Mineralogy Database

Spiroffite Mineral Data

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General Spiroffite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Zn)2Te3O8
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+1.5Zn0.5Te3O8
Help on Environment: Environment: Secondary mineral found in oxidized, telluride-bearing rocks.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Moctezuma mine ("La Bambolla"), Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kiril Spiroff (1901-1981), Bulgarian-American economic geologist, Michigan College of Mining and Technology.
Help on Name Pronunciation: Name Pronunciation: Spiroffite + Pronunciation Say SPIROFFITE
Help on Synonym: Synonym: ICSD 82490
  PDF 24-470

Spiroffite Image

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Comments: Milky yellow crystalline aggregate of Spiroffite on matrix.
Location: Moctezuma mine, Sonora, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Spiroffite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.4163:1:2.2527
Help on Cell Dimensions: Cell Dimensions: a = 13, b = 5.38, c = 12.12, Z = 4; beta = 98° V = 839.42 Den(Calc)= 4.95
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3(1), 4.98(1), 4.06(0.8),

Physical Properties of Spiroffite

Help on Cleavage: Cleavage: {???} Distinct, {???} Distinct
Help on Color: Color: Red, Purple.
Help on Density: Density: 5.01
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Comb - Drusy layers deposited on top of each other to produce a toothed structure (e.g. amethyst)
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brown red

Optical Properties of Spiroffite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Spiroffite =5.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PESpiroffite = 222.10 barns/electron
U=PESpiroffite x rElectron Density= 968.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Spiroffite is Not Radioactive

Spiroffite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.05)Dana Type
  (34.05.01)Spiroffite Series Spiroffite (Mn,Zn)2Te3O8 C 2/c 2/m Zincospiroffite! Zn2Te3O8 C 2/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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

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Dana No: Strunz No: 04.JK.10





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