Taramellite Mineral Data

Taramellite Mineral Data
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General Taramellite Information

Help on Chemical Formula: Chemical Formula: Ba4(Fe+++,Ti,Fe++,Mg)4(B2Si8O27)O2Clx (x=0 to 1)
Help on Composition: Composition: Molecular Weight = 1,525.66 gm
   Barium     30.60 %  Ba   34.17 % BaO
   Magnesium   0.16 %  Mg    0.26 % MgO
   Titanium    1.88 %  Ti    3.14 % TiO2
   Iron       11.71 %  Fe   13.66 % FeO /  1.57 % Fe2O3
   Silicon    14.36 %  Si   30.72 % SiO2
   Boron       1.56 %  B     5.02 % B2O3
   Lead        8.15 %  Pb    8.78 % PbO
   Chlorine    1.16 %  Cl    1.16 % Cl
                -   %   Cl   -0.26 % -O=Cl2   
   Oxygen     30.41 %  O
             ______        ______ 
             100.00 %       98.22 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba3.4Pb0.6Fe2+2.9Ti0.6Fe3+0.3Mg0.1B2.2Si7.8O29Cl0.5
Help on Environment: Environment: A contact-metamorphic mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1908
Help on Locality: Locality: Candoglia, in the Toce Valley, Piedmont, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Torquato Taramelli (1845-1922), Italian geologist.
Help on Name Pronunciation: Name Pronunciation: Taramellite + Pronunciation Say TARAMELLITE
Help on Synonym: Synonym: ICSD 100266
  PDF 17-479
 

Taramellite Image

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

Comments: Dark brown crystalline taramellite.
Location: Candoglia, Domo d'Ossola, Val Toce, Piedmonte, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Taramellite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.8704:1:0.5123
Help on Cell Dimensions: Cell Dimensions: a = 12.125, b = 13.929, c = 7.136, Z = 2; V = 1,205.19 Den(Calc)= 4.20
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.01(1), 2.584(0.55), 3.83(0.5),
Click Here for Large Taramellite Structure Window Crystal Structure:

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Mazzi F , Rossi G , American Mineralogist , 65 (1980) p.123-128, The crystal structure of taramellite, Locality: Candoglia, Italy

View Additional jPOWD Structure files for Taramellite
[1]
 

Physical Properties of Taramellite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Reddish brown, Bronze purple, Brownish violet.
Help on Density: Density: 3.9 - 3.92, Average = 3.91
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: brown
 

Optical Properties of Taramellite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.142 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1884,KPDmeas= 0.2024,KC= 0.1773
Ncalc = 1.69 - 1.74
Help on Optical Data: Optical Data: Biaxial (+), a=1.77, b=1.774, g=1.83, bire=0.0600, 2V(Calc)=32, 2V(Meas)=77. Dispersion r > v distinct.
Help on Pleochroism (x): Pleochroism (x): flesh red or pale pinkish.
Help on Pleochroism (y): Pleochroism (y): flesh red or pale pinkish.
Help on Pleochroism (z): Pleochroism (z): black or nearly opaque.
 

Calculated Properties of Taramellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.84 gm/cc
note: Specific Gravity of Taramellite =4.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PETaramellite = 275.56 barns/electron
U=PETaramellite x rElectron Density=1,058.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Taramellite is Not Radioactive
 

Taramellite Classification
Help on Dana Class: Dana Class: 64.03.01.01 (64)Cyclosilicates
  (64.03)4-membered rings with [Si2O7] dimers
  (64.03.01)Taramellite group
 
64.03.01.01 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m
 
64.03.01.02 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m
 
64.03.01.03 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 09.CE.20 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),
 
09.CE.20 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m
 
09.CE.20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m
 
09.CE.20 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m
 

Other Taramellite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Taramellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Taramellite Specimen Label here :

Taramellite

Ba4(Fe+++,Ti,Fe++,Mg)4(B2Si8O27)O2Clx (x=0 to 1)
Dana No: 64.03.01.01 Strunz No: 09.CE.20
Locality:

 

Notes: