Feldspar is a general term for feldspar minerals, a common class of aluminosilicate rock-forming minerals containing calcium, sodium and potassium. Feldspar in the crust as high as 60%, in igneous rocks, metamorphic rocks, sedimentary rocks can occur. Feldspar is a major mineral component of almost all igneous rocks. Feldspar common milky white, but often due to contain a variety of impurities and was dyed yellow, brown, light red, dark gray and other colors, and some may also have a beautiful color or faint halo. We usually divide feldspar into orthoclase (potassium feldspar) and plagioclase feldspar. The main difference between the two is that feldspar is equal to 90 degrees and plagioclase is less than 90 degrees.

Plagioclase is divided into albite, feldspar, feldspar, labradorite, feldspar, calcium feldspar, etc., are the same kind of mixture, from left to right, less and less sodium, calcium more and more. Moonstone is also called moonstone, and also known as plagioclase feldspar, plagioclase is albite (NaAlSi3O8, symbol Ab) and the calcium feldspar (CaAl2Si2O8, symbol An) consisting of isomorphous series, usually with An molecules of the hundred Sub-content to indicate the composition of plagioclase, labradorite plagioclase, An content -70%. Rainbow moonstone: from the front to see a small rainbow of orange, unlike the blue moonlight only blue light, the rainbow moonlight basic orange yellow green blue violet light can see, rainbow moonlight general cotton will be more than the blue moon Crystal through.

Cream Body Blue Moonlight: cream body blue moon crystal translucent whitening color, bluing.

Transparent blue Moonstone: There may be cotton crack crystal, but the overall is very transparent.

Labradorite: Labradorite background color is relatively deep, the same color and color moonlight is varied. There are some elongated strips of leftover stone, and inclusions in the crystal are no longer normal for the labradorite.

Gray moonstone: distinguish between elongated stone and gray moonlight only need to grasp two points: 1. gray moonlight luster is silver white, there is no other color light. 2. The crystal of moonlight may not penetrate perfectly, but on the basis of a gray base, there is no inclusions of the labradorite.

White Moonstone: white, crystal inclusions (may have cotton crack), white light, cat eyes often appear.

Orange moonstone: orange, crystal without inclusions.