Ojuelaite Mineral Data

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General Ojuelaite Information

Chemical Formula:

ZnFe+++2(AsO4)2(OH)2•4(H2O)

Composition:

Molecular Weight = 561.00 gm

Zinc 11.66 % Zn 14.51 % ZnO

Iron 19.91 % Fe 28.47 % Fe₂O₃

Arsenic 26.71 % As 40.97 % As₂O₅

Hydrogen 1.80 % H 16.06 % H₂O

Oxygen 39.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

ZnFe³⁺₂(AsO₄)₂(OH)₂•4(H₂O)

Environment:

Oxidation zone mineral.

IMA Status:

Approved IMA 1981

Locality:

Ojuela mine, Mapimi, Durango, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Ojuelaite + Pronunciation

Synonym:

ICSD 76007

PDF 35-516

Ojuelaite Image

Images:

Ojuelaite

Comments: Yellow-green ojuelaite masses on limonite and quartz.
Location: Mina Ojuela, Mapimi, Durango, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ojuelaite Crystallography

Axial Ratios:

a:b:c =1.0602:1:0.5762

Cell Dimensions:

a = 10.247, b = 9.665, c = 5.569, Z = 2; beta = 94.37° V = 549.94 Den(Calc)= 3.39

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): 4.25(1), 2.872(0.9), 7.03(0.82),

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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Help on Above

Hughes J M , Bloodaxe E S , Kobel K D , Drexler J W , Mineralogical Magazine , 60 (1996) p.519-521, The atomic arrangement of ojuelaite, ZnFe(3+)2(AsO4)2(OH)2*4H2O, Locality: Ojuela mine, Mapimi, Mexico

Physical Properties of Ojuelaite

Cleavage:

{???} Good

Color:

Greenish yellow.

Density:

3.39

Diaphaneity:

Transparent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Ojuelaite

Gladstone-Dale:

CI meas= 0.064 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2187,KPDmeas= 0.2187,KC= 0.2336
Ncalc = 1.79

Optical Data:

Biaxial (+), a=1.696, b=1.73, g=1.798, bire=0.1020, 2V(Calc)=74, 2V(Meas)=73.

Pleochroism (x):

yellow.

Pleochroism (y):

pale yellow.

Pleochroism (z):

yellow.

Calculated Properties of Ojuelaite

Electron Density:

Bulk Density (Electron Density)=3.26 gm/cc
note: Specific Gravity of Ojuelaite =3.39 gm/cc.

Fermion Index:

Fermion Index = 0.0091942018
Boson Index = 0.9908057982

Photoelectric:

PE_Ojuelaite= 29.83 barns/electron
U=PE_Ojuelaite x rElectron Density= 97.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ojuelaite is Not Radioactive

Ojuelaite Classification

Dana Class:

42.11.18.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.18)Whitmoreite Group

42.11.18.01 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.02 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 2₁/c 2/m

42.11.18.03 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.04 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.05 Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13•H2O P 2₁/n 2/m

42.11.18.06 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.07 Kunatite CuFe2(PO4)2(OH)2•4H2O P 2₁/c 2/m

42.11.18.08 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 2₁/c 2/m

Strunz Class:

08.DC.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

08.DC.15 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Kunatite CuFe2(PO4)2(OH)2•4H2O P 2₁/c 2/m

08.DC.15 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 2₁/c 2/m

Other Ojuelaite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Ojuelaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Ojuelaite

ZnFe+++2(AsO4)2(OH)2•4(H2O)
Dana No: 42.11.18.03 Strunz No: 08.DC.15
Locality:

Notes: