Mineralogy Database

Liskeardite Mineral Data

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General Liskeardite Information

Help on Chemical  Formula: Chemical Formula: (Al,Fe+++)3(AsO4)(OH)6•5(H2O)
Help on Composition: Composition: Molecular Weight = 440.85 gm
   Aluminum  12.24 %  Al   23.13 % Al2O3
   Iron      12.67 %  Fe   18.11 % Fe2O3
   Arsenic   16.99 %  As   26.07 % As2O5
   Hydrogen   3.66 %  H    32.69 % H2O
   Oxygen    54.44 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2Fe3+(AsO4)(OH)6•5(H2O)
Help on Environment: Environment: Secondary mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1878
Help on Locality: Locality: Liskeard, Cornwall, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Liskeardite + Pronunciation Say LISKEARDITE

Liskeardite Image

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Comments: Botryoidal liskeardite crusts.
Location: Saint Hillary, Cornwall, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Liskeardite Crystallography

Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.33(1), 17.6(1), 8.65(0.8),

Physical Properties of Liskeardite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Bluish, Bluish white, Brownish white, Greenish, Greenish white.
Help on Density: Density: 3.1
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Streak: Streak: white

Optical Properties of Liskeardite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.157 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2177,KC= 0.2583
Ncalc = 1.8
Help on Optical Data: Optical Data: Biaxial (+), a=1.661, b=1.675, g=1.689, bire=0.0280, 2V(Calc)=88, 2V(Meas)=90.

Calculated Properties of Liskeardite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Liskeardite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0029524146
Boson Index = 0.9970475854
Help on Photoelectric: Photoelectric: PELiskeardite = 15.13 barns/electron
U=PELiskeardite x rElectron Density= 47.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Liskeardite is Not Radioactive

Liskeardite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.01)where (A)3 (XO4) Zq � x(H2O)
  (42.01.01)Dana Group Liskeardite (Al,Fe)3(AsO4)(OH)6•5(H2O) Unk Ortho
Help on  Strunz Class: Strunz Class: 08.DF.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DF -With only medium-sized cations, (OH,etc.):RO4 > 3:1
08.DF.10 Bolivarite Al2(PO4)(OH)3•4-5(H2O) None
08.DF.10 Evansite Al3(PO4)(OH)6•6(H2O)(?) None
08.DF.10 Liskeardite (Al,Fe)3(AsO4)(OH)6•5(H2O) Unk Ortho
08.DF.10 Rosieresite (Pb,Cu,Al)(PO4)x•n(H2O) None

Other Liskeardite Information

Help on References: References: NAME( Dana8) 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 Liskeardite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DF.10





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