Metamorphic Or Igneous Alteration

Fuchsite (Green Muscovite in Quartz)

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Jasper with Epidote (Unakite-related)

Epidotized Quartzite (composed of Quartz, Epidote, and Feldspar)

Quartzite

Quartzite (Primary mineral: SiO2)

River Quartzite (or Quartz Cobble)

Quartzite (primarily Silicon Dioxide - SiO2)

Quartzite (River Cobble)

Quartzite (primarily SiO2)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Blue Quartz (specifically Dumortierite Quartz)

SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)

Serpentine

Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Schist

Mica Schist

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Rhodochrosite in Quartz

Manganese Carbonate (MnCO3)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (Silicon Dioxide: SiO2)

Ferruginous Quartz

Iron-stained Quartz (SiO2 with Fe2O3 impurities)

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Prase Quartz on Feldspar

Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)

Green Aventurine

Silicon dioxide (SiO2) with inclusions of Fuchsite

Green Aventurine

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

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Agate

Chalcedony (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Blue Kyanite

Kyanite (Al2SiO5)

Pyrite

Iron Disulfide (FeS2)

Unakite

Epidotized Granite

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Schorl (Black Tourmaline)

NaFe3Al6(BO3)3Si6O18(OH)4 (Complex Borosilicate)

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Beryl (Emerald Variety)

Beryllium Aluminum Silicate (Be3Al2(SiO3)6)

Green Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Galena

Lead(II) sulfide (PbS)