Not A Rock (Synthetic Material)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite with Iron Banding

Metamorphosed Quartz-rich Sandstone (SiO2 with Fe2O3 inclusions)

Labradorite

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

Pink Tumbled Agate (Dyed)

Silicon Dioxide (SiO2) with artificial dyes

Limonite (Iron Ore)

Limonite (Hydrated iron oxide - FeO(OH)·nH2O)

Breccia

Clastic Breccia (SiO2/CaCO3 dominated)

Limonite (Iron Ore)

Goethite and related iron hydroxides (FeO(OH)·nH2O)

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Amethyst Cluster

Amethyst (Silicon Dioxide), chemical formula: SiO2

Tree Agate

Dendritic Chalcedony (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

Moonstone

Orthoclase Feldspar (KAlSi3O8) or Albite mixtures

Amazonite

Amazonite (KAlSi3O8)

Amethyst

Amethyst (SiO2 with iron impurities)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Smoky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Pink Granite

Phaneritic intrusive felsic igneous rock

Jasper Pebble

Tumbled Jasper (Microcrystalline Quartz, SiO2)

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Limonite Concretion

Limonite (FeO(OH)·nH2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Serpentinite (Commonly known as Serpentine)

Antigorite, Lizardite, or Chrysotile [(Mg,Fe)3Si2O5(OH)4]

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

White Topaz

Topaz - Al2SiO4(F,OH)2

Blue Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Golden Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Amber

Fossilized Tree Resin (Amorphous Hydrocarbon)

Que Sera Stone (Llanite)

Rhyolite Porphyry with Blue Quartz and Feldspar

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Blue Tiger's Eye

Silicon Dioxide (SiO2) with Crocidolite inclusions

Labradorite

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