Mineral (Man Enhanced)

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Serpentinite

Serpentinite (group of hydrous magnesium iron phyllosilicates)

Manganese Oxide Crust on Limestone

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

Quartzite River Rock

Quartzite (primarily SiO2)

Kimberlite with Diamond

Kimberlite (Porphyritic Peridotite)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Druzy Agate (Star-cut Geode Slice)

Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Chalcedony (River Stone)

Silicon Dioxide (SiO2)

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Chromium (Chrome)

Chromium (Cr)

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Dumortierite Quartz (Blue Quartz)

Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz (or Quartzite)

Silicon Dioxide (SiO2)

Chalcedony (River Stone)

Microcrystalline Quartz (SiO2)

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Shale

Shale (comprised mostly of clay minerals and quartz)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Red Sandstone

Arenite (Ferruginous Sandstone)

Geode (unopened)

Silica-filled Concretion (SiO2)

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)

Sandstone

Arenite (SiO2 principal)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartzite and Jasper Pebbles

Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)

Sandstone (Quartzose Sandstone)

Arenite

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag