Mineral (Native Element Alloy)

Smoky Quartz (Herkimer-style)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Basalt with Epidote (Flowerstone-like texture)

Amygdaloidal Basalt (silicate mineral inclusions)

Rock Fragment with Calcite/Quartz Vein

Polymictic Rock Fragment (SiO2 / CaCO3)

Raw quartz crystal

Quartz (silicon dioxide, SiO₂)

Quartz-veined Metamorphic Rock

Quartz-veined Schist or Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Bauxite

Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Blue Quartzite

Metamorphic Rock (rich in Quartz, SiO2 with inclusions of Dumortierite or Magnesio-riebeckite)

Quartz pebble

Silicon dioxide (SiO2)

Quartz and Iron Oxide

Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions

Quartz (Field Stone)

Silicon Dioxide (SiO2)

Malachite

Copper(II) carbonate hydroxide [Cu2CO3(OH)2]

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Crystalline Silica (SiO2)

Quartz (Gravel Fragment)

Silicon Dioxide (SiO2)

Serpentine

Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)

Quartz Pebble

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Quartz (Milky/Tan)

Silicon Dioxide (SiO2)

Olivine-bearing Basalt / Scoria

Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert

Chert (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz Cobble (River Rock)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky or Cloudy variety)

Quartz (Silicon Dioxide, SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Banded gneiss

Gneiss, chiefly quartz–feldspar–mica (variable composition)

Pyrite

Iron Sulfide (FeS2)