Mineralogy Database

Ojuelaite Mineral Data

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General Ojuelaite Information

Help on Chemical  Formula: Chemical Formula: ZnFe+++2(AsO4)2(OH)2•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: ZnFe3+2(AsO4)2(OH)2•4(H2O)
Help on Environment: Environment: Oxidation zone mineral.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Ojuela mine, Mapimi, Durango, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Ojuelaite + Pronunciation Say OJUELAITE
Help on Synonym: Synonym: ICSD 76007
  PDF 35-516
 

Ojuelaite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0602:1:0.5762
Help on Cell Dimensions: Cell Dimensions: a = 10.247, b = 9.665, c = 5.569, Z = 2; beta = 94.37° V = 549.94 Den(Calc)= 3.39
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.25(1), 2.872(0.9), 7.03(0.82),
 

Physical Properties of Ojuelaite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Greenish yellow.
Help on Density: Density: 3.39
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow
 

Optical Properties of Ojuelaite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.696, b=1.73, g=1.798, bire=0.1020, 2V(Calc)=74, 2V(Meas)=73.
Help on Pleochroism (x): Pleochroism (x): yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): yellow.
 

Calculated Properties of Ojuelaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.26 gm/cc
note: Specific Gravity of Ojuelaite =3.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0091942018
Boson Index = 0.9908057982
Help on Photoelectric: Photoelectric: PEOjuelaite = 29.83 barns/electron
U=PEOjuelaite x rElectron Density= 97.34 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ojuelaite is Not Radioactive
 

Ojuelaite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Ojuelaite

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

 

Notes:

 

 
   
 


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