Spiroffite Mineral Data + 
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- 34.5.1.1 Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m
- 34.5.1.2 Zincospiroffite! Zn2Te3O8 C 2/c 2/m
- 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
General Spiroffite Information |
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 Chemical Formula: |
(Mn,Zn)2Te3O8 | ||
| Composition: |
Molecular Weight = 625.90 gm | ||
| Manganese 13.17 % Mn 17.00 % MnO | |||
| Zinc 5.22 % Zn 6.50 % ZnO | |||
| Tellurium 61.16 % Te 76.50 % TeO2 | |||
| Oxygen 20.45 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mn2+1.5Zn0.5Te3O8 | ||
| Environment: |
Secondary mineral found in oxidized, telluride-bearing rocks. | ||
| IMA Status: |
Approved IMA 1962 | ||
| Locality: |
Moctezuma mine ("La Bambolla"), Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Kiril Spiroff (1901-1981), Bulgarian-American economic geologist, Michigan College of Mining and Technology. | ||
| Synonym: |
ICSD 82490 | ||
| PDF 24-470 | |||
Spiroffite Image | |||
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Images:
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Spiroffite Crystallography |
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| Axial Ratios: |
a:b:c =2.4163:1:2.2527 | ||
| Cell Dimensions: |
a = 13, b = 5.38, c = 12.12, Z = 4; beta = 98° V = 839.42 Den(Calc)= 4.95 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3(1), 4.98(1), 4.06(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Spiroffite |
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| Cleavage: |
[???] Distinct, [???] Distinct | ||
| Color: |
Red, Purple. | ||
| Density: |
5.01 | ||
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
| Habit: |
Comb - Drusy layers deposited on top of each other to produce a toothed structure (e.g. amethyst) | ||
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. | ||
| Hardness: |
3.5 - Copper Penny | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Adamantine | ||
| Streak: |
brown red | ||
Optical Properties of Spiroffite |
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| Gladstone-Dale: |
CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1993,KPDmeas= 0.1969,KC= 0.1975 |
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| Optical Data: |
Biaxial (+), a=1.85, b=1.91, g=2.2, bire=0.3500, 2V(Calc)=56, 2V(Meas)=55. | ||
Calculated Properties of Spiroffite |
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| Electron Density: |
relectron=4.36 gm/cc |
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| Fermion Index |
Fermion Index = 0.0511 Boson Index = 0.9489 |
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| Photoelectric: |
PESpiroffite = 222.10 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Spiroffite is Not Radioactive |
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Spiroffite Classification |
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| Dana Class: |
34.5.1.1 (34)Selenites - Tellurites - Sulfites | ||
| (34.5)Dana Type | |||
| (34.5.1)Dana Group | |||
| Strunz Class: |
IV/K.13-10 IV - Oxides | ||
| IV/K - Tellurides with [Te3O8]4- groups | |||
| IV/K.13 - Spiroffite - Carlfriesite series | |||
Other Spiroffite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Spiroffite : 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 - WWW-MINCRYST 13 -École des Mines de Paris Search for Spiroffite using: Visit our Advertisers for Spiroffite : Translate Spiroffite Mineral Data : Ask about Spiroffite here : Print or Cut-and-Paste your Spiroffite Specimen Label here :
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