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Möhnite

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About MöhniteHide

Gerhard Möhn
Formula:
(NH4)K2Na(SO4)2
Colour:
Light brown, brown
Lustre:
Vitreous, Resinous
Hardness:
3
Specific Gravity:
2.4
Crystal System:
Trigonal
Name:
Named by Nikita V. Chukanov, et al. in 2014 in honor of Gerhard Möhn (b. 1959), German pharmacist and amateur mineralogist. He has identified many minerals from Chilean and German localities that were later studied by professional mineralogists and is a coauthor of descriptions of at least six new species. He collected the first specimens of möhnite.
Ammonium analogue to aphthitalite. Found in a guano deposit.


Classification of MöhniteHide

Approved
Approval Year:
2015
First Published:
2015

Physical Properties of MöhniteHide

Vitreous, Resinous
Transparency:
Transparent
Colour:
Light brown, brown
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Density:
2.4 g/cm3 (Measured)     2.461 g/cm3 (Calculated)

Optical Data of MöhniteHide

Type:
Isotropic
RI values:
nω = 1.505() nε = 1.505(2)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of MöhniteHide

Formula:
(NH4)K2Na(SO4)2

Crystallography of MöhniteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3m1
Setting:
P3m1
Cell Parameters:
a = 5.7402(3) Å, c = 7.435(1) Å
Ratio:
a:c = 1 : 1.295
Unit Cell V:
212.16 ų
Z:
1
Morphology:
Aggregates and clusters of brown imperfect bipyramidal or spindle-shaped crystals.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.955(27)
4.122(37)
3.708(29)
2.969(74)
2.861(100)
2.474(20)
2.060(33)
1.433(11)
Comments:
From type description.

Type Occurrence of MöhniteHide

General Appearance of Type Material:
Random aggregates and clusters (to 1 mm), and crusts consisting of imperfect bipyramidal, spindle-shaped crystals.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4638/1
Geological Setting of Type Material:
Guano deposit
Associated Minerals at Type Locality:

Synonyms of MöhniteHide

Fluorescence of MöhniteHide

Non-fluorescent under the UV radiation.

Other InformationHide

Notes:
Dissolves in water but is stable in dry air.
Special Storage/
Display Requirements:
Store in a dry place.
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 MöhniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Pekov, I.V., Belakovskiy, D.I. Britvin, S.N. (2015) Möhnite, IMA 2014-101. CNMNC Newsletter No. 24, April 2015, page 251; Mineralogical Magazine: 79: 247-251.
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Pekov, I.V., Belakovskiy, D.I., Britvin, S.N. (2015) Möhnite, (NH4)K2Na(SO4)2, a new guano mineral from Pabellón de Pica, Chile. Mineralogy and Petrology: 109: 643-648.

Internet Links for MöhniteHide

Localities for MöhniteHide

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.
Chile (TL)
 
  • Tarapacá Region
    • Iquique Province
      • Chanabaya
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Pekov, I.V., Belakovskiy, D.I. and Britvin, S.N. (2015) Möhnite, IMA 2014-101. CNMNC Newsletter No. 24, April 2015, page 251; Mineralogical Magazine, 79, 247-251.; Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Pekov, I.V., Belakovskiy, D.I., Britvin, S.N. (2015): Möhnite, (NH4)K2Na(SO4)2, a new guano mineral from Pabellón de Pica, Chile. Mineralogy and Petrology, 109, 643-648.
Mineral and/or Locality  
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