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Moonstone, Orthoclase Feldspar Gemstone Information
Information * Loose gemstones * Jewelry links

Moonstone is used as a birthstone for the month of June. According to Hindu legend, moonstone was formed from moonbeams. It was once believed if you hold one in your mouth during a full moon you can see your future. In India, moonstone is known as a sacred stone and is believed to bring good fortune. It is a highly prized gift for lovers as it arouses tender passion.
 

ENHANCEMENT CODE N
Click to view AGTA code.

PROPERTIES
Refractive Index 1.518-1.526
Hardness = 6-6.5 (Moh's Scale)
Specific Gravity =2.58
Species - Orthoclase Feldspar
Optic Character - Double Refraction.
Phenomena - Adularescence, Asterism, Chatoyancy

WARNINGS FOR CARE

Ultrasonic: Never
Steamer: Never
Heat: Poor
Chemicals that harm: Hydrofluoric acid

 
Crystal Structure

Moonstone crystal image.
Crystal system: Triclinic, prismatic.

MAJOR SOURCES
Sri Lanka, India, Australia, Brazil, Madagascar, Tanzania, US, Myanmar
Birthstones
 January  Garnet
February Amethyst
March Aquamarine
April Diamond
May Emerald
June Pearl/Alexandrite
July Ruby
August Peridot
September Sapphire
October Opal/Tourmaline
November Topaz or Citrine
December Blue Topaz or Zircon
Cabochon is the popular cut used in jewelry for moonstone.
Cabochons are smooth polished surfaces not faceted.
Common Cut Examples.

moonstone cabochon image.
Oval shape
Oval shape is the only shape available at this time.
 
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