Spiroffite Mineral Data
General Spiroffite Information
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+ 1.5 Zn0.5 Te3 O8
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.
Name Pronunciation:
Spiroffite + Pronunciation
Synonym:
ICSD 82490
PDF 24-470
Spiroffite Image
Images:
Spiroffite Crystallography
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 - Prismatic H-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),
Physical Properties of Spiroffite
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
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 Ncalc = 1.98 - 1.99
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
Electron Density:
Bulk Density (Electron Density)=4.36 gm/cc note: Specific Gravity of Spiroffite =5.01 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PESpiroffite = 222.10 barns/electronU=PESpiroffite x r Electron Density= 968.92 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Spiroffite is Not Radioactive
Spiroffite Classification
Dana Class:
34.05.01.01 (34) Selenites - Tellurites - Sulfites
(34.05) Dana Type
(34.05.01) Spiroffite Series
34.05.01.01 Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m
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
04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
04.JK -Tellurites without additional anions, without H2O
04.JK.10 Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m
04.JK.10 Zincospiroffite ! Zn2Te3O8 C 2/c 2/m
Other Spiroffite Information
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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Spiroffite
(Mn,Zn)2Te3O8
Dana No: 34.05.01.01 Strunz No: 04.JK.10
Locality:
Notes:
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