Sedimentary (Chemically Precipitated Mineral)

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Banded Onyx (Mexican Onyx / Travertine)

Calcite (CaCO3) - Banded Travertine

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limonite (Iron Stone Concretion)

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

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (primarily CaCO3 as Calcite or Aragonite)

Bauxite

Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Limonite)

Orange Calcite point

Calcite (Calcium Carbonate, CaCO3)

Bauxite

Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Banded Iron Formation (BIF)

Banded Iron Formation

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Chert (Tan/Grey)

Chert (Silicon Dioxide, SiO2)

Chert (with Quartz veins)

Microcrystalline quartz (SiO2)

Chert (and Chalcedony)

Microcrystalline Quartz (SiO2)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Graphite

Graphite (Chemical Formula: C)

River Pebble (Quartz/Jasper)

Silicon Dioxide (SiO2)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Pyrite

Iron Disulfide (FeS2)

Iron-stained Quartzite / Chert

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Limonite and Goethite encrusted Chert/Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert (Jasper variation)

Silicon dioxide (SiO2)

Chert (and Limestone)

Silicon Dioxide (SiO2)

Gold Grain

Native Gold (Au)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)