Organic (Paper And Cellulose)

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Amazonite

Potassium Feldspar (Microcline), K(AlSi3O8)

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Vesicular Basalt (Lava Rock)

Basalt with vesicular texture

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Common Green Opal

Hydrated amorphous silicon dioxide (SiO2·nH2O)

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Wishing Stone

Greenschist or Basalt with Quartz/Calcite Vein

Smoky Quartz

Silicon Dioxide (SiO2)

Red Jasper (Amygdaloidal Basalt with Agate)

Silicon dioxide (SiO2) in Basalt host

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Gold in Quartz

Hydrothermal Quartz with Native Gold (SiO2 with Au)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Coquina or Fossilized Shell Aggregate

Calcareous bioclastic sedimentary rock (CaCO3)

Cubic Zirconia

Zirconium dioxide (ZrO2)

Gneiss (Metamorphic Rock)

Gneiss

Yellow Quartzite

Quartzite (SiO2)

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Turquoise (likely Sleeping Beauty variety or treated Howlite imitation)

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

Sandstone (Ferruginous)

Arenite with Iron Oxides

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2 + tracing minerals

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

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Fossilized Coral (Petoskey Stone or similar Favosites)

Hexagonaria percarinata / Favosites (Silurian-Devonian Coral)

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Sandstone

Arenite (primarily SiO2)

Paraiba Tourmaline

Elbaite Tourmaline (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) - Copper-bearing

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

Fairy Stone (Staurolite)

Staurolite (Fe2+2Al9Si4O22(OH)2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Pebble)

Arenite (primarily SiO2)

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide (SiO2) with inclusions

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Banded Quartzite River Pebble

Metamorphosed Quartz-rich Sandstone (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Chert (or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Fluorite (Green)

Fluorite (Calcium Fluoride, CaF2)

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Quartz Geode (Cracked)

Quartz (Silicon Dioxide, SiO2)