Man Made Mineral Simulant (Glass)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Citrine

Citrine (Silicon Dioxide, SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz in Matrix (Lepidolite or Quartzite)

Silicon Dioxide (SiO2) with host rock

Green Aventurine

Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Quartz with inclusions (likely Tourmaline or Biotite)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Possible tektite or iron-rich slag-like natural specimen

Uncertain; possibly natural glass (tektite) or magnetite-rich rock

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartz (Milky or Rough Quartz)

Silicon Dioxide (SiO2)

Polished mahogany obsidian (probable)

Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

River Quartzite Slik

Quartzite (SiO2)

Quartz with Epidote / Serpentine (Vein Quartz)

SiO2 (Quartz) with Ca2(Al,Fe)3(SiO4)3(OH) (Epidote)

Milky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky quartz with iron-stained matrix

Quartz (silicon dioxide, SiO₂)

Limonite-stained Quartz

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O) coatings

Tumbled chalcedony (likely blue-gray agate)

Cryptocrystalline quartz, SiO₂; chalcedony/agate variety

Blue Apatite

Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))

Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Quartz-bearing iron-rich rock, possibly quartzite or hydrothermal breccia

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; exact host rock is uncertain from the photograph

Sandstone

Arenite (SiO2 dominant)

Fluorite (likely Green Fluorite variant)

Calcium Fluoride (CaF2)

K-Feldspar (Potassium Feldspar / Pink Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Milky Quartz

Silicon Dioxide (SiO2)

Orthoclase Feldspar with Quartz

Orthoclase (KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)