General Taramellite Information
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Chemical Formula: |
Ba4(Fe+++,Ti,Fe++,Mg)4(B2Si8O27)O2Clx (x=0 to 1) |
Composition: |
Molecular Weight = 1,525.66 gm |
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Barium 30.60 % Ba 34.17 % BaO |
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Magnesium 0.16 % Mg 0.26 % MgO |
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Titanium 1.88 % Ti 3.14 % TiO2 |
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Iron 11.71 % Fe 13.66 % FeO / 1.57 % Fe2O3 |
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Silicon 14.36 % Si 30.72 % SiO2 |
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Boron 1.56 % B 5.02 % B2O3 |
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Lead 8.15 % Pb 8.78 % PbO |
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Chlorine 1.16 % Cl 1.16 % Cl |
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- % Cl -0.26 % -O=Cl2 |
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Oxygen 30.41 % O |
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______ ______ |
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100.00 % 98.22 % = TOTAL OXIDE |
Empirical Formula: |
Ba3.4Pb0.6Fe2+2.9Ti0.6Fe3+0.3Mg0.1B2.2Si7.8O29Cl0.5 |
Environment: |
A contact-metamorphic mineral. |
IMA Status: |
Valid Species (Pre-IMA) 1908 |
Locality: |
Candoglia, in the Toce Valley, Piedmont, Italy Link to MinDat.org Location Data. |
Name Origin: |
Named for Torquato Taramelli (1845-1922), Italian geologist. |
Synonym: |
ICSD 100266 |
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PDF 17-479 |
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Taramellite Image |
Images:
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Taramellite Crystallography
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Axial Ratios: |
a:b:c =0.8704:1:0.5123 |
Cell Dimensions: |
a = 12.125, b = 13.929, c = 7.136, Z = 2; V = 1,205.19 Den(Calc)= 4.20 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmmn |
X Ray Diffraction: |
By Intensity(I/Io): 3.01(1), 2.584(0.55), 3.83(0.5), |
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]
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Physical Properties of Taramellite
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Cleavage: |
[010] Perfect |
Color: |
Reddish brown, Bronze purple, Brownish violet. |
Density: |
3.9 - 3.92, Average = 3.91 |
Diaphaniety: |
Translucent to subtranslucent |
Habit: |
Fibrous - Crystals made up of fibers. |
Hardness: |
5.5 - Knife Blade |
Luster: |
Vitreous - Resinous |
Streak: |
brown |
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Optical Properties of Taramellite
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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. |
Pleochroism (x): |
flesh red or pale pinkish. |
Pleochroism (y): |
flesh red or pale pinkish. |
Pleochroism (z): |
black or nearly opaque. |
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Calculated Properties of Taramellite
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Electron Density: |
relectron=3.84 gm/cc note: rTaramellite =4.20 gm/cc. |
Fermion Index |
Fermion Index = 0.08758 Boson Index = 0.91242 |
Photoelectric: |
PETaramellite = 275.56 barns/electron U=PETaramellite x relectron=1,058.84 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Taramellite is Not Radioactive |
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Taramellite Classification
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Dana Class: |
64.3.1.1 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups |
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(64.3)4-membered rings with [Si2O7] dimers |
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(64.3.1)Taramellite group |
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64.3.1.1 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m |
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64.3.1.2 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m |
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64.3.1.3 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m |
Strunz Class: |
VIII/E.08-30 VIII - Silicates |
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VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8- |
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VIII/E.08 - Joaquinite group, Baotite - Orthojoaquinite-(Ce) series |
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VIII/E.08-05 Verplanckite Ba2(Mn,Ti,Fe)2Si2O6(O,OH,Cl,F)2·3(H2O) P 6/mmm 6/m 2/m 2/m |
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VIII/E.08-10 Baotite Ba4(Ti,Nb)8Si4O28Cl I 41/a 4/m |
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VIII/E.08-15 Cerchiaraite! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m |
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VIII/E.08-20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m |
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VIII/E.08-30 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m |
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VIII/E.08-40 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m |
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VIII/E.08-50 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) C 2 2 |
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VIII/E.08-60 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) Pbcm or Pbc2 Ortho |
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VIII/E.08-70 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2·(H2O) Ccmm or Ccm2 Ortho |
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VIII/E.08-80 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O) C 2 2 |
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VIII/E.08-89 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)·H2O Ccmm 2/m 2/m 2/m |
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VIII/E.08-90 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)·(H2O) Ccmm or Ccm21 Ortho |
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Other Taramellite Information
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References: |
NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Taramellite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Taramellite Specimen Label here :
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Taramellite
Ba4(Fe+++,Ti,Fe++,Mg)4(B2Si8O27)O2Clx (x=0 to 1)
Dana No: 64.3.1.1 Strunz No: VIII/E.08-30
Locality:
Notes:
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