Igneous, Sedimentary, And Metamorphic

Clear Quartz

Silicon Dioxide (SiO2)

Rough Quartz (likely Rose or Smoky variant)

Silicon Dioxide (SiO2)

White Calcite

Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky or Clear fragment)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Gneiss

Metamorphic Gneiss

Quartz

Silicon Dioxide (SiO2)

Graphite

Graphite (Carbon, C)

Pyrite

Iron Sulfide (FeS2)

Gneiss

Granitic Gneiss

Granitic Gneiss

Gneiss (quartz-feldspar-mica complex)

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler

Gneiss (specifically Banded Gneiss)

Gneiss

Banded Gneiss

Gneiss

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Bloodstone (Heliotrope)

SiO2 (Cryptocrystalline Quartz / Chalcedony)

Gneiss

High-grade Metamorphic Gneiss

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Magnetite

Magnetite (Fe3O4)

Quartz pebble

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Quartz pebble with a conchoidal chip

Silicon dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Blue Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)