Foitite

Foitite is a mineral in the tourmaline group,[2] it is a vacancy-dominant member of the group.[3] Foitite is in the 'vacancy' group, due to the absence of atoms in the X site.[2]

Foitite
General
CategoryMineral
IMA symbolFoi[1]
Crystal systemTrigonal
Identification
Mohs scale hardness7

According to the Czech Geological Society, foitite is rare.[4] However foitite is quite common among low-temperature tourmalines[5] and it might be more common than previously thought.[6]

The color of the mineral is dark indigo with purple tints to bluish-black.[3]

Name

The mineral was named in 1993 by D. J. MacDonald, Frank C. Hawthorne, and Joel D.Grice after Franklin F. Foit, Jr.[5]

Chemistry

It lacks alkalis like sodium.[7]

Occurrence

It occurs in quartz veins[8] and possibly occurs in granite pegmatites.[9]

Foitite has also been reported in Marquette County, Michigan.[6] Its type locality is California.[5]

It has been reported in Wales and it is predicted that a more widespread distribution of the mineral in Wales will be shown.[2]

References
  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. "Mineral Database - Mineralogy of Wales". National Museum Wales. Retrieved 2021-10-12.
  3. "Foitite gemstone information". www.gemdat.org. Retrieved 2021-10-28.
  4. Journal of Geosciences. Czech Geological Society. 2010. p. 17.
  5. "Foitite". www.mindat.org. Retrieved 2021-10-12.
  6. "Foitite" (PDF). The A. E. Seaman Mineral Museum. Retrieved 29 October 2021.
  7. "Wisconsin Geological & Natural History Survey » Foitite". wgnhs.wisc.edu. Retrieved 2021-10-14.
  8. "Tourmaline-Bearing Quartz Veins in the Baraboo Quartzite, Wisconsin: Occurrence and Significance of Foitite and "Oxy-Foitite"". CiteSeerX 10.1.1.615.277. {{cite journal}}: Cite journal requires |journal= (help)
  9. "Foitite" (PDF). Mineral Data Publishing. 2001. Retrieved 29 October 2021.
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