Peterandresenite

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 crytals (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]

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]

Occurrence

Peterandresenite was discovered in AS Granit quarry, Tvedalen, Larvik, Vestfold, Norway.[2]

References

  1. ↑ Mineralienatlas
  2. 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
  3. 1 2 "Peterandresenite: Peterandresenite mineral information and data". Mindat.org. Retrieved 2016-03-04.
  4. ↑ "Aspedamite: Aspedamite mineral information and data". Mindat.org. Retrieved 2016-03-08.
  5. ↑ "Menezesite: Menezesite mineral information and data". Mindat.org. Retrieved 2016-03-08.


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