Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or River Stone)

Chert (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Basalt with Epidote Veins

Mafic Igneous Rock (Basalt)

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

Chert / Chalcedony

Microcrystalline Quartz (SiO2)

Chert (specifically a stream-worn Chert Nodule)

Sedimentary Cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2) with hydration

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Limestone

Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Yellow or Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (River Stone/Pebble)

Chert (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Arid Sandy Loam

Arenosols / Regosols

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Chert (Grey Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (specifically Chert/Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Chert (with Quartz)

Microcrystalline Quartz (SiO2)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Oolitic Chert

Silicon Dioxide (SiO2) with Oolitic texture

Amber-bearing Coal/Sedimentary Rock

Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)

Rough Garnet in Matrix

Almandine Garnet (Fe3Al2Si3O12)

Sandstone (with Siltstone/Greywacke variations)

Sedimentary Rock (Clastic)

Quartz (Druzy or Geode fragment)

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Al2O3·2H2O)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Unakite

Epidotized Granite

Limestone (with Calcite Veining)

Calcium Carbonate (CaCO3)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Chert (Nodule)

Silicon Dioxide (SiO2)

Limestone (Porous/Travertine variant)

Sedimentary Calcium Carbonate (CaCO3)