Sedimentary Or Metamorphic Derived

Banded Gneiss

Gneiss

Marble

Recrystallized Calcite / Dolomite (CaCO3)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz

Quartz (SiO2)

Metamorphic or Sedimentary depending on local grade

Mica-rich Sandstone or Micaceous Schist Weathering

Micaceous Schist (Muscovite-Quartz composition)

Chalk

Calcareous Ooze (composed primarily of coccoliths)

Sedimentary Rock

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Hematite (Iron Ore)

Hematite (Fe2O3)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Honey Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz (Milk/Citrine variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz in Matrix

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Blue Calcite

Calcite (CaCO3)

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Graphite

Graphite (Native Carbon, C)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

sedimentary

White Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Mineraloid

Geode (Quartz chalcedony variety)

SiO2 (Silicon Dioxide)

sedimentary

Fluorite

Fluorite (Calcium Fluoride, CaF2)