This form of quartz derives its distinctive milky white or cream color from inclusions
of gas and liquid bubbles. The degree milkiness depends on the number and size of inclusions present. Crystals are hexagonal prisms with pyramidal ends.
Occurrence
Very large crystals are found in Siberia. Other localities include Brazil, the European Alps. Madagascar, the USA, and Namibia.
Remarks
When polished orcuteri cabochon. It may be confused with opal.
Milky quartz 
