Armbrusterite
A valid IMA mineral species
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About Armbrusterite
Prof. Thomas Armbruster
Formula:
K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
Colour:
Dark reddish-brown
Lustre:
Vitreous
Hardness:
3½
Specific Gravity:
2.78
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.
Type Locality:
This page provides mineralogical data about Armbrusterite.
Unique Identifiers
Mindat ID:
28891
Long-form identifier:
mindat:1:1:28891:4
GUID
(UUID V4):
(UUID V4):
d77305bd-e155-4d74-a5cd-d7c5449208dc
IMA Classification of Armbrusterite
Approved
IMA Formula:
Na6K5Mn3+Mn2+14(Si9O22)4(OH)10 · 4H2O
Approval year:
2005
First published:
2007
Classification of Armbrusterite
9.EG.65
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Abr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Abr | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Armbrusterite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Dark reddish-brown
Comment:
Transparent in thin fragments.
Streak:
Light-brown
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
2.78(2) g/cm3 (Measured) 2.579 g/cm3 (Calculated)
Optical Data of Armbrusterite
Type:
Biaxial (-)
RI values:
nα = 1.532(2) nβ = 1.560(2) nγ = 1.564(2)
2V:
Measured: 10° to 20°, Calculated: 41°
Max Birefringence:
δ = 0.032
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v, weak.
Optical Extinction:
X is perpendicular to (001).
Pleochroism:
Strong
Comments:
X = light yellowish-brown; Y and Z = dark reddish-brown.
Chemistry of Armbrusterite
Mindat Formula:
K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
Crystallography of Armbrusterite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 17.333(2) Å, b = 23.539(3) Å, c = 13.4895(17) Å
β = 115.069(9)°
β = 115.069(9)°
Ratio:
a:b:c = 0.736 : 1 : 0.573
Unit Cell V:
4985.4 ų
Z:
2
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.28 Å | (100) |
| 4.10 Å | (10) |
| 3.562 Å | (10) |
| 3.260 Å | (18) |
| 3.117 Å | (13) |
| 3.077 Å | (54) |
| 2.622 Å | (10) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) |
Type Occurrence of Armbrusterite
General Appearance of Type Material:
Poorly shaped split and curved crystals (≤1 mm). Also clusters (≤8 mm diameter) of spherulites (≤2 mm diameter) consisting of platy crystals.
Place of Conservation of Type Material:
Geological and Mineralogical Museum of the Geological Institute of the Kola Science Centre, Russian Academy of Sciences, Apatity, Russia, number 6280 (HT).
Mineralogical museum of St. Petersburg State University, Russia, number 1/19174 (CT).
Mineralogical museum of St. Petersburg State University, Russia, number 1/19174 (CT).
Geological Setting of Type Material:
In a thin cancrinite-aegirine-microcline vein within urtite.
Associated Minerals at Type Locality:
Synonyms of Armbrusterite
Related Minerals - Strunz-mindat Grouping
| 9.EG.05 | Cymrite | BaAl2Si2(O,OH)8 · H2O |
| 9.EG.10 | Naujakasite | (Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26 |
| 9.EG.10 | Manganonaujakasite | Na6(Mn2+,Fe2+)Al4Si8O26 |
| 9.EG.15 | Dmisteinbergite | Ca(Al2Si2O8) |
| 9.EG.20 | Kampfite | Ba12(Si11Al5)O31(CO3)8Cl5 |
| 9.EG.25 | Strätlingite | Ca2Al2SiO7 · 8H2O |
| 9.EG.25 | Vertumnite | Ca4Al4Si4O6(OH)24 · 3H2O |
| 9.EG.30 | Eggletonite | (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O |
| 9.EG.30 | Ganophyllite | (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O |
| 9.EG.30 | Tamaite | (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O |
| 9.EG.35 | Coombsite | KMn2+13(Si,Al)18O42(OH)14 |
| 9.EG.35 | Zussmanite | K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14 |
| 9.EG.40 | Franklinphilite | (K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2O |
| 9.EG.40 | Lennilenapeite | K6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2O |
| 9.EG.40 | Parsettensite | (K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2O |
| 9.EG.40 | Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| 9.EG.40 | Chalcodite | K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27 |
| 9.EG.45 | Latiumite | (Ca,K)4(Si,Al)5O11(SO4,CO3) |
| 9.EG.45 | Tuscanite | KCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2O |
| 9.EG.45 | Levantite | KCa3Al2(SiO4)(Si2O7)(PO4) |
| 9.EG.50 | Jagoite | Pb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6 |
| 9.EG.55 | Wickenburgite | CaPb3Al2Si10O24(OH)6 |
| 9.EG.60 | Hyttsjöite | Pb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2O |
| 9.EG.70 | Britvinite | [Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)] |
| 9.EG.70 | Roymillerite | Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5 |
| 9.EG.75 | Bannisterite | (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O |
| 9.EG.75 | UM1989-30-SiO:AlBaCaFeHKMgMn | (Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O |
| 9.EG.75 | Kayupovaite | Na2Mn10[(Si14Al2)O38(OH)8] · 7H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Armbrusterite
mindat.org URL:
https://www.mindat.org/min-28891.html
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Please feel free to link to this page.
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References for Armbrusterite
Reference List:
Yakovenchuk, V. N., Krivovichev, S. V., Pakhomovsky, Y. A., Ivanyuk, G. Yu., Selivanova, E. A., Men'shikov, Y. P., Britvin, S. N. (2007) Armbrusterite, K5Na6Mn3+Mn2+14[Si9O22]4(OH)10·4H2O, a new Mn hydrous heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia. American Mineralogist, 92 (2) 416-423 doi:10.2138/am.2007.2200
Localities for Armbrusterite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Yakovenchuk et al. (2007) |
South Africa | |
| Moore et al. (2011) +2 other references |
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Kukisvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia