Armbrusterite Mineral Data (original) (raw)

General Armbrusterite Information

Help on Chemical Formula: Chemical Formula:

K5Na6Mn+++Mn++14[Si9O22]4(OH)10•4H2O

Help on Composition: Composition:

Molecular Weight = 3,806.38 gm

Potassium 5.17 % K 6.22 % K2O

Sodium 3.96 % Na 5.33 % Na2O

Calcium 0.19 % Ca 0.27 % CaO

Magnesium 0.11 % Mg 0.19 % MgO

Titanium 0.03 % Ti 0.04 % TiO2

Manganese 20.02 % Mn 23.97 % MnO / 2.09 % Mn2O3

Aluminum 0.02 % Al 0.04 % Al2O3

Zinc 0.15 % Zn 0.19 % ZnO

Iron 0.51 % Fe 0.66 % FeO

Silicon 26.56 % Si 56.83 % SiO2

Hydrogen 0.47 % H 4.16 % H2O

Oxygen 42.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

K5.03Na6.55Mn2+12.86Mn3+1.01Fe2+0.35Mg0.18Ca0.18Zn0.09Al0.03Ti0.02Si36O88(OH)10.1�3.75(H2O)

Help on Environment: Environment:

Modulated manganese phyllosilicate

Help on IMA Status: IMA Status:

Approved IMA 2005 (Dana # Added)

Help on Locality: Locality:

Mt. Kukisvumchorr, Kola Peninsula, Russia Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Thomas Armbruster (b. 1950; University of Berne) for his outstanding contribution to structural mineralogy and crystallography, especially to the study of Mn-rich minerals .

Help on Synonym: Synonym:

IMA2005-035

Armbrusterite Image

Click Here for Larger Armbrusterite Image in a New Browser Window Images:

Click Here for Larger Armbrusterite Image Armbrusterite Comments: SEM image of a spherulite of platy crystals of armbrusterite (2 mm diameter) on cancrinite and calcite. (AmMin, v92:416). Location: Khibiny massif, Kola Peninsula, Russia..Scale: Spherulite Size 2 mm. © American Mineralogist

Click Here for Larger Armbrusterite Image in a New Browser Window Images:

Click Here for Larger Armbrusterite Image Armbrusterite Comments: Translucent yellow-brown crystals of armbrusterite on small fragment of brown matrix. Location: Kirovskii Mine, Mt. Kukisvumchorr, Khibiny, Kola Peninsula, Russia.Scale: Specimen Size 5x3x2 mm. © John Betts - Fine Minerals

Armbrusterite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.7363:1:0.573

Help on Cell Dimensions: Cell Dimensions:

a = 17.3335, b = 23.539, c = 13.4895, Z = 2; beta = 115.069° V = 4,985.42 Den(Calc)= 2.54

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 12.28(1)(001 ), 3.077(0.54)(004 ), 3.26(0.18)(114 ),3.117(0.13)(203 ), 2.622(0.1)(371 ), 3.562(0.1)(113,261), 4.1(0.1)(003 ),

Click Here for Large Armbrusterite Structure Window Crystal Structure:

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Help on Above

| | Yakovenchuk V N , Krivovichev S K , Pakhomovsky Y A , Ivanyuk G Y , Selivanova E A , Men�shikov Y P , Britvin S N , American Mineralogist , 92 (2007) p.416-423, Armbrusterite, K5Na6Mn3+Mn2+14[Si9O22]4(OH)10*4H2O, a new Mn hydrous, heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia, Locality: Khibiny alkaline massif, Kola Peninsula, Russia | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Armbrusterite

Help on Cleavage: Cleavage:

{001} Perfect

Help on Color: Color:

Dark reddish brown.

Help on Density: Density:

2.78

Help on Diaphaneity: Diaphaneity:

Translucent to transparent

Help on Fracture: Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Help on Habit: Habit:

Platy - Sheet forms (e.g. micas).

Help on Habit: Habit:

Spherical - Spherical, rounded aggregates.

Help on Hardness: Hardness:

3.5 - Copper Penny

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

light brown

Optical Properties of Armbrusterite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2173,KPDmeas= 0.1986,KC= 0.2109
Ncalc = 1.54 - 1.59

Calculated Properties of Armbrusterite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.49 gm/cc
note: Specific Gravity of Armbrusterite =2.54 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PEArmbrusterite = 6.92 barns/electron
U=PEArmbrusterite x relectron= 17.26 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 73.24 (Gamma Ray American Petroleum Institute Units)
Concentration of Armbrusterite per GRapi unit = 1.37 (%)

Estimated Radioactivity from Armbrusterite - barely detectable

Armbrusterite Classification

Help on Dana Class: Dana Class:

74.01.03.02 (74)Phyllosilicate Modulated Layers

(74.01)with joined islands

(74.01.03)Dana Group

74.01.03.01 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O)(?) C 2/m 2/m

74.01.03.02 Armbrusterite! K5Na6MnMn14[Si9O22]4(OH)10•4H2O C 2/m 2/m

Help on Strunz Class: Strunz Class:

09.EG.65 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EG -Double nets with 6-membered and larger rings

09.EG.65 Armbrusterite! K5Na6MnMn14[Si9O22]4(OH)10•4H2O C 2/m 2/m

Other Armbrusterite Information

Help on References: References:

NAME( AmMin, 92:416) PHYS. PROP.(AmMin, 92:416) OPTIC PROP.(AmMin, 92:416)

Help on See Also: See Also:

Links to other databases for Armbrusterite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Armbrusterite here :
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Print or Cut-and-Paste your Armbrusterite Specimen Label here :

Armbrusterite

K5Na6Mn+++Mn++14[Si9O22]4(OH)10•4H2O
Dana No: 74.01.03.02 Strunz No: 09.EG.65
Locality:

Notes: