Chemical Formula Plagioclase Feldspars: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar: KAlSi3O8
Color White, Colorless, Blue, Green, Yellow, Orange, Brown, Pink, Purple, Gray
Hardness 6 – 6.5
Crystal System Click here for information on the Crystallization of Feldspar Minerals.
Refractive Index 1.518 – 1.526
SG 2.56 – 2.62
Transparency Transparent to translucent
Double Refraction -.0005
Luster Pearly
Cleavage 2,1 – basal ; 2,1 – prismatic ; 3,1 – pinacoidal
Mineral Class Orthoclase, Oligoclase, and other members of the feldspar group

Moonstone is a fairly abundant and inexpensive gemstone. In addition to its mysterious glow effect, Moonstone often displays a cats eye effect, and the band of light may float upon movement of the stone. Asterism in the form of four-rayed stars also exist, but are less common.

Greater transparency in Moonstone is more desirable, and the more transparency it has, the more valuable it is. The color of the stone also has an impact on its value. Moonstones with a bluish color sheen are very much in demand and are more valuable then the other types. Care should be handled with Moonstone as it is sensitive to pressure and can easily crack or chip.


Moonstone is an affordable gemstone that is well known since ancient times. It is polished as cabochons and used as beads and pendants. In some societies it is sewn into garments as a charm. Moonstone, along with Pearl, is the birthstone of June.


Cat’s Eye Moonstone – Moonstone exhibiting chatoyancy.
Rainbow Moonstone – Moonstone with a blue sheen. May also refer to Labradorite.
Star Moonstone – Moonstone displaying asterism.Moonstone gemstones are not treated or enhanced.Important deposits of Moonstone exist in India, Sri Lanka, Myanmar (Burma), Australia, Madagascar, Tanzania, and Brazil.Moonstone has a distinct appearance and it is difficult to confuse with other gemstones. Reddish and brownish Moonstone can look similar to Carnelian but Carnelian lacks the color effect of Moonstone.
Morganite is the pink to purplish-pink variety of Beryl. Beryl is best known for its gem varieties Emerald and Aquamarine, but other gem forms such as Morganite are also used. Morganite was first identified in 1910, and was named the following year by George F. Kunz in honor of financier and banker J.P. (John Pierpont) Morgan. Morgan was an avid collector of gemstones.
Moonstone SOURCES

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