Feldspar gemstones are composed of gem-grade feldspar, which is a common mineral in the Earth’s crust. Its chemical composition is K, Na, Ca and Ae silicate. Feldspar is a large mineral group with many varieties. The main sub-groups are K-feldspar, plagioclase feldspar and barium feldspar, whereas K-feldspar and plagioclase feldspar are used as gemstones. Common feldspar gems include moonstone (belomorite), adularia, sanidinite, amazonite and sunstone (sandastras) (Fig. 2).
Amazonite crystal
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(2020). Feldspar Gem. In: Chen, A., Ng, Y., Zhang, E., Tian, M. (eds) Dictionary of Geotourism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2538-0_693
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