Sedimentary Or Metamorphic Derived

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Galena

Lead Sulfide (PbS)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Gray variety)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Pyrite in Matrix

Iron Sulfide (FeS2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Raw Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Jasper (Cream/Yellow variety)

Jasper (Microcrystalline Quartz, SiO2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Graphite

Graphite (Chemical Formula: C)

Muscovite Schist

Muscovite (KAl2(AlSi3O10)(OH)2) in Schist

Mica Schist with Garnet

Garnetiferous Mica Schist

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Marble

Recrystallized Calcite (CaCO3)

Schist with Schorl (Black Tourmaline)

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

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, and chlorite)

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Gneiss (Granitic Gneiss)

Gneiss

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Gneiss (Banded Gneiss)

Gneiss

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler

Quartzite

Quartzite (chiefly SiO2)

White Marble

Recrystallized Calcite (CaCO3)