Industrial Byproduct (Anthropogenic Material)

Breccia

Breccia

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Opalite

Man-made Synthetic Glass (Silicon Dioxide with metal additives)

Chert (Jasper/River Stone)

Silicon dioxide (SiO2) - Microcrystalline quartz

Desert Rose (Sand Barite/Gypsum Rose)

Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)

Agate (Chert/Chalcedony)

Cryptocrystalline Quartz (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Blue Apatite

Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Quartzite (River Cobble)

Metamorphosed Quartz Sandstone (SiO2)

Crushed Limestone

Calcium Carbonate (CaCO3)

Pumice

Pumice (a highly vesicular extrusive volcanic rock)

Bauxite (Concretionary)

Bauxite (Al(OH)3, AlO(OH))

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Lignite (Brown Coal)

Lignite (C189H155O6N3S)

Quartzite

Quartzite (primarily SiO2)

Bauxite

Bauxite (Al2O3·nH2O)

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

Basalt

Basalt (predominantly Plagioclase Feldspar and Pyroxene)

Yellow Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Yellow Jasper

Silicon Dioxide (SiO₂)

Yellow Ocher (Limonite)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Chert (Jasper nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Yellow/Honey Jasper variety)

Cryptocrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

Fossil Shell (Bivalve)

Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Chert (and Petrified Wood)

Silicon Dioxide (SiO2)

Ironstone Concretion (Iron-rich Mudstone)

Siderite / Geothite concretion (FeCO3 / FeO(OH))

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)