Mineral, Often Found As A Rock (Metamorphic)

Quartzite

Quartzite (primarily SiO2)

Jasper with Epidote Vein

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3

Quartz

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Matrix

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Smoky Quartz

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Slate with Pyrite Inclusions

Foliated Metamorphic Rock (with Iron Sulfide FE-S2)

Arsenopyrite

Arsenopyrite (FeAsS)

Iolite (Cordierite)

Cordierite (Magnesium iron aluminum cyclosilicate), Mg2Al4Si5O18

Quartzite

Quartzite (SiO2)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Quartzite

Quartzite (primarily SiO2)

Rhodonite

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

Rhodonite

Manganese Inosilicate (MnSiO3)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Serpentinite

Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

Tiger's Eye (Inlaid in a band)

SiO2 (Silicon Dioxide with Crocidolite inclusions)

Quartzite (Beach Pebble)

Quartzite (Composition: SiO2)

Quartzite

Quartzite (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Granitic Pegmatite

Pegmatitic Granite

Almandine Garnet

Almandine (Fe3Al2Si3O12)

Pyrite

Iron Disulfide (FeS2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Slate

Slate (Foliated metamorphic rock)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Quartzite

Quartzite (primarily SiO2)

Yellow Quartzite (Iron-stained)

Quartzite (primarily SiO2 with Fe2O3 staining)

Pink Quartzite

Quartzite (SiO2)

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Sapphire (Corundum)

Corundum (Al2O3)

Aventurine (likely Green Aventurine)

Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)

Rhodonite

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