Taramellite Mineral Data (original) (raw)

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:

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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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above

| | 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Taramellite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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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: