Man Made Mineral Simulant (Glass)

Chalcedony Geode Fragment (Botryoidal)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartzite and Jasper Pebbles

Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)

metamorphic

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions

Obsidian

Obsidian (Volcanic Glass)

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Quartz Crystal (Amethyst)

Silicon Dioxide (SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

SiO2 (Silicon Dioxide)

Clear Quartz

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (SiO2)

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Mineraloid / Anthropogenic

Slag

Ferrous slag (by-product of iron smelting)

Sheen Obsidian

Volcanic glass (SiO2 with inclusions)

Quartz Grain

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon dioxide (SiO2)

Obsidian

Volcanic Glass (SiO2 rich)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining and Matrix

Silicon Dioxide (SiO2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Chert / Flint

Silicon Dioxide (SiO2)

sedimentary

Snowflake Obsidian (Tumbled)

Obsidian with Cristobalite inclusions

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Igneous

Obsidian

Obsidian (Volcanic Glass) SiO2 (70% or more)

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite Pebble

Granite

Obsidian

Obsidian (Volcanic Glass)

Greasy Quartz (likely carved Milky Quartz or Aventurine)

Silicon Dioxide (SiO2)

Clear Quartz

SiO2 (Silicon Dioxide)

Quartz (Milky or Smoky variant)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Volcanic glass