Organic (Sedimentary Context)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically a Chert Nodule or Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Chert (Blue-Gray Chert)

Microcrystalline quartz (SiO2)

Chert (Jasper/Ironstone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Arrowhead Preform or Point)

Chert (Microcrystalline Quartz, SiO2)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Jasper (specifically Yellow Jasper and Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Chert (Iron-stained)

Chert (SiO2)

Fossil Shark Tooth

Carcharodon sp. (likely Otodus or similar Lamniformes order)

Chert (variations include Flint)

Chert (SiO2)

Amber (in Matrix/Shale)

Amber (Fossilized Tree Resin)

Pyrite

Iron Sulfide (FeS2)

Chalcedony (Botryoidal or Tumbled)

Chalcedony (SiO₂)

Pyrite in Shaly Matrix

Iron Sulfide (FeS2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (Yellow Chert/Flint)

Silicon Dioxide (SiO2)

Chert (Jasper-like Silicate)

Microcrystalline quartz (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)

Chert (and/or Chalcedony)

Microcrystalline Silica (SiO2)

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Jasper focus)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Jasper

Cryptocrystalline Quartz (SiO2)

Jasper

Jasper (Cryptocrystalline variety of Quartz, SiO2)

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Chert (White Chert)

Silicon Dioxide (SiO2)

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Graphite

Graphite (Chemical Formula: C)