Mineral (Biogenic)

Moss Agate

Chalcedony (SiO2) with inclusions of hornblende or chlorite

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Amethyst (Quartz Variety)

Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)

Sunstone

Oligoclase (a plagioclase feldspar variant), (Na,Ca)(Al,Si)4O8

Amethyst

Amethyst (Silicon Dioxide - SiO2 with Iron impurities)

Amethyst (Chevron or Banded variety)

Silicon Dioxide (SiO2) with iron impurities

Kyanite in Quartz

Al2SiO5 in SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst/Smoky Quartz Cluster

Silicon Dioxide (SiO2)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with inclusions

Sunstone

Orthoclase or Oligoclase Feldspar (Na,Ca)(Al,Si)4O8

Amethyst

Amethyst (Silicon Dioxide with Iron impurities), SiO2

Tree Agate

Silicon Dioxide (SiO2) with dendritic inclusions

Chrysocolla

Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Copper Ore with Malachite and Chrysocolla

Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Diamond

Natural Carbon (C)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Rough Dark Green Sapphire

Corundum (Al2O3)

Blue Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of asbestiform silicates)

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

Granite Cobble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Serpentinite

Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Lunar Meteorite (Feldspathic Breccia)

Achondrite, Lunar Meteorite (Feldspathic Breccia)

Granodiorite Pebble

Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

Fossilized Angel Wing Shell

Cyrtopleura costata

Granite

Granite (Felsic Plutonic Rock)

Granodiorite Pebble

Granodiorite

Green Aventurine

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

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Fossilized Megalodon Tooth Fragment

Otodus megalodon (Carcharocles megalodon fossil)

Amygdaloidal Rhyolite

Rhyolite (felsic volcanic rock) with amygdules

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Basalt (with possible quartz veinsing)

Basalt

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)