Mineral Description (Anthropogenic Material)

Diorite (Salt and Pepper Rock)

Phaneritic Plutonic Diorite (Plagioclase Feldspar + Amphibole/Biotite)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Spiny Oyster Shell

Spondylus (Calcium Carbonate, CaCO3)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Granite

Phaneritic Felsic Igneous Rock (Granite)

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Quartzite

Quartzite (Primary mineral: SiO2)

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Granodiorite

Granodiorite (Na,Ca)(Al,Si)4O8

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Quartzite River Cobble

Quartzite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Green Fluorite in Host Rock

Fluorite (Calcium Fluoride, CaF2)

Blue Calcite

Calcium Carbonate (CaCO3)

Cloudy Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Cinnabar in Quartz

Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)

Sodalite

Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2

Hematite

Iron(III) oxide (Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

Blue Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalk

Calcium Carbonate (CaCO3)

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Petrified Wood

Silicified Wood (primarily SiO2)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Chert Nodule

Microcrystalline Silica (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Sandstone

Arenite (SiO2 based)

Diamond

Natural Carbon (C)