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Bafertisite (Bafertisit)

Pictures (4 Images total)

orangerote Bafertisit-Plättchen mit Aegirin
Views (File:
1240127313
): 2203
orangerote Bafertisit-Plättchen mit Aegirin
in Dolomit; Bildbreite: 4 mm; Fundort: Bayan-Obo-Lagerstätte, Vereinigtes Darhan-Mumingan-Banner, Baotou, Innere Mongolei, China
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: China/Innere Mongolei (Neimenggu)/Baotou/Vereinigtes Darhan-Mumingan-Banner/Bayan Obo/Bayan Obo SE-Fe-Nb-Lagerstätte
Mineral: Bafertisite
Image: 1240127313
Rating: 7 (votes: 2)
License: Usage for Mineralienatlas project only
orangerote Bafertisit-Plättchen mit Aegirin

in Dolomit; Bildbreite: 4 mm; Fundort: Bayan-Obo-Lagerstätte, Vereinigtes Darhan-Mumingan-Banner, Baotou, Innere Mongolei, China
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-04-19
Locality: Bayan Obo SE-Fe-Nb-Lagerstätte / Bayan Obo / Vereinigtes Darhan-Mumingan-Banner / Baotou / Innere Mongolei (Neimenggu) / China
Bafertisit-Spaltkristall in Fenit
Views (File:
1240128094
): 6001
Bafertisit-Spaltkristall in Fenit
Größe: 12 mm; Fundort: Verkhnee-Espe-Massiv, Tarbagatai-Gebirge, Ostkasachstan, Kasachstan
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Kasachstan/Schyghys Qasaqstan oblysy (Ostkasachstan)/Tarbagatai-Gebirge/Verkhnee-Espe-Massiv
Mineral: Bafertisite
Image: 1240128094
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Bafertisit-Spaltkristall in Fenit

Größe: 12 mm; Fundort: Verkhnee-Espe-Massiv, Tarbagatai-Gebirge, Ostkasachstan, Kasachstan
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-04-19
Locality: Verkhnee-Espe-Massiv / Tarbagatai-Gebirge / Schyghys Qasaqstan oblysy (Ostkasachstan) / Kasachstan
Bafertisit (rot)
Views (File:
1240127134
): 1352
Bafertisit (rot)
Größe: 10x08x03 mm; Fundort: Bayan-Obo-Lagerstätte, Vereinigtes Darhan-Mumingan-Banner, Baotou, Innere Mongolei, China
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: China/Innere Mongolei (Neimenggu)/Baotou/Vereinigtes Darhan-Mumingan-Banner/Bayan Obo/Bayan Obo SE-Fe-Nb-Lagerstätte
Mineral: Bafertisite
Image: 1240127134
License: Usage for Mineralienatlas project only
Bafertisit (rot)

Größe: 10x08x03 mm; Fundort: Bayan-Obo-Lagerstätte, Vereinigtes Darhan-Mumingan-Banner, Baotou, Innere Mongolei, China
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-04-19
Locality: Bayan Obo SE-Fe-Nb-Lagerstätte / Bayan Obo / Vereinigtes Darhan-Mumingan-Banner / Baotou / Innere Mongolei (Neimenggu) / China
roter Bafertisit
Views (File:
1240128286
): 1058
roter Bafertisit
mit schwarzem Aegirin und gelbgrünem Sphalerit; Bildbreite: 12 mm; Fundort: Dara-i-Pioz-Gletscher, Alayskiy (Alai) Range, Tien-Shan-Gebirge, Tadschikistan
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Tadschikistan/Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij)/Dara-i-Pioz (Darai-Pioz)
Mineral: Bafertisite
Image: 1240128286
License: Usage for Mineralienatlas project only
roter Bafertisit

mit schwarzem Aegirin und gelbgrünem Sphalerit; Bildbreite: 12 mm; Fundort: Dara-i-Pioz-Gletscher, Alayskiy (Alai) Range, Tien-Shan-Gebirge, Tadschikistan
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-04-19
Locality: Dara-i-Pioz (Darai-Pioz) / Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij) / Tadschikistan

Collectors Summary

Color weiß, gelblich weiß, grau, hellbraun
Streak color weiß
Hardness (Mohs) 5
Crystal System triklin, C1

Chemism

Chemical formula

Ba2Fe2+4Ti2(Si2O7)2O2(OH)2F2

Chemical composition

Barium, Eisen, Silicium, Titan, Fluor, Sauerstoff, Wasserstoff

Unit weight: 977.9439005 u; Number of atoms in the formula: 32

Info

Empirical formula:

Ba2Fe4Ti2(Si2O7)2O2(OH)2F2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.21

