Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Shale creek bed

Shale (fine-grained clastic sedimentary rock)

Granite

Granite (Phaneritic intrusive igneous rock)

Quartz (Milky Quartz vein fragment)

Silicon Dioxide (SiO2)

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Quartzite (River Stone)

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Sandstone (Banded Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Amazonite

Amazonite / Microcline (KAlSi3O8)

Granite

Granite

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Serpentinite

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile, Mg3Si2O5(OH)4)

River Pebble (likely Quartzite or Chert)

Silicon Dioxide (SiO2) crystal conglomerate

White Jade (Nephrite)

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt with Quartz Vein

Mafic Igneous Rock (SiO2 filling)

Blue Quartz (specifically Dumortierite Quartz)

SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)

Quartzite

Quartzite (SiO2)

Common Opal

Hydrated silica (SiO2 " nH2O)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Chinese Writing Stone

Porphyritic Basalt or Porphyritic Andesite with Feldspar phenocrysts (SiO2-rich Silicates)

Quartzite (River Stone)

Quartzite (composed primarily of Silicon Dioxide, SiO2)

Chert / Flint Conglomerate

Silicified Sedimentary Breccia (primarily SiO2)

Quartz

Silicon Dioxide (SiO₂)

Moqui Marble (Ironstone Concretion)

Goethite/Hematite Concretion (Fe2O3 / FeO(OH))

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)

Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.

Quartz

Quartz (SiO₂)

Basalt with inclusion

Basalt (Aphanitic-Porphyritic texture)

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3