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Liskeardite Mineral Data
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General Liskeardite Information
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 Chemical Formula: |
(Al,Fe+++)3(AsO4)(OH)6•5(H2O) |
| Composition: |
Molecular Weight = 440.85 gm |
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Aluminum 12.24 % Al 23.13 % Al2O3 |
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Iron 12.67 % Fe 18.11 % Fe2O3 |
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Arsenic 16.99 % As 26.07 % As2O5 |
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Hydrogen 3.66 % H 32.69 % H2O |
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Oxygen 54.44 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Al2Fe3+(AsO4)(OH)6•5(H2O) |
| Environment: |
Secondary mineral. |
| IMA Status: |
Valid Species (Pre-IMA) 1878 |
| Locality: |
Liskeard, Cornwall, England. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Liskeardite + Pronunciation  |
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Liskeardite Image |
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Images:
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Liskeardite Crystallography
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| Crystal System: |
Orthorhombic Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 3.33(1), 17.6(1), 8.65(0.8), |
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Physical Properties of Liskeardite
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| Cleavage: |
{???} Good |
| Color: |
Bluish, Bluish white, Brownish white, Greenish, Greenish white. |
| Density: |
3.1 |
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
| Hardness: |
1-2 - Between Talc and Gypsum |
| Streak: |
white |
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Optical Properties of Liskeardite
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| Gladstone-Dale: |
CI meas= 0.157 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2177,KC= 0.2583
Ncalc = 1.8 |
| Optical Data: |
Biaxial (+), a=1.661, b=1.675, g=1.689, bire=0.0280, 2V(Calc)=88, 2V(Meas)=90. |
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Calculated Properties of Liskeardite
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| Electron Density: |
Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Liskeardite =3.10 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0029524146
Boson Index = 0.9970475854 |
| Photoelectric: |
PELiskeardite = 15.13 barns/electron
U=PELiskeardite x rElectron Density= 47.01 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Liskeardite is Not Radioactive |
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Liskeardite Classification
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| Dana Class: |
42.01.01.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.01)where (A)3 (XO4) Zq � x(H2O) |
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(42.01.01)Dana Group |
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42.01.01.01 Liskeardite (Al,Fe)3(AsO4)(OH)6•5(H2O) Unk Ortho |
| Strunz Class: |
08.DF.10 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DF -With only medium-sized cations, (OH,etc.):RO4 > 3:1 |
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08.DF.10 Bolivarite Al2(PO4)(OH)3•4-5(H2O) None |
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08.DF.10 Evansite Al3(PO4)(OH)6•6(H2O)(?) None |
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08.DF.10 Liskeardite (Al,Fe)3(AsO4)(OH)6•5(H2O) Unk Ortho |
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08.DF.10 Rosieresite (Pb,Cu,Al)(PO4)x•n(H2O) None |
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Other Liskeardite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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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Print or Cut-and-Paste your Liskeardite Specimen Label here :
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Liskeardite
(Al,Fe+++)3(AsO4)(OH)6•5(H2O)
Dana No: 42.01.01.01 Strunz No: 08.DF.10
Locality:
Notes:
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