Mineral And Glass

Tektite (Indochinite)

Tektite (Terrestrial Impact Glass)

Milky Quartz

Silicon Dioxide (SiO2)

Weathered quartz-bearing rock fragment

Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Obsidian (likely black obsidian)

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Sandstone

Arenite (SiO2 based)

Muscovite

KAl2(AlSi3O10)(OH)2

Pink quartz (likely rose quartz)

Rose quartz; quartz, SiO₂

Amethyst geode

Quartz (SiO₂), purple variety amethyst; commonly in basalt-hosted geodes

Obsidian

Obsidian (Volcanic Glass)

Obsidian with Matrix

Volcanic Glass (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

Tumbled quartz (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Opalite

Synthetic Glass (Simulated Opal)

Obsidian

Volcanic Glass (SiO2)

Rose Quartz

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

Opalite

Synthetic glass (SiO2 + metal additions)

Small pink mineral fragment

Indeterminate; possibly rose quartz or feldspar

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂) colored mainly by iron-related defects

Likely polished black stone, possibly obsidian

Obsidian (volcanic glass; primarily SiO₂), tentative identification

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Obsidian

Volcanic Glass (Amorphous Silica, SiO2)

Black Obsidian

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

Milky quartz

Quartz (silicon dioxide, SiO₂)

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Tumbled green stone, likely serpentine or aventurine

Indeterminate; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or green quartzite/aventurine (SiO₂)

Clear Quartz

Silicon Dioxide (SiO2)

Polished yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), colored yellow by iron impurities; exact variety cannot be confirmed visually

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂), likely rose quartz; possibly lab-created or treated

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz or chalcedony