Not A Natural Rock

Quartz Vein Rock

Quartz (Silicon Dioxide, SiO2)

Slickenside

Tectonic Fault Scarp Surface

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Onyx (Black Onyx)

Onyx (Silicon Dioxide, SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Rough Diamond

Native Carbon (C)

Granite

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Calcium magnesium iron silicate hydroxide)

Green Aventurine

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

Chert Nodule (with Flint core)

Sedimentary Cryptocrystalline Quartz (SiO2)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Serpentinite

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

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar)

Red Sandstone

Sandstone (principally Quartz with Iron Oxide coating)

Basalt with Vesicles

Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Yellow Quartz (Citrine or Quartzite Pebble)

Silicon Dioxide (SiO2)

Black Onyx

Onyx (Silicon Dioxide, SiO2)

Gold Nugget

Native Gold (Au)

Hematite

Iron(III) oxide (Fe2O3)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Milk Quartz (Tumbled Pebble)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Clear Quartz (Tumbled)

Quartz (Silicon Dioxide - SiO2)

Diamond

Carbon (C)

Yellow Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Hematite

Iron (III) Oxide (Fe2O3)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Dyed Blue Agate

Cryptocrystalline Quartz (SiO2)

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Hematite

Iron(III) oxide (Fe2O3)

Gold Nugget

Native Gold (Au)

Banded Quartzite River Pebble

Metamorphosed Quartz-rich Sandstone (SiO2)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2 with iron impurities)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Hematite

Iron(III) oxide (Fe2O3)