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Middendorfite

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About MiddendorfiteHide

Formula:
K3Na2Mn5Si12(O,OH)36 · 2H2O
Colour:
Dark to bright orange
Lustre:
Vitreous
Hardness:
3 - 3½
Specific Gravity:
2.6
Crystal System:
Monoclinic
Name:
For A. F. von Middendorf (1815-1894), a German-Russian scientist who made the first mineralogical studies on the Khibiny massif.

Classification of MiddendorfiteHide

Approved
Approval Year:
2005
9.EJ.10

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

Physical Properties of MiddendorfiteHide

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

Chemical Properties of MiddendorfiteHide

Formula:
K3Na2Mn5Si12(O,OH)36 · 2H2O

Crystallography of MiddendorfiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 12.55 Å, b = 5.721 Å, c = 26.86 Å
β = 114.04°
Ratio:
a:b:c = 2.194 : 1 : 4.695
Unit Cell V:
1761 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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

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

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

ⓘ - 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)
 
  • Murmanskaya 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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