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Zincospiroffite Mineral Data
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General Zincospiroffite Information
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 Chemical Formula: |
Zn2Te3O8 |
| Composition: |
Molecular Weight = 641.58 gm |
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Zinc 20.38 % Zn 25.37 % ZnO |
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Tellurium 59.67 % Te 74.63 % TeO2 |
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Oxygen 19.95 % O |
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______ ______ |
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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 |
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Zincospiroffite Image |
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Images:
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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 |
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Zincospiroffite Crystallography
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| 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 - Prismatic H-M Symbol (2/m) Space Group: C 2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 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), |
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Physical Properties of Zincospiroffite
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| Color: |
Gray. |
| Diaphaneity: |
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 |
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Optical Properties of Zincospiroffite
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| Optical Data: |
NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1901) where Ncalc=Dcalc*KC+1
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
22.30 |
29.70 |
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| 420 nm |
12.70 |
16.10 |
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| 440 nm |
6.90 |
8.60 |
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| 460 nm |
6.70 |
7.30 |
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| 470 nm |
7.00 |
7.50 |
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| 480 nm |
7.40 |
7.70 |
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| 500 nm |
7.60 |
7.90 |
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| 520 nm |
7.60 |
8.10 |
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| 540 nm |
7.40 |
7.80 |
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| 546 nm |
7.10 |
7.30 |
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| 560 nm |
6.90 |
6.90 |
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| 580 nm |
6.40 |
6.40 |
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| 589 nm |
6.10 |
6.20 |
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| 600 nm |
5.90 |
6.00 |
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| 620 nm |
5.40 |
5.60 |
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| 640 nm |
4.80 |
5.30 |
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| 650 nm |
4.40 |
5.00 |
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| 660 nm |
4.10 |
4.60 |
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| 680 nm |
3.60 |
4.20 |
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| 700 nm |
3.10 |
3.70 |
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Calculated Relative Intensity Colors of Zincospiroffite in Air
Relative
Intensity |
0% |
100% |
200% |
300% |
400% |
500% |
600% |
700% |
800% |
900% |
1000% |
| R1 |
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| R2 |
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Calculated Properties of Zincospiroffite
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| Electron Density: |
Bulk Density (Electron Density)=4.86 gm/cc
note: Specific Gravity of Zincospiroffite =5.57 gm/cc.
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| Fermion Index: |
Fermion Index = 0.05
Boson Index = 0.95 |
| Photoelectric: |
PEZincospiroffite = 220.90 barns/electron
U=PEZincospiroffite x rElectron Density=1,073.94 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zincospiroffite is Not Radioactive |
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Zincospiroffite Classification
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| Dana Class: |
34.05.01.02 (34)Selenites - Tellurites - Sulfites |
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(34.05)Dana Type |
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(34.05.01)Spiroffite Series |
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34.05.01.01 Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m |
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34.05.01.02 Zincospiroffite! Zn2Te3O8 C 2/c 2/m |
| Strunz Class: |
04.JK.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.J - Arsenites, Antimonites, Bismuthites, Sulfites, |
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04.JK -Tellurites without additional anions, without H2O |
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04.JK.10 Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m |
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04.JK.10 Zincospiroffite! Zn2Te3O8 C 2/c 2/m |
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Other Zincospiroffite Information
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| 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Zincospiroffite
Zn2Te3O8
Dana No: 34.05.01.02 Strunz No: 04.JK.10
Locality:
Notes:
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