Leiteite Mineral Data

Leiteite Mineral Data +

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General Leiteite Information

Chemical Formula:

ZnAs+++2O4

Composition:

Molecular Weight = 279.23 gm

Zinc 23.42 % Zn 29.15 % ZnO

Arsenic 53.66 % As 70.85 % As₂O₃

Oxygen 22.92 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

ZnAs₂O₄

IMA Status:

Approved IMA 1977

Locality:

Tsumeb, Namibia Link to MinDat.org Location Data.

Name Origin:

Named for Luis Texeira-Leite (1942-), Portuguese mineral dealer who discovered the mineral.

Synonym:

ICSD 202249

PDF 29-740

Leiteite Image

Images:

Leiteite

Comments: Specimen of leiteite with inclusions of ludlockite. This Leiteite specimen varies from 1 to 3.5 mm in thickness.
Location: Tsumeb Mine, Tsumeb, Namibia. Scale: 3.7 x 1.3 cm.
© John Veevaert

Leiteite Crystallography

Axial Ratios:

a:b:c =0.9044:1:3.5039

Cell Dimensions:

a = 4.542, b = 5.022, c = 17.597, Z = 4; beta = 90.81° V = 401.35 Den(Calc)= 4.62

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.133(1), 3.163(0.76), 1.685(0.49),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Ghose S , Sen Gupta P K , Schlemper E O , American Mineralogist , 72 (1987) p.629-632, Leiteite, ZnAs2O4: A novel type of tetrahedral layer structure with arsenite, chains

Physical Properties of Leiteite

Cleavage:

[100] Perfect

Color:

Brown, Colorless, Pearl white.

Density:

4.31

Diaphaniety:

Transparent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Pearly

Streak:

white

Optical Properties of Leiteite

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.197,KPDmeas= 0.2111,KC= 0.2126

Optical Data:

Biaxial (+), a=1.87, b=1.88, g=1.98, bire=0.1100, 2V(Calc)=38, 2V(Meas)=27. Dispersion r < v very strong.

Calculated Properties of Leiteite

Electron Density:

r_electron=3.95 gm/cc
note: r_Leiteite=4.31 gm/cc.

Fermion Index

Fermion Index = 0.00971
Boson Index = 0.99029

Photoelectric:

PE_Leiteite= 50.04 barns/electron
U=PE_Leiteite x r_electron= 197.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Leiteite is Not Radioactive

Leiteite Classification

Dana Class:

45.1.7.1 (45)Acid and normal Antimonites, Arsenites and Phosphites

(45.1)with miscellaneous formulae

(45.1.7)Dana Group

45.1.7.1 Leiteite ZnAs2O4 P 2₁/c 2/m

Strunz Class:

IV/J.10-20 IV - Oxides

IV/J - Arsenides with [As2O4]2- groups

IV/J.10 - Manganarsite - Leiteite series

IV/J.10-10 Manganarsite Mn3As204(OH)4 P 3₁2 ? 3 2

IV/J.10-20 Leiteite ZnAs2O4 P 2₁/c 2/m

Other Leiteite Information

References:

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

See Also:

Links to other databases for Leiteite :
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

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Print or Cut-and-Paste your Leiteite Specimen Label here :

Leiteite

ZnAs+++2O4
Dana No: 45.1.7.1 Strunz No: IV/J.10-20
Locality:

Notes: