Organic (Non Geological)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Garnet (specifically Almandine or Pyrope)

Almandine (Fe3Al2Si3O12) or Pyrope (Mg3Al2Si3O12)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Mineral

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rose Quartz

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

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide - SiO2)

Ruby

Corundum (Al2O3 with Chromium impurities)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite

Granite (Felsic Plutonic Rock)

Milky Quartz (Tumbled)

Quartz (Silicon Dioxide, SiO2)

Basalt

Extrusive Mafic Igneous Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Jasper

Silicon Dioxide (SiO2)

sedimentary

Quartzite

Quartzite (primarily SiO2)

Pink Sapphire

Corundum (Al2O3 with Chromium/Titanium/Iron traces)

Dendritic Jasper (Bumblebee like Agate)

Silicon Dioxide with inclusions (SiO2)

sedimentary

Gold Nugget

Native Gold (Au)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Quartzite (with Metamorphic Foliation)

Quartzite (Recrystallized SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Blue Aventurine

Quartzite with Dumortierite inclusions (SiO2)