Zincospiroffite Mineral Data

Zincospiroffite Mineral Data

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General Zincospiroffite Information

Chemical Formula:

Zn2Te3O8

Composition:

Molecular Weight = 641.58 gm

Zinc 20.38 % Zn 25.37 % ZnO

Tellurium 59.67 % Te 74.63 % TeO₂

Oxygen 19.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₂Te₃O₈

Environment:

Secondary co-oxidation of calaverite. Related to spiroffite.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Zhonshangou gold deposit in Chonli County, Hebei Province, China. Link to MinDat.org Location Data.

Name Origin:

The name reflects the similarity with the unit-cell parameters and composition to spiroffite

Synonym:

IMA2002-047

Zincospiroffite Image

Images:

Zincospiroffite

Comments: Polished section showing zincospiroffite (x) intergrown with native gold (Ng) as the oxidation products of calaverite (Cv) + sphalerite (Sph) ? pyrite. (CanMin, v 42, p 765).
Location: Quartz ore of the Zhongshangou gold deposit, Chongli County, Hebei Province, China. Scale: Field of view 2 mm.
© Canadian Mineralogist

Zincospiroffite Crystallography

Axial Ratios:

a:b:c =2.4699:1:2.2951

Cell Dimensions:

a = 12.72, b = 5.15, c = 11.82, Z = 4; beta = 99.2° V = 764.34 Den(Calc)= 5.57

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.929(0.5)(113), 1.599(0.25)(425), 1.985(0.25)(223),2.155(0.25)(023,511), 3.24(0.25)(311), 4.758(0.25)(110), 2.82(0.25)(204),

Physical Properties of Zincospiroffite

Color:

Gray.

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

dar green

Optical Properties of Zincospiroffite

Optical Data:

NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1901) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Weak.

RL Bireflectance:

Weak.

RL Color:

Gray with no internal reflections.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Zincospiroffite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	22.30	29.70
420 nm	12.70	16.10
440 nm	6.90	8.60
460 nm	6.70	7.30
470 nm	7.00	7.50
480 nm	7.40	7.70
500 nm	7.60	7.90
520 nm	7.60	8.10
540 nm	7.40	7.80
546 nm	7.10	7.30
560 nm	6.90	6.90
580 nm	6.40	6.40
589 nm	6.10	6.20
600 nm	5.90	6.00
620 nm	5.40	5.60
640 nm	4.80	5.30
650 nm	4.40	5.00
660 nm	4.10	4.60
680 nm	3.60	4.20
700 nm	3.10	3.70

**Calculated Relative Intensity Colors of Zincospiroffite in Air**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	1000%
R₁
R₂

Calculated Properties of Zincospiroffite

Electron Density:

r_electron=4.86 gm/cc
note: r_{Zincospiroffite}=5.57 gm/cc.

Fermion Index

Fermion Index = 0.05612
Boson Index = 0.94388

Photoelectric:

PE_{Zincospiroffite}= 220.90 barns/electron
U=PE_{Zincospiroffite} x r_electron=1,073.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zincospiroffite is Not Radioactive

Zincospiroffite Classification

Dana Class:

34.5.1.2 (34)Selenites - Tellurites - Sulfites

(34.5)Dana Type

(34.5.1)Dana Group

34.5.1.1 Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m

34.5.1.2 Zincospiroffite ! Zn2Te3O8 C 2/c 2/m

Strunz Class:

IV/K.13-05 IV - Oxides

IV/K - Tellurides with [Te3O8]4- groups

IV/K.13 - Spiroffite - Carlfriesite series

IV/K.13-05 Zincospiroffite Zn2Te3O8 C 2/c 2/m

IV/K.13-10 Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m

IV/K.13-20 Mroseite CaTe(CO3)O2 P bca 2/m 2/m 2/m

IV/K.13-30 Carlfriesite CaTe2TeO8 C 2/c 2/m

Other Zincospiroffite Information

References:

NAME( CanMin, v 42, p 763) PHYS. PROP.(CanMin, v 42, p 763) OPTIC PROP.(CanMin, v 42, p 763)

See Also:

Links to other databases for Zincospiroffite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Zincospiroffite

Zn2Te3O8
Dana No: 34.5.1.2 Strunz No: IV/K.13-05
Locality:

Notes: