Man Made Mineral Simulant (Glass)

Blue Quartzite

Quartzite (silicon dioxide, SiO2)

Corundum (Ruby Variety)

Corundum (Al2O3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)

Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Chert Pebble with Inclusion

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Granite Pebble

Granite (Phaneritic Igneous Rock)

Quartzite

Quartzite (primarily SiO2)

Granite

Granite (Phaneritic Acidic Igneous Rock)

Jasper (Milky/Cream Variety)

Silicon Dioxide (SiO2) - variety of Chalcedony

Green Aventurine

Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Obsidian

Volcanic Glass (Amorphous Silica)

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Epidote with Quartz and Feldspar

Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Red Sandstone (with possible iron oxide staining)

Sandstone (primarily Quartz with Hematite/Goethite cement)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

Potassium Feldspar

Orthoclase (KAlSi3O8)

Quartz (Chatoyant or Milky variety)

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Chert)

Chert (Cryptocrystalline Silica, SiO2)

Brown Chert

Cryptocrystalline Silica (SiO2)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Granitic Pegmatite with Muscovite Mica

Pegmatite (containing KAl2(AlSi3O10)(OH)2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Chalcedony (Grey/White Agate)

Silicon Dioxide (SiO₂)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)