Feldspar
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Physical & Optical Properties
Mohs Hardness
Value & Market
Where to Buy Feldspar
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About Feldspar
Feldspar is the most abundant mineral group in Earth's crust, comprising approximately 60% of all crustal rocks, and encompasses the gem varieties moonstone, labradorite, sunstone, amazonite, and orthoclase. Feldspars form in nearly every rock type across the globe and are divided into two main series—alkali feldspars and plagioclase feldspars—based on their sodium, potassium, and calcium content. The gem feldspars exhibit some of the most spectacular optical phenomena in gemology, including adularescence, labradorescence, and aventurescence.