Man Made Glass

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Chert (Common Opal or Chalcedony)

Microcrystalline Quartz (SiO2)

Granite

Intrusive Phaneritic Felsic Igneous Rock

Basalt

Basalt

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartzite River Rock

Quartzite (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

River Stone (Quartzite/Chert mixture)

Microcrystalline Quartz (SiO2)

Clear Quartz Cluster

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

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

Rose Quartz

Rose Quartz (SiO2)

Rose Quartz Pebble

Silicon Dioxide (SiO2)

Rose Quartz

Quartz (Silicon Dioxide) - SiO2

Citrine Quartz / Yellow Quartz Pebbles

Silicon Dioxide (SiO2)

Pumice

Pumice (Vesicular volcanic glass)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Strawberry Quartz and Rose Quartz

Silicon Dioxide (SiO2) with inclusions

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Olivine (Peridotite)

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

Peridot

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

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz (or Quartzite)

Silicon Dioxide (SiO2)