Feldspar is derived from German "Feld"- field and "Spath" - a rock that does not contain ore. There are two main subgroups that produce gems: the potassium feldspars and the plagioclases (a series from calcium to sodium feldspars).

Varieties/Types:

• Albite - Sodium-rich Feldspar.
• Andesine - A plagioclase feldspar with an Albite: Anorthite molar ratio ranging from 50:50 to 70:30.
• Anorthite - Calcium-rich Feldspar.
• Bytownite - A plagioclase Feldspar with an Albite: Anorthite molar ratio ranging from 10:90 to 30:70.
• Labradorite - A plagioclase Feldspar with an Albite: Anorthite molar ratio ranging from 30:70 to 50:50.
• Spectrolite - Trade name for a Labradorite from Finland that shows the spectral colours especially effectively.
• Microcline - A triclinic Potassium Feldspar.
• Amazonite - A green to blue-green variety of Microcline.
• Oligoclase - A plagioclase feldspar with an Albite: Anorthite molar ratio ranging from 90:10 to 70:30.
• Orthoclase - A monoclinic Potassium Feldspar.
• Adularia - A gemmy colourless variety of Orthoclase.
• Moonstone - A variety of Orthoclase that exhibits a strong blue adularescence.
• Sanidine - A triclinic Potassium Feldspar found in lavas.
• Sunstone - A Plagioclase Feldspar, which exhibits aventurescence when viewed from certain directions.

Feldspar is the name given to a group of silicate crystals that include Moonstone, Labradorite, Sunstone, Albite, Amazonite, and Orthoclase, among others. Because of the sheer variety of Feldspars, they are often associated with contending with life’s changes and, as such, are beneficial for those who have difficulty coping. Those who are often pessimistic can carry/wear a piece of Feldspar and be able to see things in a more positive light. Feldspars often increase self-esteem, which can often lead to opening us up to realize our goals.

Physically, Feldspar can alleviate skin disorders and improve muscle function. [4]