Peterandresenite
Peterandresenite is a very rare mineral,[3] the first known natural hexaniobate. Its chemical formula is Mn4Nb6O19•14H2O. Its structure contains a special type of octahedron: Lindqvist ion. Peterandresenite was found in a pegmatite of the Larvik complex in Norway.[2] It is somewhat similar to other unique niobium minerals, aspedamite and menezesite.[4][5]
| Peterandresenite | |
|---|---|
| General | |
| Category | Oxide, Hexaniobate |
| Formula (repeating unit) | Mn4Nb6O19•14H2O |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m |
| Unit cell | a = 15.33, b = 9.41, c = 11.28 [Å], β = 118.65° (approximated); Z = 2 |
| Identification | |
| Color | Orange |
| Crystal habit | crystals (equidimensional) |
| Cleavage | None |
| Fracture | Uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 2-2.5 |
| Luster | Vitreous or resinous |
| Streak | Pale orange |
| Diaphaneity | Transparent or translucent |
| Density | 3.05 (calc.), 3.10 (meas.) [g/cm3] |
| References | [1][2][3] |
Occurrence
Peterandresenite was discovered in AS Granit quarry, Tvedalen, Larvik, Vestfold, Norway.[2]
References
- Mineralienatlas
- Friis, H., Larsen, A.O., Kampf, A.R., Evans, R.J., Selbekk, R.S., and Sánchez, A.A., 2014. Peterandresenite, Mn4Nb6O19·14H2O, a new mineral containing the Lindqvist ion from a syenite pegmatite of the Larvik Plutonic Complex, southern Norway. European Journal of Mineralogy 26, 567-576
- "Peterandresenite: Peterandresenite mineral information and data". Mindat.org. Retrieved 2016-03-04.
- "Aspedamite: Aspedamite mineral information and data". Mindat.org. Retrieved 2016-03-08.
- "Menezesite: Menezesite mineral information and data". Mindat.org. Retrieved 2016-03-08.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.