Man Made Mineral Simulant (Glass)

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

Quartz (possibly Citrine or Smoky Quartz variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

White Quartz with Black Tourmaline

Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

Calcite with Quartz coating

Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)

Quartz with Mafic Inclusions

Silicon Dioxide (SiO2) with host igneous matrix

Granite

Felsic intrusive igneous rock

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Granite Pebble (Salt and Pepper Granite)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)

Sandstone

Arenite (primarily composed of SiO2)

Sandstone (likely Conglomerate or Gritstone)

Arenite (SiO2 based)

Biotite Schist

Biotite Mica Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Chert (specifically Yellow/Tan Chert)

Silicon Dioxide (SiO2)

Chert (Yellow or Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Sandstone (likely Quartzose Sandstone with mineral staining)

Arenite (composed mainly of SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Pebble)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicate Mineral), SiO2 with Fe2O3 inclusions

Quartz (Pink/Orange Variety)

Silicon Dioxide (SiO2)

Silver Sheen Obsidian

Volcanic Glass (Amorphous Silicon Dioxide - SiO2 with impurities)

Carnelian

Chalcedony (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Granite (Weathered)

Phaneritic Felsic Igneous Rock

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Milky Quartz

Silicon Dioxide (SiO2)

Celestite (Celectine)

Strontium sulfate (SrSO4)

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Celestine (or Celestite)

Celestine (Strontium Sulfate, SrSO4)