Titantaramellite Mineral Data

Titantaramellite Mineral Data +

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General Titantaramellite Information

Chemical Formula:

Ba4(Ti,Fe+++,Fe++,Mg)4(B2Si8O27)O2Clx X=0 TO 1, with Ti > Fe

Composition:

Molecular Weight = 1,442.84 gm

Barium 37.12 % Ba 41.44 % BaO

Magnesium 0.34 % Mg 0.56 % MgO

Titanium 6.31 % Ti 10.52 % TiO₂

Iron 5.42 % Fe 4.98 % FeO / 2.21 % Fe₂O₃

Silicon 15.57 % Si 33.31 % SiO₂

Boron 1.12 % B 3.62 % B₂O₃

Chlorine 1.97 % Cl 1.97 % Cl

- % Cl -0.44 % -O=Cl₂

Oxygen 32.16 % O

______ ______

100.00 % 98.17 % = TOTAL OXIDE

Empirical Formula:

Ba_3.9Ti_1.9Fe²⁺Fe³⁺_0.4Mg_0.2B_1.5Si₈O₂₉Cl_0.8

Environment:

Ba silicates near the contact with large granitic bodies. Changes to fresnoite at 960 deg C.

IMA Status:

Approved IMA 1984

Locality:

Rush Creek, Fresno County, California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for taramellite and dominance of Ti as the octahedral cation.

Synonym:

ICSD 100266

PDF 17-479

Titantaramellite Image

Images:

Titantaramellite

Comments: Dark brownish black titantaramellite crystal in quartz.
Location: Rush Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Titantaramellite Crystallography

Axial Ratios:

a:b:c =0.8697:1:0.5112

Cell Dimensions:

a = 12.137, b = 13.955, c = 7.134, Z = 2; V = 1,208.30 Den(Calc)= 3.97

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/I_o): 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: Rush Creek, Fresno County, California, USA

Physical Properties of Titantaramellite

Cleavage:

[100] Perfect

Color:

Bronze brown, Purple red.

Density:

4 - 4.08, Average = 4.04

Diaphaniety:

Translucent to opaque

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5-6 - Knife Blade-Orthoclase

Optical Properties of Titantaramellite

Optical Data:

Biaxial (+), a=1.739-1.753, b=1.749-1.761, g=1.77-1.782, bire=0.0290-0.0310, 2V(Calc)=64-70, 2V(Meas)=45-77.

Pleochroism (x):

yellowish brown.

Pleochroism (y):

yellowish brown.

Pleochroism (z):

opaque.

Calculated Properties of Titantaramellite

Electron Density:

r_electron=3.65 gm/cc
note: r_{Titantaramellite}=3.97 gm/cc.

Fermion Index

Fermion Index = 0.08545
Boson Index = 0.91455

Photoelectric:

PE_{Titantaramellite}= 165.23 barns/electron
U=PE_{Titantaramellite} x r_electron= 603.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Titantaramellite is Not Radioactive

Titantaramellite Classification

Dana Class:

64.3.1.2 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.3)4-membered rings with [Si2O7] dimers

(64.3.1)Taramellite group

64.3.1.1 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m

64.3.1.2 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m

64.3.1.3 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m

Strunz Class:

VIII/E.08-20 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.08 - Joaquinite group, Baotite - Orthojoaquinite-(Ce) series

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

VIII/E.08-10 Baotite Ba4(Ti,Nb)8Si4O28Cl I 4₁/a 4/m

VIII/E.08-15 Cerchiaraite! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m

VIII/E.08-20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m

VIII/E.08-30 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m

VIII/E.08-40 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m

VIII/E.08-50 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) C 2 2

VIII/E.08-60 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) Pbcm or Pbc2 Ortho

VIII/E.08-70 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2·(H2O) Ccmm or Ccm2 Ortho

VIII/E.08-80 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O) C 2 2

VIII/E.08-89 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)·H2O Ccmm 2/m 2/m 2/m

VIII/E.08-90 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)·(H2O) Ccmm or Ccm21 Ortho

Other Titantaramellite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Titantaramellite :
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 -École des Mines de Paris

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Titantaramellite

Ba4(Ti,Fe+++,Fe++,Mg)4(B2Si8O27)O2Clx X=0 TO 1, with Ti > Fe
Dana No: 64.3.1.2 Strunz No: VIII/E.08-20
Locality:

Notes: