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Middendorfite

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Formula:
K3Na2Mn5Si12(O,OH)36 · 2H2O
System:
Monoclinic
Colour:
Dark to bright orange
Hardness:
3 - 3½
Name:
For A. F. von Middendorf (1815-1894), a German-Russian scientist who made the first mineralogical studies on the Khibiny massif.
Related to Bannisterite, Parsettensite and the Stilpnomelane Group

Classification of Middendorfite

Approved 2005
9.EJ.10

9 : SILICATES (Germanates)
E : Phyllosilicates
J : Unclassified phyllosilicates
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Type Occurrence of Middendorfite

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

Physical Properties of Middendorfite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Dark to bright orange
Hardness (Mohs):
3 - 3½
Cleavage:
Perfect
on (001)
Density:
2.6 g/cm3 (Measured)    

Crystallography of Middendorfite

Crystal System:
Monoclinic
Cell Parameters:
a = 12.55Å, b = 5.721Å, c = 26.86Å
β = 114.04°
Ratio:
a:b:c = 2.194 : 1 : 4.695
Unit Cell Volume:
V 1761 ų
Z:
2
X-Ray Powder Diffraction Data:
d-spacingIntensity
12.28 (100)
2.840 (90)
2.634 (88)
2.366 (76)
1.669 (64)

Chemical Properties of Middendorfite

Formula:
K3Na2Mn5Si12(O,OH)36 · 2H2O
All elements listed in formula:
Analytical Data:
Results from electron probe microanalysis
SiO2 (50.87)
TiO2 (0.17)
Al2O3 (0.20)
ZnO (0.15)
FeO (0.68)
MnO (24.88)
MgO (0.18)
CaO (0.11)
Na2O (4.55)
K2O (10.16)
F (0.23)
H2O (7.73)

less O = F (0.10)

sum 99.81 wt.-%

Relationship of Middendorfite to other Species

9.EJ.05Lourenswalsite(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12

Other Names for Middendorfite

Name in Other Languages:

Other Information

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 Middendorfite

Reference List:
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 Middendorfite

Localities for Middendorfite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia (TL)
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • 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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