Feldspar is the most abundant mineral on Earth's crust, followed by quartz. The two main subgroups of feldspar that are known to produce gem-quality materials include potassium feldspars and plagioclases. Among the most popular feldspar gemstones are moonstone, star moonstone, rainbow moonstone, orthoclase, amazonite, andesine-labradorite, labradorite, sunstone and star sunstone.
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