Peterandresenite

Peterandresenite
General
CategoryOxide, Hexaniobate
Formula
(repeating unit)		Mn4Nb6O19•14H2O
IMA symbolPan[1]
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 15.33, b = 9.41,
c = 11.28 [Å], β = 118.65° (approximated); Z = 2
Identification
ColorOrange
Crystal habitcrystals (equidimensional)
CleavageNone
FractureUneven
TenacityBrittle
Mohs scale hardness2-2.5
LusterVitreous or resinous
StreakPale orange
DiaphaneityTransparent or translucent
Density3.05 (calc.), 3.10 (meas.) [g/cm3]
References[2][3][4]

Peterandresenite is a very rare mineral,[4] 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.[3] It is somewhat similar to other unique niobium minerals, aspedamite and menezesite.[5][6]

Occurrence

Peterandresenite was discovered in AS Granit quarry, Tvedalen, Larvik, Vestfold, Norway.[3]

References

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


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