Classification of Middendorfite |
| IMA status: | Approved 2005 |
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| Strunz 8th edition ID: | 8/H.17-55
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| Nickel-Strunz 10th (pending) edition ID: | 9.EJ.10
9 : SILICATES (Germanates)
E : Phyllosilicates
J : Unclassified phyllosilicates |
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| mindat.org URL: | http://www.mindat.org/min-28996.html
Please feel free to link to this page. |
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Type Occurrence of Middendorfite |
| Type Locality: | Hilairitovoye pegmatite, Kirovskii apatite mine (Kirovsky Mine; Kirovskii Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia |
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| 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 |
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| Associated Minerals at type locality: | |
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Physical Properties of Middendorfite |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Transparent |
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| Colour: | Dark to bright orange |
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| Hardness (Mohs): | 3 - 3½ |
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| Cleavage: | Perfect
on (001) |
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| Density (measured): | 2.6 g/cm3 |
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Crystallography of Middendorfite |
| Crystal System: | Monoclinic |
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| Cell Parameters: | a = 12.55Å, b = 5.721Å, c = 26.86Å
β = 114.04° |
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| Ratio: | a:b:c = 2.194 : 1 : 4.695 |
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| Unit Cell Volume: | V 1761 ų |
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| Z: | 2 |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 12.28 | | (100) | | 2.840 | | (90) | | 2.634 | | (88) | | 2.366 | | (76) | | 1.669 | | (64) |
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Chemical Properties of Middendorfite |
| Formula: | |
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| All elements listed in formula: | H, K, Mn, Na, O, Si |
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| 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.-% |
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Relationship of Middendorfite to other Species |
Related Minerals - Nickel-Strunz Grouping):
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Other Names for Middendorfite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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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. |
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Internet Links for Middendorfite |
| Search Engines: |
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| External Links: | Look for Middendorfite on WebmineralLook for Middendorfite on Athena MineralogyLook for Middendorfite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure Database |
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| Jobs: | Mining & Geology Jobs |
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Localities for Middendorfite |
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