Ojuelaite Mineral Data

Ojuelaite Mineral Data +

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.

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),

Physical Properties of Ojuelaite

Cleavage:

[???] Good

Color:

Greenish yellow.

Density:

3.39

Diaphaniety:

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

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:

r_electron=3.26 gm/cc
note: r_Ojuelaite=3.39 gm/cc.

Fermion Index

Fermion Index = 0.00919
Boson Index = 0.99081

Photoelectric:

PE_Ojuelaite= 29.83 barns/electron
U=PE_Ojuelaite x r_electron= 97.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ojuelaite is Not Radioactive

Ojuelaite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.18)Dana Group

42.11.18.1 Whitmoreite FeFe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

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

42.11.18.3 Ojuelaite ZnFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

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

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

42.11.18.6 Cobaltarthurite! CoFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

Strunz Class:

VII/D.08-50 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.08 - Arthurite group

VII/D.08-10 Kleemanite ZnAl2(PO4)2(OH)2·3(H2O) P 2, P 2₁, P 2/m or P 2₁/m Mono

VII/D.08-20 Whitmoreite FeFe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-30 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-40 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-45 Cobaltarthurite! CoFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-50 Ojuelaite ZnFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-60 Mapimite Zn2Fe3(AsO4)3(OH)4·10(H2O) Cm m

Other Ojuelaite Information

References:

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

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Ojuelaite

ZnFe+++2(AsO4)2(OH)2·4(H2O)
Dana No: 42.11.18.3 Strunz No: VII/D.08-50
Locality:

Notes: