Ankangite Mineral Data

Ankangite Mineral Data +

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General Ankangite Information

Chemical Formula:

Ba(Ti,V+++,Cr+++)8O16

Composition:

Molecular Weight = 803.05 gm

Barium 18.81 % Ba 21.00 % BaO

Titanium 32.79 % Ti 54.71 % TiO₂

Vanadium 15.22 % V 22.40 % V₂O₃

Chromium 1.29 % Cr 1.89 % Cr₂O₃

Oxygen 31.88 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba_1.1Ti_5.5V³⁺_2.4Cr_0.2O₁₆

Environment:

In a quartz vein.

IMA Status:

Approved IMA 1989

Locality:

Shiti Barite deposit, Ankang County, Shaanxi Provice, China. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 68631

PDF 41-1427

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Ankangite Crystallography

Axial Ratios:

a:c = 1:0.29204

Cell Dimensions:

a = 10.139, c = 2.961, Z = 1; V = 304.39 Den(Calc)= 4.38

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4/m

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

By Intensity(I/I_o): 3.202(1), 1.589(0.7), 2.476(0.7),

Crystal Structure:

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Shi-bin X , Hai-fu F , Xiao-jing W , Fang-hua L , Acta Crystallographica, Section A , 46 (1990) p.929-934, Direct methods in superspace. II The first application to an unknown, incommensurate modulated structure, Note: this is the average structure, isomorphous with hollandite, Note: y-coordinate of O2 altered from .248 to make regular TiO6 polyhedra, Locality: Shiti barite deposit, Ankang County, Shaanxi, China

Physical Properties of Ankangite

Cleavage:

None

Color:

Black.

Density:

4.44

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6.5 - Pyrite

Luster:

Vitreous - Adamantine

Streak:

grayish black

Optical Properties of Ankangite

Dichroism (e):

pinkish gray.

Dichroism (w):

light pink.

Optical Data:

Uniaxial (?).

NCalc= 2.36 - from Gladstone-Dale relationship (KC = 0.3099) where Ncalc=Dcalc*KC+1
NCalc= 2.38 - from Gladstone-Dale relationship (KC = 0.3099) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Distinct.

RL Bireflectance:

Weak to distinct.

RL Color:

Light rose-reddish gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ankangite in Air**
λ	R₁	R₂		∑ R₁(λ)	∑ R₂(λ)
589 nm	12.80	20.10

**Calculated Relative Intensity Colors of Ankangite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	690%
R₁
R₂

Calculated Properties of Ankangite

Electron Density:

r_electron=4.04 gm/cc
note: r_Ankangite=4.38 gm/cc.

Fermion Index

Fermion Index = 0.07768
Boson Index = 0.92232

Photoelectric:

PE_Ankangite= 90.66 barns/electron
U=PE_Ankangite x r_electron= 366.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ankangite is Not Radioactive

Ankangite Classification

Dana Class:

7.9.4.2 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.4)Dana Group

7.9.4.1 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

7.9.4.2 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

Strunz Class:

IV/D.08-35 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.08 - Cryptomelane group

IV/D.08-10 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

IV/D.08-20 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

IV/D.08-25 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

IV/D.08-30 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

IV/D.08-33 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

IV/D.08-35 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

IV/D.08-40 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

IV/D.08-50 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

IV/D.08-60 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

IV/D.08-70 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

IV/D.08-80 Cesarolite PbH2Mn3O8 HEX-R Trig

Other Ankangite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Ankangite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Ankangite Specimen Label here :

Ankangite

Ba(Ti,V+++,Cr+++)8O16
Dana No: 7.9.4.2 Strunz No: IV/D.08-35
Locality:

Notes: