Minerals

Petrified Wood

Silicified Wood (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3)

Olivine (Peridot)

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

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Rose Quartz

Silicon dioxide (SiO2)

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Turquoise

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

Smoky Quartz

Smoky Quartz (SiO2: Silicon Dioxide)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Granite (Weathered)

Granite (Felsic Plutonic Rock)

Green Quartzite

Quartzite (primarily SiO2 with trace impurities)

Fossilized Tabulate Coral (Honeycomb Coral)

Favosites (Order: Tabulata)

Coprolite

Fossilized feces (various taxa)

Chert (Jasper/Carnelian variety)

Microcrystalline Quartz (SiO2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Jasper

Silicon dioxide (SiO2)

Fossilized Coral (Petoskey Stone / Favosites)

Favosites (extinct genus of tabulate coral)

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Snowflake Obsidian

Volcanic glass with Spherulite inclusions (SiO2)

Quartz

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Freshwater Pearl

Aragonite / Biogenic Calcium Carbonate (CaCO3)

Green Moss Agate

Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)

Quartz with Iron Oxide Monzonite or Sandstone contact

Quartz (SiO2) with Limonite/Hematite staining

Talc (Soapstone variety)

Talc (Hydrated magnesium silicate) - Mg3Si4O10(OH)2

Geode (unopened)

Calcedony-lined Geode (SiO2)

Rose Quartz

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

Chert Nodules

Chert (Silicon Dioxide, SiO2)

Blue Dumortierite Quartz

AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (often called Flint)

Microcrystalline to cryptocrystalline quartz (SiO2)

Tiger's Eye (Tumbled Blue/Black-Golden variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)

Tiger's Eye

Silicon Dioxide (SiO2) with fibrous inclusions of Crocidolite

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Feldspar (Orthoclase)

Potassium Feldspar (KAlSi3O8)

Ironstone Concretion (Moqui Marble type)

Ironstone Concretion (Fe2O3 with SiO2 core)