Thortveitite
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.[2][3][4][5]
| Thortveitite | |
|---|---|
 Thortveitite | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | (Sc,Y)2Si2O7 |
| IMA symbol | Tvt[1] |
| Strunz classification | 9.BC.05 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m |
| Identification | |
| Mohs scale hardness | 5-6 |
| Luster | vitreous |
| Streak | gray |
| Specific gravity | 3.3-3.8 |
A transparent gem quality example was found in 2004, and reported in "The Journal of Gemmology".[6]
References
- 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.
- "Thortveitite Mineral Data". webmineral.com. Retrieved 2021-05-03.
- "Thortveitite". www.mindat.org. Retrieved 2021-05-03.
- 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.
- Mineralien aus aller Welt. Walter Schumann. München. 1990. ISBN 978-3-405-14003-8. OCLC 610708490.
{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link) - Chapman, R., Mercer, I.F., Rankin, A.H., Spratt, J. (2008). "Thortveitite - a new gemstone" (PDF). Journal of Gemmology. 31: 1–6. doi:10.15506/JoG.2008.31.1.1.
{{cite journal}}: CS1 maint: multiple names: authors list (link)
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