Chiluite Mineral Data

Chiluite Mineral Data

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General Chiluite Information

Chemical Formula:

Bi6Te++++++2Mo++++++2O21

Composition:

Molecular Weight = 2,036.95 gm

Bismuth 61.56 % Bi 68.63 % Bi₂O₃

Tellurium 12.53 % Te 15.67 % TeO₂

Molybdenum 9.42 % Mo 14.13 % MoO₃

Oxygen 16.49 % O

______ ______

100.00 % 98.43 % = TOTAL OXIDE

Empirical Formula:

Bi₆Te₂Mo₂O₂₁

Environment:

Molybdenite deposit.

IMA Status:

Approved IMA 1989

Locality:

Chilu, Fujian, China. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

Chilunite

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Chiluite Crystallography

Axial Ratios:

a:c = 1:1.36086

Cell Dimensions:

a = 8.97, c = 12.207, Z = 1; V = 850.60 Den(Calc)= 3.98

Crystal System:

HexagonalSpace Group: P 6₃22, P 6₃/m, P 6₃

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

By Intensity(I/I_o): 3.3(1), 3.05(0.9), 2.51(0.5),

Physical Properties of Chiluite

Color:

Yellow.

Density:

3.65

Diaphaniety:

Semitransparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Plumose - "Mica-like" minerals forming aggregates of plume-like forms.

Hardness:

3 - Calcite

Luster:

Sub Metallic

Optical Properties of Chiluite

Gladstone-Dale:

CI meas= -1.176 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.995 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3392,KPDmeas= 0.3699,KC= 0.17

Optical Data:

Uniaxial (-), e=2.3, w=2.4, bire=0.1000.

RL Anisotrophism:

Weak.

RL Color:

Gray with gray-brown internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Chiluite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
410 nm	19.45	20.75
430 nm	19.25	20.45
450 nm	18.80	20.00
470 nm	18.40	19.50
490 nm	18.00	18.90
510 nm	17.75	18.60
530 nm	17.50	18.40
550 nm	17.25	18.25
570 nm	17.00	18.05
590 nm	16.75	17.80
610 nm	16.65	17.60
630 nm	16.50	17.40
650 nm	16.45	17.30
670 nm	16.30	17.20
690 nm	16.75	17.00

**Calculated Relative Intensity Colors of Chiluite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	520%
R₁
R₂

Calculated Properties of Chiluite

Electron Density:

r_electron=3.34 gm/cc
note: r_Chiluite=3.98 gm/cc.

Fermion Index

Fermion Index = 0.03408
Boson Index = 0.96592

Photoelectric:

PE_Chiluite=1,244.46 barns/electron
U=PE_Chiluite x r_electron=4,153.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chiluite is Not Radioactive

Chiluite Classification

Dana Class:

7.11.13.1 (7)Multiple Oxides

(7.11)as titano-oxides with [4] and [6] substitutions

(7.11.13)Dana Group

7.11.13.1 Chiluite Bi6Te2Mo2O21 P 6₃22, P 6₃/m, P 6₃ Hex

Strunz Class:

IV/D.25-70 IV - Oxides

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

IV/D.25 - Cervantite - Chiluite series

IV/D.25-05 Clinocervantite! SbSbO4 C 2/c 2/m

IV/D.25-10 Cervantite SbSbO4 Pbn21 mm2

IV/D.25-20 Stibiocolumbite SbNbO4 Pc21n mm2

IV/D.25-30 Stibiotantalite SbTaO4 Pc21n mm2

IV/D.25-35 Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m

IV/D.25-40 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m

IV/D.25-70 Chiluite Bi6Te2Mo2O21 P 6₃22, P 6₃/m, P 6₃ Hex

Other Chiluite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.76,p666,1991) OPTIC PROP.(AmMin.,Vol.76, p666,1991)

See Also:

Links to other databases for Chiluite :
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 Chiluite Specimen Label here :

Chiluite

Bi6Te++++++2Mo++++++2O21
Dana No: 7.11.13.1 Strunz No: IV/D.25-70
Locality:

Notes: