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Legrandite Mineral Data

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General Legrandite Information

Help on Chemical  Formula: Chemical Formula: Zn2(AsO4)(OH)•(H2O)
Help on Composition: Composition: Molecular Weight = 304.72 gm
   Zinc      42.92 %  Zn   53.42 % ZnO
   Arsenic   24.59 %  As   37.71 % As2O5
   Hydrogen   0.99 %  H     8.87 % H2O
   Oxygen    31.50 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn2(AsO4)(OH)•(H2O)
Help on Environment: Environment: Secondary mineral in zinc orebodies.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1932
Help on Locality: Locality: Ojuela mine near Mapimi, Durango. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Belgian mining engineer, Legrande.
Help on Name Pronunciation: Name Pronunciation: Legrandite + Pronunciation Say LEGRANDITE
Help on Synonym: Synonym: ICSD 34846
  PDF 42-11356
 

Legrandite Image

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  Legrandite

Comments: Prismatic crystal of yellow legrandite on a gossanous matrix.
Location: Mina Ojuela, Mapimi, Durango, Mexico. Scale: 2.5 x 1.7 x 1.4 cm.
© Fabre Minerals

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  Legrandite

Comments: Yellow crystals of legrandite partially covering an iron-oxide gossan.
Location: Oujela Mine, Mapimi, Durango, Mexico. Scale: Crystal size 6 mm.
© John Veevaert

Legrandite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.612:1:1.2871
Help on Cell Dimensions: Cell Dimensions: a = 12.8, b = 7.94, c = 10.22, Z = 8; beta = 104.2° V = 1,006.94 Den(Calc)= 4.02
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): 4.08(1), 5.93(0.71), 6.68(0.71),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 1 0 0) ( 1 1 0) ( 0 0 1)

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Physical Properties of Legrandite

Help on Cleavage: Cleavage: {100} Imperfect
Help on Color: Color: Yellow, Yellowish orange.
Help on Density: Density: 4
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Legrandite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1762,KPDmeas= 0.1771,KC= 0.1756
Ncalc = 1.7 - 1.71
Help on Optical Data: Optical Data: Biaxial (+), a=1.675-1.702, b=1.69-1.709, g=1.735-1.74, bire=0.0380-0.0600, 2V(Calc)=52-62, 2V(Meas)=50.
 

Calculated Properties of Legrandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.80 gm/cc
note: Specific Gravity of Legrandite =4.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELegrandite = 38.57 barns/electron
U=PELegrandite x rElectron Density= 146.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Legrandite is Not Radioactive
 

Legrandite Classification

Help on  Dana Class: Dana Class: 42.06.04.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.06)where (AB)2 (XO4) Zq � x(H2O)
  (42.06.04)Strashimirite Group
 
42.06.04.01 Legrandite Zn2(AsO4)(OH)•(H2O) P 21/c 2/m
 
42.06.04.02 Spencerite Zn4(PO4)2(OH)2•3(H2O) P 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.DC.10 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.10 Legrandite Zn2(AsO4)(OH)•(H2O) P 21/c 2/m
 

Other Legrandite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Legrandite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Legrandite

Zn2(AsO4)(OH)•(H2O)
Dana No: 42.06.04.01 Strunz No: 08.DC.10
Locality:

 

Notes:

 

 
   
 


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