Mineralogy Database

Tamaite Mineral Data

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General Tamaite Information

Help on Chemical  Formula: Chemical Formula: (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112•21(H2O)
Help on Composition: Composition: Molecular Weight = 4,822.34 gm
   Potassium   0.69 %  K     0.83 % K2O
   Barium      1.85 %  Ba    2.07 % BaO
   Sodium      0.26 %  Na    0.35 % Na2O
   Calcium     1.37 %  Ca    1.92 % CaO
   Manganese  27.34 %  Mn   35.30 % MnO
   Aluminum    4.03 %  Al    7.61 % Al2O3
   Silicon    19.10 %  Si   40.87 % SiO2
   Hydrogen    1.23 %  H    10.96 % H2O
   Oxygen     44.13 %  O
             ______        ______ 
             100.00 %       99.92 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.65K0.85Ba0.65Na0.55Mn2+24Si32.8Al7.2O95.3(OH)16.7�21(H2O)
Help on Environment: Environment: Veinlets in weakly metamorphosed Mn ore deposit. Ca analog of Ganophyllite.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Shiromaru mine, Okutama, Tama district, about 60 km from Tokyo, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA1999-011

Tamaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6137:1:0.935
Help on Cell Dimensions: Cell Dimensions: a = 16.64, b = 27.11, c = 25.35, Z = 4; beta = 98.74° V = 11,302.86 Den(Calc)= 2.83
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.6(1), 2.69(0.9), 2.46(0.75),2.6(0.75), 2.84(0.75), 3.13(0.75), 3.46(0.5),

Physical Properties of Tamaite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Colorless, Pale yellowish brown.
Help on Density: Density: 2.85
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Tamaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2163,KPDmeas= 0.2147,KC= 0.2166
Ncalc = 1.61 - 1.62
Help on Optical Data: Optical Data: Biaxial (-), b=1.612

Calculated Properties of Tamaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Tamaite =2.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETamaite = 15.58 barns/electron
U=PETamaite x relectron= 43.28 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 9.77 (Gamma Ray American Petroleum Institute Units)
Concentration of Tamaite per GRapi unit = 10.23 (%)

Estimated Radioactivity from Tamaite - barely detectable


Tamaite Classification

Help on  Dana Class: Dana Class: (74)Phyllosilicate Modulated Layers
  (74.01)with joined islands
  (74.01.02)Ganophyllite group Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7•8-9(H2O) A2/a 2/m Eggletonite Na2Mn8[Si11AlO29](OH)7•11(H2O) Ia or I2/a Mono Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112•21(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.EG.30 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EG -Double nets with 6-membered and larger rings
09.EG.30 Eggletonite Na2Mn8[Si11AlO29](OH)7•11(H2O) Ia or I2/a Mono
09.EG.30 Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7•8-9(H2O) A2/a 2/m
09.EG.30 Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112•21(H2O) P 21/a 2/m

Other Tamaite Information

Help on References: References: NAME( AmMin, vol 86, p769) PHYS. PROP.(AmMin, vol 86, p769) OPTIC PROP.(AmMin, vol 86, p769)
Help on See Also: See Also: Links to other databases for Tamaite :
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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Dana No: Strunz No: 09.EG.30





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