foitite

Also known as IMA1992-034, Foi

Foitite is a mineral in the tourmaline group, it is a vacancy-dominant member of the group. Foitite is in the 'vacancy' group, due to the absence of atoms in the X site.

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Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 9.CK.05
Nickel-Strunz 9th edition (updated 2009): 9.CK.05
IMA Mineral Symbol: Foi
Commons category: Foitite
chemical formula: (☐,Na)(Fe²⁺₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃OH

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Foitite is a mineral in the tourmaline group, it is a vacancy-dominant member of the group. Foitite is in the 'vacancy' group, due to the absence of atoms in the X site.

According to the Czech Geological Society, foitite is rare. However foitite is quite common among low-temperature tourmalines and it might be more common than previously thought.