Bafertisite Mineral Data

General Bafertisite Information

Chemical Formula:

Ba(Fe++,Mn)2TiSi2O7(O,OH)2

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

Empirical Formula:

BaFe²⁺_1.5Mn²⁺_0.5TiSi₂O_8.5(OH)_0.5

Environment:

Alkaline igneous rocks.

IMA Status:

Approved IMA 1959

Locality:

Bayan Obo REE deposit, Inner Mongolia, Juangsu Province, China. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Ba, ferrous, Ti, Si).

Name Pronunciation:

Bafertisite + Pronunciation

Synonym:

ICSD 20369

PDF 14-541

Bafertisite Image

Images:

Bafertisite

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

Images:

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

Axial Ratios:

a:b:c =0.7781:1:0.9139

Cell Dimensions:

a = 10.612, b = 13.637, c = 12.464, Z = 8; beta = 119.49° V = 1,570.05 Den(Calc)= 4.21

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.65(1), 1.72(0.4), 2.11(0.4),

Physical Properties of Bafertisite

Cleavage:

{001} Perfect, {010} Poor

Color:

Red, Yellowish red, Light brown.

Density:

3.96 - 4.25, Average = 4.1

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bafertisite

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

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.

Pleochroism (x):

yellow red or brownish red.

Pleochroism (y):

yellow or yellow.

Pleochroism (z):

pale yellow or greenish yellow.

Calculated Properties of Bafertisite

Electron Density:

Bulk Density (Electron Density)=3.80 gm/cc
note: Specific Gravity of Bafertisite =4.11 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Bafertisite= 128.54 barns/electron
U=PE_Bafertisite x rElectron Density= 488.26 barns/cc.

Radioactivity:

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

Bafertisite Classification

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

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

References:

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

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
15 - WWW-MINCRYST

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Bafertisite

Ba(Fe++,Mn)2TiSi2O7(O,OH)2
Dana No: 56.02.06b.01 Strunz No: 09.BE.55
Locality:

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