Peterandresenite
| Peterandresenite | |
|---|---|
| General | |
| Category | Oxide, Hexaniobate |
| Formula (repeating unit) | Mn4Nb6O19•14H2O |
| Crystal system | Monoclinic |
| Unit cell | a=15.33, b=9.41, c=11.28, β=118.65o [Å] (approximated) |
| Identification | |
| Color | Orange |
| Crystal habit | crytals (equidimensional) |
| Crystal symmetry |
Monoclinic - Prismatic (point group 2/m); Space group: C2/m |
| 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] |
Peterandresenite is a very rare mineral,[2] 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.[1] It is somewhat similar to other unique niobium minerals, aspedamite and menezesite.[3][4]
Occurrence
Peterandresenite was discovered in AS Granit quarry, Tvedalen, Larvik, Vestfold, Norway.[1]
References
- 1 2 3 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
- 1 2 "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.
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