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Mendigite

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About MendigiteHide

Formula:
Mn2Mn2MnCa(Si3O9)2
Colour:
yellow to brown
Specific Gravity:
3.56 (Calculated)
Crystal System:
Triclinic
Name:
Named by N.V. Chukanov, S.M. Aksenov, R.K. Rastsvetaeva, K.V. Van, D.I. Belakovskiy, I.V. Pekov, V.V. Gurzhiy, W. Schüller, and B. Ternes in 2015 after the town of Mendig, near the type locality in Germany.
Isostructural with:
Closely related to bustamite.


Classification of MendigiteHide

Approved
Approval Year:
2014
First Published:
2015
9.00.

9 : SILICATES (Germanates)
0 :
0 :

Physical Properties of MendigiteHide

Colour:
yellow to brown
Comment:
dark brown or black if coated with Mn-oxides
Cleavage:
Perfect
on (001)
Density:
3.56 g/cm3 (Calculated)

Optical Data of MendigiteHide

Type:
Biaxial (-)
RI values:
nα = 1.722 nβ = 1.782(5) nγ = 1.796(5)
2V:
Measured: 50° (10)
Max Birefringence:
δ = 0.074
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of MendigiteHide

Formula:
Mn2Mn2MnCa(Si3O9)2

Crystallography of MendigiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 7.0993(4) Å, b = 7.6370(5) Å, c = 7.7037(4) Å
α = 79.58(1)°, β = 62.62(1)°, γ = 76.47(1)°
Ratio:
a:b:c = 0.93 : 1 : 1.009
Unit Cell V:
359.29 ų
Z:
1
Morphology:
Long-prismatic crystals showing {001} as dominant form, may forming clusters.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.72(32)
3.40(20)
3.199(25)
3.000(26)
2.885(100)
2.691(21)
2.397(21)
1.774(37)
Comments:
From Type Description.

Type Occurrence of MendigiteHide

General Appearance of Type Material:
Clusters of long-prismatic crystals (up to 0.1x0.2x2.5 mm in size) in cavities.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 4420/1
Geological Setting of Type Material:
Sandinite
Associated Minerals at Type Locality:

Synonyms of MendigiteHide

Related Minerals - Nickel-Strunz GroupingHide

9.00.Clino-ferri-holmquistite◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2Mon. 2/m : B2/m
9.00.Shkatulkalita
9.00.AlflarseniteNaCa2Be3Si4O13(OH) · 2H2OMon. 2 : P21
9.00.YegoroviteNa4[Si4O8(OH)4] · 7H2OMon. 2/m : P21/b
9.00.FerroericssoniteBaFe2+2 Fe3+(Si2O7)O(OH) Mon. 2/m : B2/m
9.00.Ferrisepiolite(Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m)
9.00.ZvyaginiteNaZnNb2Ti[Si2O7]20(OH,F)3(H2O)4 + (x < 1)Tric. 1 : P1
9.00.BurnettiteCaVAlSiO6Mon. 2/m : B2/b
9.00.20Rinkite-(Ce)(Ca3Ce)Na(NaCa)Ti(Si2O7)2(OF)F2Mon.

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 MendigiteHide

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., Van, K.V., Belakovskiy, D.I., Pekov, I.V., Gurzhiy, V.V., Schu¨ller W. and Ternes, B. (2014) Mendigite, IMA 2014- 007. CNMNC Newsletter No. 20, June 2014, page 556; Mineralogical Magazine: 78: 549-558.
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Van, K.V., Belakovskiy, D.I., Pekov, I.V., Gurzhiy, V.V., Schüller, W., Ternes, B. (2015): Mendigite, Mn2Mn2MnCa(Si3O9)2, a new mineral species from the Eifel volcanic region, Germany. Zapiski RMO: 144(2): 48-60.
Belakovskiy, D.I., Cámara, F., Gagne, O.C., Uvarova, Y. (2016) New mineral names. American Mineralogist: 101: 1709-1716.

Internet Links for MendigiteHide

Localities for MendigiteHide

ⓘ - 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.
Germany (TL)
 
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mendig
        • Niedermendig
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Van, K.V., Belakovskiy, D.I., Pekov, I.V., Gurzhiy, V.V., Schüller W. and Ternes, B. (2014) Mendigite, IMA 2014- 007. CNMNC Newsletter No. 20, June 2014, page 556; Mineralogical Magazine, 78, 549-558.; Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Van, K.V., Belakovskiy, D.I., Pekov, I.V., Gurzhiy, V.V., Schüller, W., Ternes, B. (2015): Mendigite, Mn2Mn2MnCa(Si3O9)2, a new mineral species from the Eifel volcanic region, Germany. Zapiski RMO, 144(2), 48-60
          • Wingertsberg
in the collection of Christof Schäfer
Mineral and/or Locality  
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