Schäferite
| Schäferite | ||
|---|---|---|
| General | ||
| Category | Mohs scale hardness 5 | |
| Luster | Vitreous | |
| Streak | Yellow | |
| Diaphaneity | Transparent | |
| Optical properties | Isotropic | |
| Refractive index | n = 1.96 | |
| References | [2][3] | |
Schäferite is a rare vanadate mineral with chemical formula Ca2NaMg2[VO4]3. Schäferite is isometric, which means that it has three axes of equal length and 90° angles between the axes.[4] Schäferite is isotropic, meaning that the velocity of light is the same no matter which direction the light passes through.[3]
It was named after Helmut Schäfer (born 1931) who discovered it in a quarry on the
Eifel Mountains volcanic area near Mayen, Laacher See district of Germany.[2] It occurs within a xenolith in a leucite tephrite. It is the magnesium analogue of palenzonaite and is a member of the garnet structural group.[3]
References
- S2CID 235729616.
- ^ a b c Ralph, Jolyon and Ida Chau, 17 August 2010, "Schäferite." http://www.mindat.org/min-7279.html. Accessed 27 September 2010.
- ^ a b c Barthelmy, David, 1997-2010, “Schäferite Mineral Data.” http://www.webmineral.com/data/Schaferite.shtml. Accessed 27 September 2010.
- ^ Verlagsbuchhandlung, E.S. (1999) Schäferite, a new vanadium garnet. Neues Jahrbuch Fur Mineralogie,1, 123-134.
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