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.

Name Pronunciation:

Titantaramellite + Pronunciation

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

Images:

Titantaramellite Alforsite Sanbornite Celsian

Comments: SEM image showing alforsite (al). Matrix composed by lamellar sanbornite (sa) and granular quartz (q). Rectangular crystal in the upper right corner is titantaramellite (ti) and isometric crystals included in sanbornite are celsian (ce).
Location: Trumbull Peak, near Incline, Mariposa Co., California, USA. Scale: See Image.
© Pavel M. Kartashov

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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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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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

Diaphaneity:

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

Gladstone-Dale:

CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1912,KPDmeas= 0.1879,KC= 0.1951
Ncalc = 1.77 - 1.8

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:

Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Titantaramellite =3.97 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Titantaramellite is Not Radioactive

Titantaramellite Classification

Dana Class:

64.03.01.02 (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

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 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 - 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

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Titantaramellite

Ba4(Ti,Fe+++,Fe++,Mg)4(B2Si8O27)O2Clx X=0 TO 1, with Ti > Fe
Dana No: 64.03.01.02 Strunz No: 09.CE.20
Locality:

Notes: