Mineral Like Biological Tissue

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

White Quartz (Milky Quartz Mushroom)

Silicon Dioxide (SiO2)

Quartz with Iron Oxide Inclusions

SiO2 with Fe2O3 impurities

Carnelian Agate

Silicon dioxide (SiO2) - Chalcedony variety

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron

Garnet (Almandine/Pyrope)

Silicate Mineral (Group: X3Y2(SiO4)3 where X=Mg, Fe, Mn and Y=Al, Fe, Cr)

Milky Quartz

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Flower Agate

Chalcedony (Silicon Dioxide, SiO2) with Opaque Spherulitic Inclusions

Pyrite

Iron Sulfide (FeS2)

Blue Kyanite

Kyanite (Al2SiO5)

Banded Agate

Agate (Cryptocrystalline variety of Silica, SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Green Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Peridot (Gem-quality Olivine)

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

Geode (Quartz chalcedony variety)

SiO2 (Silicon Dioxide)

Yellow Aventurine

Quartzite with inclusions (SiO2)

Chalcedony (Agate/Quartz variety)

Cryptocrystalline Quartz (SiO2)

Quartz (Crystal Fragment)

Quartz / Silicon Dioxide (SiO2)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Quartz Crystal (specifically a milky or semi-translucent single crystal point)

Silicon Dioxide (SiO2)

Rough Diamond

Diamond (pure Carbon, C)

Blue Sapphire

Corundum (Al2O3 with trace amounts of iron and titanium)

Sunstone (Orthoclase Feldspar variant)

Orthoclase (KAlSi3O8) with inclusions

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Jasper with Manganese Dendrites

Silicon Dioxide (SiO2) with Oxide Mineral Inclusions

Botryoidal Chalcedony (Agate/Chert Nodule)

Chalcedony (SiO2)

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Pyrite

Iron Sulfide (FeS2)

Precious Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Quartz

Silicon Dioxide (SiO2)

Halite

Halite (Sodium Chloride, NaCl)

Milky Quartz

Silicon Dioxide (SiO2)

Dragon Blood Jasper

Epidote with Pietersite or Red Jasper (Ca2Al2Fe3+[Si2O7][SiO4]O(OH))

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Pegmatite

Pegmatitic Granite

Slag

Metallurgical by-product