Mineral And Glass

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining and Matrix

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (SiO2)

Black Obsidian

Volcanic Glass (SiO2)

Rose Quartz

Silicon Dioxide with trace inclusions (SiO2)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Green Aventurine in Host Rock

SiO2 (Quartz with Fuchsite inclusions)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass

Obsidian

Volcanic Glass (SiO2)

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper Shard / Chert

Silicon dioxide (SiO2)

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Milky Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Disulfide (FeS2)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Quartz / Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Fluorite

Calcium fluoride (CaF2)

Quartzite River Rock with Dendrites

Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions

Milky Quartz (with Chlorite/Mineral Inclusions)

Silicon Dioxide (SiO2)

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with trace aluminum and irradiation

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Obsidian

Obsidian (Volcanic Glass)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Lodolite (Garden Quartz)

Silicon Dioxide (SiO2) with inclusions (Chlorite, Hematite, etc.)

Rose Quartz

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

Quartz (Milky or Cloudy Quartz)

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silica - SiO2)