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Armbrusterite

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About ArmbrusteriteHide

Prof. Thomas Armbruster
Formula:
K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
Colour:
dark reddish-brown
Lustre:
Vitreous
Hardness:
Crystal System:
Monoclinic
Name:
The mineral is named in honor of Prof. Thomas Armbruster (b. 1950; University of Berne) for his outstanding contribution to structural mineralogy and crystallography, especially to the study of Mn-rich minerals.
This page provides mineralogical data about Armbrusterite.


Classification of ArmbrusteriteHide

Approved
Approval Year:
2005
9.EG.65

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings

Physical Properties of ArmbrusteriteHide

Vitreous
Transparency:
Translucent
Colour:
dark reddish-brown
Streak:
light-brown
Hardness:
3½ on Mohs scale
Fracture:
Irregular/Uneven

Optical Data of ArmbrusteriteHide

Type:
Biaxial (-)
RI values:
nα = 1.532 nβ = 1.560 nγ = 1.564
2V:
Measured: 10° to 20°
Max Birefringence:
δ = 0.032
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of ArmbrusteriteHide

Formula:
K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
IMA Formula:
Na6K5Mn3+Mn2+14(Si9O22)4(OH)10 · 4H2O

Crystallography of ArmbrusteriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 17.3335 Å, b = 23.539 Å, c = 13.4895 Å
β = 115.069°
Ratio:
a:b:c = 0.736 : 1 : 0.573
Unit Cell V:
4985.4 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
12.28 (100)
4.10 (10)
3.562 (10)
3.260 (18)
3.117 (13)
3.077 (54)
2.622 (10)

Type Occurrence of ArmbrusteriteHide

General Appearance of Type Material:
Occurs as split, curved crystals and spherulites(~2mm diameter)
Associated Minerals at Type Locality:

Synonyms of ArmbrusteriteHide

Related Minerals - Nickel-Strunz GroupingHide

9.EG.05CymriteBaAl2Si2(O,OH)8 · H2OMon.
9.EG.10Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26Mon. 2/m : B2/m
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26Mon.
9.EG.15DmisteinbergiteCa(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5Mon. m
9.EG.25SträtlingiteCa2Al2SiO7 · 8H2OTrig.
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon.
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2OMon.
9.EG.35CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14Trig.
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
9.EG.40Franklinphilite(K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2OTric.
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2OTric.
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2OMon. 2/m : B2/m
9.EG.40Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2OTric. 1 : P1
9.EG.45Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)Mon.
9.EG.45Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2OMon.
9.EG.50JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex.
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
9.EG.60HyttsjöitePb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2OTrig.
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]Tric. 1 : P1
9.EG.75Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b

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 ArmbrusteriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Victor N. Yakovenchuk, Sergey V. Krivovichev, Yakov A. Pakhomovsky, Gregory Yu. Ivanyuk, Ekaterina A. Selivanova, Yury P. Men'shikov, and Sergey N. Britvin (2007): Armbrusterite, K5Na6Mn3+Mn2+14[Si9O22]4(OH)10•4H2O, a new Mn hydrous heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia. Am. Mineral. 92, 416-423.

Internet Links for ArmbrusteriteHide

Localities for ArmbrusteriteHide

ⓘ - 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)
 
  • Murmansk Oblast
    • Khibiny Massif
Victor N. Yakovenchuk, Sergey V. Krivovichev, Yakov A. Pakhomovsky, Gregory Yu. Ivanyuk, Ekaterina A. Selivanova, Yury P. Men'shikov, and Sergey N. Britvin (2007): Armbrusterite, K5Na6Mn3+Mn2+14[Si9O22]4(OH)10•4H2O, a new Mn hydrous heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia. Am. Mineral. 92, 416-423.
South Africa
 
  • Northern Cape Province
    • Postmasburg manganese field
      • Kathu
        • Sishen
John M. Moore, Barbara K. Kuhn, Darren F. Mark, and Harilaos Tsikos (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. Eur. J. Mineral. 23, 661-673.
Moore, J.M., Kuhn, B., Mark, D.F., Tsikos, H. (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. European Journal of Mineralogy: 23: 661-673; http://forum.amiminerals.it/viewtopic.php?f=5&t=7909 (2016)
Mineral and/or Locality  
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