Sedimentary (Chemically Precipitated Mineral)

Jasper

Jasper (Silicate mineral, SiO2)

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Celestine (or Celestite)

Celestine (Strontium Sulfate, SrSO4)

Moss Agate / Carnelian Agate

Silicon Dioxide (SiO2) with iron and manganese inclusions

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Red Jasper (Brecchiated Jasper)

Silicon Dioxide (SiO2) with Hematite impurities

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Fluorite, Turquoise, and Calcite set

Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)

Septarian Nodule

Septarian concretion (Complex mixture of Siderite/Limestone, Calcite, and Aragonite)

Sandstone with Iron Concretion

Arenite with Limonite/Goethite Concretion

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)

Limonite Concretion (Ironstone)

Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)

Red Ochre (Hematite-rich Clay)

Limonitic/Hematitic Claystone (Fe2O3 with clay minerals)

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Chert (Iron-stained or Jasperoid)

Microcrystalline Quartz (SiO2)

Basalt with Calcite Veins

Basalt (Mafic Volcanic Rock)

Quartzite with Iron Banding

Metamorphosed Quartz-rich Sandstone (SiO2 with Fe2O3 inclusions)

Bauxite

Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))

Banded Chert (River Stone)

Silicon Dioxide (SiO2)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Chert (Silicon Dioxide, SiO2)

Chert (Field Stone/Jasper variety)

Microcrystalline Quartz (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz Geode in Sedimentary Matrix

Silicon Dioxide (SiO2) within a limestone/dolostone host

Ferruginous Sandstone

Sandstone with Iron Oxide (Limonite/Goethite)

Limonite (Ochreous)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)