2

6.25

1.0079470

2.0158940
Oxygen

O

29.45

18

56.25

15.9994300

287.9897400
Fluorine

F

3.89

2

6.25

18.9984033

37.9968065
Silicon

Si

5.74

2

6.25

28.0855300

56.1710600
Titanium

Ti

9.79

2

6.25

47.8671000

95.7342000
Iron

Fe

22.84

4

12.50

55.8452000

223.3808000
Barium

Ba

28.08

2

6.25

137.3277000

274.6554000

Analysis wt%

SiO2 : 25.18, TiO2 : 14.27, Al2O3 : 1.00, Fe2O3 : 3.67, FeO : 10.82, MnO : 12.77, BaO : 26.59, H2O : 2.16, F : 3.50 (Ref: Tr.Min.71)

Strunz 9th edition incl. updates

9.BE.55

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
E: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in oktahedraler [6] und größerer Koordination
55:Bafertisit-Gruppe

Lapis Classification

VIII/C.15-020

VIII: SILIKATE
C: Gruppensilikate
15: Gruppensilikate [Si2O7] 6-, mit tetraederfremden Anionen (O,OH,F); Bafertisit-Reihe

Classification by Hölzel

9.BH.200

9: SILICATES
B: Sorosilicates
H: Rosenbuschite-Lamprophyllite-Group

Dana 8th edition

56.02.06b.01

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
02: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with cations in [4] and/or >[4] coordination
06b: Seidozerite - Lamprophyllite group (Bafertisite subgroup)

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Seidozerite supergroup  ⇒ Bafertisite group

Optical Properties

Color

weiß, gelblich weiß, grau, hellbraun

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.055
Birefringence chart\! Bafertisite title=Birefringence chart Bafertisite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.805 - 1.808

RI value β

1.835

RI value γ / ε

1.860 - 1.862

Ri mean

1.843

2V angle

Biaxial (-) 54° - 86° (gemessen) 84.8° (berechnet)

Orientation

Y = b, X ^ a = 5

Absorption

X > Z

Pleochroism

gelblich, gelblichrot, rötlichbraun

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

1

Space Group

C1

Cell parameters a (Å)

10.665(2)

Cell parameters b (Å)

13.743(2)

Cell parameters c (Å)

11.721(3)

Cell parameters a/b or c/a

0.776

Cell parameters c/b

0.853

Cell parameters α

90.30(4)°

Cell parameters β

112.27(2)°

Cell parameters γ

90.00(3)°

Z

4

Volumne (ų)

1589.767

X-Ray Powder Diffraction

2.65(100),
2.52(30),
2.23(30),
2.11(40),
2.07(30),
1.75(30),
1.72(40),
1.57(30)
XRD chart Bafertisite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.1 (gemessen) 4.35 (berechnet)

4.086 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

China/Innere Mongolei (Neimenggu)/Baotou/Vereinigtes Darhan-Mumingan-Banner/Bayan Obo/Bayan Obo SE-Fe-Nb-Lagerstätte

Preface

Author (Name, Year)

Peng, 1959

References

Canadian Mineralogist 44 (2006), 1273

IMA 15-I: Bafertisite Proposal 15-I is accepted, and the chemical formula of bafertisite is revised as follows: Ba2Fe2+ 4 Ti2(Si2O7)2O2(OH)2F2, with Z=4. Fe2+ is the dominant cation of the O sheet, OH and F are ordered at the XO A and XP M sites and must be presented as two groups of anions in the mineral formula: (OH)2 and F2. The structural data for bafertisite (holotype material) are: triclinic; space group C1; a=10.665(2), b=13.743(2), c=11.721(3) Å, α=90.30(4), ß=112.27(2), γ=90.00(3)°, V= 1589.8(8) Å3. - CNMNC Newsletter No. 28, December 2015, page 1864; Mineralogical Magazine, 79, 1859–1864.

IMA group assignments

 
Seidozerite supergroup
 
 
 

 
 
Bafertisite group
 
 
 

 
 
 
Bafertisite
Ba2Fe2+4Ti2(Si2O7)2O2(OH)2F2
triklin
C1

 
 
 
Yoshimuraite
Ba2Mn2+2Ti(Si2O7)(PO4)O(OH)
triklin
P1

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Actuality: 26. Mar 2023 - 17:39:15

Other languages

German

Bafertisit

Spanish

Bafertisita

English

Bafertisite

French

Bafertisite

Russian

Бафертисит

Traditional Chinese

矽鋇鐵鈦石

Simplified Chinese

硅钡铁钛石

CNMNC symbol

Symbol

Bft

Locations with GPS information