Zemannite Mineral Data

Zemannite Mineral Data +

General Zemannite Information

Chemical Formula:

Mg0.5[Zn++Fe+++(TeO3)3]·4.5(H2O)

Composition:

Molecular Weight = 741.25 gm

Magnesium 1.64 % Mg 2.72 % MgO

Zinc 8.82 % Zn 10.98 % ZnO

Iron 7.53 % Fe 10.77 % Fe₂O₃

Tellurium 51.64 % Te 64.59 % TeO₂

Hydrogen 1.22 % H 10.94 % H₂O

Oxygen 29.14 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_0.5ZnFe³⁺(TeO₃)₃·4.5(H₂O)

Environment:

Secondary mineal assoiated with other tellurium oxysalts.

IMA Status:

Approved IMA 1969

Locality:

Moctezuma mine ("La Bambolla"), Moctezuma, Sonora Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for Josef Zemann (1923-), Austrian mineralogist, University of Vienna, who studied tellurium oxysalts.

Synonym:

ICSD 79849

PDF 31-1310

Zemannite Image

Images:

Zemannite

Comments: Root beer-colored zemannite hexagonal prisms.
Location: Moctezuma mine, Sonora, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Zemannite Crystallography

Axial Ratios:

a:c = 1:0.8119

Cell Dimensions:

a = 9.41, c = 7.64, Z = 2; V = 585.87 Den(Calc)= 4.20

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

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

By Intensity(I/I_o): 8.15(1), 2.778(0.9), 4.07(0.8),

Crystal Structure:

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Miletich F , European Journal of Mineralogy , 7 (1995) p.509-523, Crystal chemistry of the microporous tellurite minerals

View Additional jPOWD Structure files for Zemannite
[1]

Physical Properties of Zemannite

Cleavage:

None

Color:

Light brown, Dark brown.

Density:

4.05

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Luster:

Vitreous - Adamantine

Optical Properties of Zemannite

Dichroism (e):

reddish brown.

Dichroism (w):

yellowish brown.

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2119,KPDmeas= 0.2198,KC= 0.2237

Optical Data:

Uniaxial (+), w=1.85, e=1.93, bire=0.0800.

Calculated Properties of Zemannite

Electron Density:

r_electron=3.66 gm/cc
note: r_Zemannite=4.05 gm/cc.

Fermion Index

Fermion Index = 0.04825
Boson Index = 0.95175

Photoelectric:

PE_Zemannite= 182.48 barns/electron
U=PE_Zemannite x r_electron= 668.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zemannite is Not Radioactive

Zemannite Classification

Dana Class:

34.3.2.1 (34)Selenites - Tellurites - Sulfites

(34.3)Dana Type

(34.3.2)Dana Group

34.3.2.1 Zemannite Mg0.5[ZnFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

34.3.2.2 Kinichilite Mg0.5[MnFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

34.3.2.3 Keystoneite Mg0.5[NiFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

Strunz Class:

IV/K.10-30 IV - Oxides

IV/K - Sulfides, selenides, tellurides with [XO3]2- groups and related structures

IV/K.10 - Keystoneite - Francisite series

IV/K.10-10 Keystoneite Mg0.5[NiFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

IV/K.10-20 Kinichilite Mg0.5[MnFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

IV/K.10-30 Zemannite Mg0.5[ZnFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

IV/K.10-40 Quetzalcoatlite Zn8Cu4(TeO3)3(OH)18 C6322 6 2 2

IV/K.10-50 Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/m

Other Zemannite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Zemannite :
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 -École des Mines de Paris

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Zemannite

Mg0.5[Zn++Fe+++(TeO3)3]·4.5(H2O)
Dana No: 34.3.2.1 Strunz No: IV/K.10-30
Locality:

Notes: