Metamorphic Mineral

Pyrite

Pyrite (FeS₂)

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Quartzite (with Metamorphic Foliation)

Quartzite (Recrystallized SiO2)

Gneiss (Metamorphic Cobble)

Gneiss (High-grade Regional Metamorphic Rock)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Rock Crystal Quartz

Quartz (SiO₂)

Quartz Geode/Cluster

Quartz (SiO2)

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Rose Quartz

Quartz (SiO2) with trace elements of titanium, iron, or manganese

Pyrite

Iron Pyrite (FeS2)

Serpentinite

Serpentinite (composed primarily of mineral group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Quartz

Silicon Dioxide (SiO₂)

Unakite

Epidotized Granite (composition: K-feldspar, Epidote, and Quartz)

Aquamarine

Aquamarine (Beryl variety) - Be3Al2(Si6O18)

Quartzite (clastic/metamorphic subtype)

Quartzite (primarily Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Calcite

Calcite (Mineral; CaCO₃)

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Tiger's Eye (Rough)

SiO2 (Silicon Dioxide / Pseudomorph of Quartz after Crocidolite)

Quartz / Quartzite Fragment

Silicon Dioxide (SiO2)

Citrine

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Banded Gneiss

Gneiss (pronounced "nice")

Prehnite with Epidote inclusions

Prehnite: Ca2Al(AlSi3O10)(OH)2; Epidote: Ca2(Al,Fe)3(SiO4)3(OH)

Labradorite (tumbled)

Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Hematite (beads)

Hematite (Fe₂O₃)

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

River Rock (likely Quartzite or Chert)

Quartzite (primarily SiO2)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2) matrix

Quartzite

Quartzite (primarily SiO2)

Muscovite Schist with Quartz

KAl2(AlSi3O10)(OH)2 in Schistose matrix

Quartz (Massive Quartz or Quartzite)

Silicon Dioxide (SiO2)

Soapstone (Talc-Schist)

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Mica Schist (with Muscovite)

Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)