chert (SiO2)
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
Chert (or Flint)
Chert (Sedimentary Cryptocrystalline Sio2)
Quartzite
Metamorphic Quartzite (SiO2)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Sandstone (Ferruginous)
Arenite (SiO2 based with Fe2O3 banding)
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
Chert (specifically Gray Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (often called Jasper or River Siltstone)
Microcrystalline Quartz (SiO2)
Likely quartz-rich rock fragment
Quartz (SiO₂), possibly iron-stained or mixed with feldspar
Chert / Flint
Microcrystalline Quartz (SiO2)
Chert (Jasper focus)
Silicon dioxide (SiO2) - Microcrystalline Quartz
Chert (Jasper-like Siliceous Rock)
Chert (Silicon Dioxide, SiO2)
Chert (Yellow Jasper)
Silicon dioxide (SiO2) with iron oxide inclusions
Yellow Calcite
Calcium Carbonate (CaCO3)
Chert (Jasper variation)
Silicon Dioxide (SiO2)
Chert (often called Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
Travertine (Tufa)
Chemical Sedimentary Rock / Travertine (CaCO3)
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Quartz Pebble
Silicon Dioxide (SiO2)
Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
Jasper and Yellow Chert (Tumbled)
Microcrystalline Quartz (SiO2)
Limestone
Calcareous sedimentary rock (CaCO3)
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
Chert (variably called Jasper or Agate)
Microcrystalline Quartz (SiO2)
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
Chert (Flint/Jasper variety)
Silicon Dioxide (SiO2)
Chert (often called Jasper or River Siltstone)
Microcrystalline Quartz (SiO2)
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
Weathered chert or siliceous limestone
Microcrystalline quartz (SiO₂), possibly with carbonate minerals
Chert / Flint Arrowheads
Cryptocrystalline Quartz (SiO2)
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)