Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Quartzite (River Cobble)

SiO2 (Quartz-rich Metamorphic Rock)

Sandstone (Banded)

Clastic sedimentary rock (primarily SiO2)

Amygdaloidal Basalt

Basalt with secondary amygdule minerals (likely Epidote or Chlorite)

Cloud Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite

Indigo Gabbro (also known as Mystic Merlinite)

Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)

Yellow Quartzite or Yellow Jasper

Quartzite (primarily SiO2 with Iron oxide staining)

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2)

Vesicular Basalt (Lava Rock)

Aphanitic Mafic Igneous Rock

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Green Aventurine

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

Quartzite

Quartzite (SiO2)

Granite

Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron oxide inclusions)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Basalt with Amygdules

Amygdaloidal Basalt

Sandstone with Manganese Dendrites/Oxide coatings

Arenite with Pyrolusite and Romanechite (MnO2)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Fossilized Horn Coral

Order Rugosa (Rugose Coral)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rough Corundum (likely Sapphire/Zircon-bearing)

Aluminium Oxide (Al2O3)

Raw Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Rose Quartz

Silicon dioxide with traces of titanium, iron, or manganese (SiO2)

Ironstone Concretion (Moqui Marble variety)

Ferruginous Sandstone Concretion

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Quartz with Iron Oxide Monzonite or Sandstone contact

Quartz (SiO2) with Limonite/Hematite staining

Turquoise

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

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Serpentine (Lizardite)

Serpentine subgroup, Mg3Si2O5(OH)4

Iolite-bearing Gneiss (Cordierite)

Cordierite (Mg2Al4Si5O18) in Gneiss matrix

River Jasper (Chert/Chalcedony mix)

Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Ferruginous Sandstone (with possible Epidote/Chlorite coloring)

Sandstone (SiO2 dominated with Fe2O3 staining)

Lava Rock (Basalt)

Basalt (extrusive igneous rock)

Unakite

Epidotized Granite

Schist with Schorl (Black Tourmaline)

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)