Sedimentary And Metamorphic Minerals

Chert (with Limonite staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Red Sandstone

Arenite (Fe2O3-rich)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Milky Quartz (Common Quartz/Crystalline Quartz)

Quartz (Silicon Dioxide, SiO2)

Mica Schist (Garnetiferous)

Garnet-Mica Schist

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

Chalcedony

Silicon dioxide (SiO2) - Microcrystalline quartz

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

Conglomerate

Conglomerate (Sedimentary rock)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Quartzite with Sandstone/Iron staining

Metamorphic Quartzite (SiO2)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Turquoise

Turquoise (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]

Turquoise

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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz Geode (with Agate banding)

Silicon Dioxide (SiO2)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Moqui Marble

Ironstone Concretion (Goethite/Hematite shell with Sandstone core)

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Banded Iron Formation (BIF)

Banded Iron Formation containing Hematite (Fe2O3) and Magnetite (Fe3O4)

Coral Fossil (Scleractinia)

Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)

Glauconitic Sandstone

Glauconitic Quartz Arenite

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)

Chert (varietal Flint)

Silicon Dioxide (SiO2)

River Pebble (Brecciated Chert/Siltstone)

Silicon Dioxide (SiO2) with mineral inclusions

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Ironstone (with Limonite/Goethite)

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Petrified Wood

Silicified Wood (SiO2)

Red Sandstone

Arenite with Hematite (Fe2O3) cement

Moqui Marble

Iron Oxide Concretion (Hematite/Goethite-cemented Sandstone)

Chert (Iron-stained)

Chert (Microcrystalline Quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (Quartz, Chalcedony, or Opal)

Ironstone Concretion (Moqui Marble)

Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)