Mineral And Sedimentary

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Sandstone Concretion

Sedimentary Concretion (SiO2 or CaCO3 cemented)

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

Jasper with Iron Staining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Concretion with Quartz Veining

Septarian Concretion (CaCO3 / SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Amethyst (Raw Quartz)

Silicon Dioxide (SiO2) with iron impurities

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Sandstone

Clastic Sedimentary Rock (primarily SiO2)

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Banded Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartzite and Feldspar grains)

Turquoise

Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Sandstone

Arenite (primarily SiO2)

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Sandstone Geode (Unbroken)

Siliciclastic sedimentary rock (primarily Quartz)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (Ferruginous)

Arenite (SiO2 with Iron Oxide impurities)

Tree Agate

Dendritic Chalcedony (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Limonite (Gozzany Iron)

Limonite (FeO(OH)·nH2O)

Herkimer Diamond (Quartz Crystal)

Silicon Dioxide (SiO2)

Sandstone (Pebble)

Clastic sedimentary rock (SiO2 primary)

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Schist

Mica Schist

River Pebble (Brecciated Chert/Siltstone)

Silicon Dioxide (SiO2) with mineral inclusions

Black Jasper

Black Jasper (Silicate mineral - SiO2)

Pyrite in Limestone

Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)

Ferruginous Quartz

Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Milky Quartz / Rose Quartz fragment

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

Bauxite

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