Bafertisite Mineral Data

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).

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

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 - DomaticH-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

Diaphaniety:

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

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:

r_electron=3.80 gm/cc
note: r_Bafertisite=4.11 gm/cc.

Fermion Index

Fermion Index = 0.07067
Boson Index = 0.92933

Photoelectric:

PE_Bafertisite= 128.54 barns/electron
U=PE_Bafertisite x r_electron= 488.26 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bafertisite is Not Radioactive

Bafertisite Classification

Dana Class:

56.2.6b.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.6b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)

56.2.6b.1 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

56.2.6b.2 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

56.2.6b.3 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7·2(H2O) A2/m 2/m

56.2.6b.4 Surkhobite! (Ca,Na)(Ba,K)(Fe,Mn)4Ti2(Si4O14)O2(F,OH,O)3 C 2 2

Strunz Class:

VIII/C.15-20 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.15 - Bafertisite series

VIII/C.15-10 Fresnoite Ba2TiSi2O8 P 4bm 4mm

VIII/C.15-20 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

VIII/C.15-30 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

VIII/C.15-40 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m

Other Bafertisite Information

References:

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

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Bafertisite

Ba(Fe++,Mn)2TiSi2O7(O,OH)2
Dana No: 56.2.6b.1 Strunz No: VIII/C.15-20
Locality:

Notes: