Last updated
Category Mineral
(repeating unit)
Strunz classification 9.BC.05
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/m
Mohs scale hardness5-6
Luster vitreous
Streak gray
Specific gravity 3.3-3.8

Thortveitite is a rare mineral consisting of scandium yttrium silicate (Sc,Y)2Si2O7. It is the primary source of scandium. Occurrence is in granitic pegmatites. It was named after Olaus Thortveit, a Norwegian engineer. It is grayish-green, black or gray in color. [1] [2] [3] [4]

A transparent gem quality example was found in 2004, and reported in "The Journal of Gemmology". [5]

See also

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  1. "Thortveitite Mineral Data". Retrieved 2021-05-03.
  2. "Thortveitite". Retrieved 2021-05-03.
  3. Bianchi, Riccardo; Pilati, Tullio; Diella, Valeria; Gramaccioli, Carlo Maria; Mannucci, Gregorio (1988-06-01). "A re-examination of thortveitite". American Mineralogist. 73 (5–6): 601–607. ISSN   0003-004X.
  4. Mineralien aus aller Welt. Walter Schumann. München. 1990. ISBN   978-3-405-14003-8. OCLC   610708490.CS1 maint: others (link)
  5. Chapman, R., Mercer, I.F., Rankin, A.H., Spratt, J. (2008). "Thortveitite - a new gemstone" (PDF). Journal of Gemmology. 31: 1–6.CS1 maint: multiple names: authors list (link)