Moonstone deposits occur in Armenia (majorly from Lake Sevan), Australia, the Austrian Alps, Mexico, Myanmar, Madagascar, Norway, Sri Lanka, Poland, India, and the United States.
The most famous Moonstone is of the Orthoclase Feldspar Mineral Adularia, named for an early mining site close to Mt. Adular in Switzerland, presently the town of St. Gotthard.
A strong solution of the Plagioclase Feldspar Oligoclase the Potassium Feldspar Orthoclase also creates Moonstone specimens – Chocolate Moonstone
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