Mineral Within A Sedimentary Rock

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide - SiO2)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)

Banded Gneiss

Gneiss (variable mineral composition)

Granular Sandstone

Arenite (variable composition, primarily SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Granite (River Pebble)

Phaneritic intrusive igneous rock (Felsic)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sandstone

Arenite (primarily SiO2)

Amethyst

Silicon Dioxide with iron impurities (SiO2)

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Ferruginous Quartz

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

Granodiorite

Granodiorite (intermediate plutonic rock)

Bauxite (Laterite Clay)

Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))

Sandstone or Siltstone

Arenite (if sandstone)

Banded Sandstone

Arenite (with iron oxide banding)

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Amethyst Quartz

Silicon Dioxide (SiO2) with iron impurities

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Sandstone

Arenite (SiO2 primarily)

Quartz on Matrix

Silicon Dioxide (SiO2)

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Chert (often called Flint or River Rock)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Schist

Crystalline Metamorphic Rock (Schistose)

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Turquoise

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

Gneiss (Pebble)

Gneiss

Shale

Shale (clastic sedimentary rock)

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Sandstone (Banded)

Clastic sedimentary rock (primarily SiO2)

Quartz Geode (with Calcite influence)

Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Arenite

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Granitic Pegmatite

Granite (with coarse-grained Quartz, Feldspar, and Mica components)