Man Made Glass

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Black Jasper

Jasper (Silicon Dioxide, SiO2)

Halite

Halite (Sodium Chloride, NaCl)

Quartzite

Quartzite (SiO2)

Red Quartzite

Metamorphic Quartzite (SiO2)

Pumice

Vesicular Rhyolite or Trachyte (High-silica volcanic glass)

Pumice

Pumice (Amorphous volcanic glass)

Sandstone

Sandstone (clastic sedimentary rock)

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Quartzite

Quartzite (primarily SiO2)

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate ((Mg, Fe)2SiO4)

Peridot

Olivine (Mg, Fe)2SiO4

Peridot

Olivine (Mg, Fe)₂SiO₄

River Pebble (Chert/Quartzite)

Microcrystalline Quartz (SiO2)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

River Cobble (Quartzite)

Meta-orthoquartzite

Quartz (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Druzy) on Matrix

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (primarily SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Quartzite river pebble

Quartzite (SiO2)

Milky Quartz

Quartz (SiO2)

Fluorite on Matrix

Calcium Fluoride (CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)