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About MiddendorfiteHide

K3Na2Mn5Si12(O,OH)36 · 2H2O
Dark to bright orange
3 - 3½
Specific Gravity:
Crystal System:
For A. F. von Middendorf (1815-1894), a German-Russian scientist who made the first mineralogical studies on the Khibiny massif.

Classification of MiddendorfiteHide

Approval Year:

9 : SILICATES (Germanates)
E : Phyllosilicates
J : Unclassified phyllosilicates

Physical Properties of MiddendorfiteHide

Dark to bright orange
3 - 3½ on Mohs scale
on (001)
2.6 g/cm3 (Measured)    

Chemical Properties of MiddendorfiteHide

K3Na2Mn5Si12(O,OH)36 · 2H2O

Crystallography of MiddendorfiteHide

Crystal System:
Cell Parameters:
a = 12.55 Å, b = 5.721 Å, c = 26.86 Å
β = 114.04°
a:b:c = 2.194 : 1 : 4.695
Unit Cell V:
1761 ų

X-Ray Powder DiffractionHide

Powder Diffraction Data:
12.28 (100)
2.840 (90)
2.634 (88)
2.366 (76)
1.669 (64)

Type Occurrence of MiddendorfiteHide

General Appearance of Type Material:
Coarse, rhomb-like lamellar and tabular crystals up to 0.1 x 0.2 x 0.4 mm in size, combined in worm- and fan-like aggregates up to 1 mm
Associated Minerals at Type Locality:

Synonyms of MiddendorfiteHide

Related Minerals - Nickel-Strunz GroupingHide


Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MiddendorfiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
I. V. Pekov, N. V. Chukanov, V. T. Dubinchuk & A. E. Zadov (2006): Middendorfite, K3Na2Mn5Si12(O,OH)36• 2H2O, a new mineral from Khibiny Massif, Kola Peninsula. Proceedings of the Russian Mineralogical Society, 135(3), 42–52.

Internet Links for MiddendorfiteHide

Localities for MiddendorfiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
  • Murmansk Oblast
    • Khibiny Massif
      • Kukisvumchorr Mt
        • Kirovskii apatite mine (Kirovsky Mine; Kirovskii Mine; Kirov Mine)
I. V. Pekov, N. V. Chukanov, V. T. Dubinchuk & A. E. Zadov (2006): Middendorfite, K3Na2Mn5Si12(O,OH)36• 2H2O, a new mineral from Khibiny Massif, Kola Peninsula. Proceedings of the Russian Mineralogical Society, 135(3), 42–52.
Mineral and/or Locality  
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