Mineral (Man Made Glass)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with Calcite

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Blue glass-like gemstone specimen (likely dyed or synthetic quartz)

Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Quartz

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Quartz

Silicon Dioxide (SiO2)

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Tumbled quartz-rich stone, likely milky quartz

Quartz (SiO₂), possibly iron-stained milky quartz or quartzite

Quartz (Druzy)

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz (Raw Crystal)

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

SiO2 (Silicon Dioxide)

Black Obsidian

Obsidian (Volcanic Glass)

Black Obsidian

Volcanic Glass (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Pink / Ferruginous)

Silicon Dioxide (SiO2)

Yellow Quartz

Silicon Dioxide (SiO2)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Blue Apatite

Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Milky Quartz

Silicon Dioxide (SiO2)

Chalcedony (Common Opal or Agate variant)

Silicon Dioxide (SiO₂)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (SiO2 with Fe2O3)

Obsidian

Volcanic Glass (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)