Igneous And Metamorphic Derivative (Weathered)

Quartzite

Quartzite (SiO2)

Quartzite

Metamorphosed Sandstone (SiO2 - Silicon Dioxide)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Milky Quartz (Water-Worn Pebble)

Silicon Dioxide (SiO2)

Granite

Phaneritic Felsic Igneous Rock

Quartzite (Ferruginous)

Recrystallized Quartz (SiO2) with Iron Oxide inclusions

Quartzite

Quartzite (primarily SiO2)

Moonstone (Feldspar)

Orthoclase or Oligoclase (KAlSi3O8)

Garnet (Almandine/Pyrope series)

Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)

Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)

Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)

Quartzite (River Cobble)

Metamorphosed Quartz Sandstone (SiO2)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Limonitic Scoria (Vesicular Basalt with Iron Staining)

Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Magnetite Orthorthotropic Rock

Magnetite (Fe3O4)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Staurolite (Fairy Cross)

Staurolite (Fe2+2Al9Si4O23(OH))

Erythrite

Erythrite (Cobalt Bloom) - Co3(AsO4)2·8H2O

Granite

Granite (Phaneritic Igneous Rock)

Citrine Quartz

Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities

Basalt with Iron Oxidation

Mafic Igneous Basalt

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (chiefly SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Red Quartzite (River Stone)

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Yellow Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Quartzite River Rock

Quartzite (primarily SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon dioxide (SiO2)

Fossilized Brachiopod/Bivalve in Limestone

Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions