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Bafertisite Mineral Data

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General Bafertisite Information

Help on Chemical  Formula: Chemical Formula: Ba(Fe++,Mn)2TiSi2O7(O,OH)2
Help on Composition: Composition: Molecular Weight = 497.12 gm
   Barium     27.62 %  Ba   30.84 % BaO
   Titanium    9.63 %  Ti   16.07 % TiO2
   Manganese   5.53 %  Mn    7.13 % MnO
   Iron       16.85 %  Fe   21.68 % FeO
   Silicon    11.30 %  Si   24.17 % SiO2
   Hydrogen    0.10 %  H     0.91 % H2O
   Oxygen     28.97 %  O
             ______        ______ 
             100.00 %      100.80 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaFe2+1.5Mn2+0.5TiSi2O8.5(OH)0.5
Help on Environment: Environment: Alkaline igneous rocks.
Help on IMA Status: IMA Status: Approved IMA 1959
Help on Locality: Locality: Bayan Obo REE deposit, Inner Mongolia, Juangsu Province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition (Ba, ferrous, Ti, Si).
Help on Name Pronunciation: Name Pronunciation: Bafertisite + Pronunciation Say BAFERTISITE
Help on Synonym: Synonym: ICSD 20369
  PDF 14-541

Bafertisite Image

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Comments: Tan crystal spray of bafertisite in pegmatite.
Location: Fountain Quarry, Pitt County, North Carolina, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Calcybeborosilite-(Y)   Bafertisite

Comments: Greenish-gray calcybeborosilite-(Y) grain intergrow with orange bafertisite platelet (upper left corner of the later). Associatied minerals are violet fluorite, white albite, black aegirine, light-yellow (red under UV lamp) cleiophane.
Location: Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan. Scale: Picture Size 12x10 mm.
© Pavel M. Kartashov

Bafertisite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7781:1:0.9139
Help on Cell Dimensions: Cell Dimensions: a = 10.612, b = 13.637, c = 12.464, Z = 8; beta = 119.49° V = 1,570.05 Den(Calc)= 4.21
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.65(1), 1.72(0.4), 2.11(0.4),

Physical Properties of Bafertisite

Help on Cleavage: Cleavage: {001} Perfect, {010} Poor
Help on Color: Color: Red, Yellowish red, Light brown.
Help on Density: Density: 3.96 - 4.25, Average = 4.1
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Bafertisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1962,KPDmeas= 0.2012,KC= 0.2108
Ncalc = 1.83 - 1.9
Help on Optical Data: Optical Data: Biaxial (-), a=1.786-1.808, b=1.813-1.835, g=1.852-1.862, bire=0.0540-0.0660, 2V(Calc)=82-88, 2V(Meas)=54-86.
Help on Pleochroism (x): Pleochroism (x): yellow red or brownish red.
Help on Pleochroism (y): Pleochroism (y): yellow or yellow.
Help on Pleochroism (z): Pleochroism (z): pale yellow or greenish yellow.

Calculated Properties of Bafertisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.80 gm/cc
note: Specific Gravity of Bafertisite =4.11 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEBafertisite = 128.54 barns/electron
U=PEBafertisite x rElectron Density= 488.26 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bafertisite is Not Radioactive

Bafertisite Classification

Help on  Dana Class: Dana Class: 56.02.06b.01 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.06b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)
56.02.06b.01 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m
56.02.06b.02 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 21/m 2/m
56.02.06b.03 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7•2(H2O) A2/m 2/m
56.02.06b.04 Surkhobite! KBa3Ca2Na2(Mn,Fe,Fe)16Ti8(Si2O7)8O8(OH)4(F,O,OH)8 C 2 2
56.02.06b.05 Nechelyustovite! (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O P 2/m 2/m
56.02.06b.06 Caryochroite! (Na,Sr)3(Fe,Mg)10[Ti2Si12O37](O,OH)9•8H2O P 2/n (?) 2/m
Help on  Strunz Class: Strunz Class: 09.BE.55 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.55 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m
09.BE.55 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 21/m 2/m
09.BE.55 Nechelyustovite! (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O P 2/m 2/m

Other Bafertisite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Bafertisite :
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

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Dana No: 56.02.06b.01 Strunz No: 09.BE.55





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