Lazarenkoite Mineral Data

Lazarenkoite Mineral Data +

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General Lazarenkoite Information

Chemical Formula:

CaFe++As+++3O7·3(H2O)

Composition:

Molecular Weight = 486.73 gm

Calcium 8.23 % Ca 11.52 % CaO

Iron 11.47 % Fe 14.76 % FeO

Arsenic 46.18 % As 60.97 % As₂O₃

Hydrogen 1.24 % H 11.10 % H₂O

Oxygen 32.87 % O

______ ______

100.00 % 98.36 % = TOTAL OXIDE

Empirical Formula:

CaFe²⁺As₃O₇·3(H₂O)

Environment:

Oxidation product on skutterudite-loellingite ores.

IMA Status:

Approved IMA 1981

Locality:

Western Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Eugeni Konstatinovich Lazarenko (1912-1979), mineralogist, academician, Academy of Science, Ukraine.

Lazarenkoite Image

Images:

Lazarenkoite

Comments: Orange, fibrous lazarenkoite in a vug.
Location: Khovu-Asky Ni-Co Deposit, Tuva Republic, Eastern-Siberian Region, Russia. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Lazarenkoite Crystallography

Axial Ratios:

a:b:c =1.7246:1:0.6645

Cell Dimensions:

a = 21.8, b = 12.64, c = 8.4, Z = 10; V = 2,314.64 Den(Calc)= 3.49

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 8.4(1), 4.66(0.9), 11.2(0.9),

Physical Properties of Lazarenkoite

Color:

Light orange.

Density:

3.45

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1 - Talc

Luster:

Resinous

Streak:

light yellow

Optical Properties of Lazarenkoite

Gladstone-Dale:

CI meas= -0.118 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.105 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2574,KPDmeas= 0.2604,KC= 0.233

Optical Data:

Biaxial (-), a=1.82, b=1.92, g=1.955, bire=0.1350, 2V(Calc)=58, 2V(Meas)=30.

Pleochroism (x):

pale yellow.

Pleochroism (y):

pale brown.

Pleochroism (z):

rose brown.

Calculated Properties of Lazarenkoite

Electron Density:

r_electron=3.31 gm/cc
note: r_Lazarenkoite=3.49 gm/cc.

Fermion Index

Fermion Index = 0.0027
Boson Index = 0.9973

Photoelectric:

PE_Lazarenkoite= 36.07 barns/electron
U=PE_Lazarenkoite x r_electron= 119.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lazarenkoite is Not Radioactive

Lazarenkoite Classification

Dana Class:

7.8.3.1 (7)Multiple Oxides

(7.8)where A B (O)2·x(H2O)

(7.8.3)Dana Group

7.8.3.1 Lazarenkoite CaFeAs3O7·3(H2O) Unk Ortho

Strunz Class:

IV/J.06-20 IV - Oxides

IV/J - Arsenides with [AsO3]3-, [AsO2]-, [As2O5]4- groups and unclassified Arsenides

IV/J.06 - Stenhuggarite - Lazarenkoite series

IV/J.06-10 Stenhuggarite CaFe(AsO2)(AsSbO5) I 4₁ 4

IV/J.06-20 Lazarenkoite CaFeAs3O7·3(H2O) Unk Ortho

IV/J.06-25 Vajdakite! [(MoO2)2(H2O)2As2O5]·(H2O) P 2₁/c 2/m

Other Lazarenkoite Information

References:

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

See Also:

Links to other databases for Lazarenkoite :
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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Print or Cut-and-Paste your Lazarenkoite Specimen Label here :

Lazarenkoite

CaFe++As+++3O7·3(H2O)
Dana No: 7.8.3.1 Strunz No: IV/J.06-20
Locality:

Notes: