Man Made Glass Mineral Simulant

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Moonstone (specifically White Moonstone or Girasol Quartz)

Potassium aluminum silicate (KAlSi3O8)

Quartzite with Dendritic Manganese Oxide Inclusions

Metamorphic Quartzite (SiO2 with Mn-oxides)

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Quartzite (Coldwater or Druzy Quartz over Quartzite)

SiO2 (Silicon Dioxide)

Obsidian

Volcanic Glass (Amorphous SiO2)

Black Obsidian cabochon

Volcanic Glass (SiO2 + impurities)

Obsidian

Obsidian (Amorphous volcanic glass)

Polished green aventurine (likely)

Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica

Milky Quartz

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Sandstone

Arenite (SiO2 primarily)

Yellow Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Raw quartz crystal

Quartz (silicon dioxide, SiO₂)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Unidentified Dark Mineral or Rock

Indeterminate (Likely Silicon Dioxide or Carbon-based)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz-rich rock fragment

Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Amethyst and Green Aventurine (Tumbled Gemstones set in a wand)

Quartz (SiO2) varieties - Amethyst and Aventurine

Quartz (Smoky/Rock Crystal)

Silicon Dioxide (SiO2)

Likely weathered quartz-rich stone

Probably quartz-bearing sandstone or milky quartz; exact identification requires testing

Quartz (Milky/Gold-stained)

Silicon Dioxide (SiO2)

Tumbled pale stone, likely milky quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Likely polished/tumbled quartz-rich specimen

Quartz, silicon dioxide (SiO₂), possibly an agate or chalcedony variety

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Milky quartz-rich rock

Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue

Quartz (Crystal Point/Fragment)

Silicon Dioxide (SiO2)

Rough Quartz (likely Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Obsidian

Volcanic Glass (predominantly SiO2)

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2