Liskeardite Mineral Data + 
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- 42.1.1.1 Liskeardite (Al,Fe)3(AsO4)(OH)6·5(H2O) Unk Ortho
- VII/D.23-10 Sieleckiite Cu3Al4(PO4)2(OH)12·2(H2O) P1 or P1 Tri
- VII/D.23-20 Rosieresite (Pb,Cu,Al)(PO4)x·n(H2O) None
- VII/D.23-30 Evansite Al3(PO4)(OH)6·6(H2O)(?) None
- VII/D.23-40 Liskeardite (Al,Fe)3(AsO4)(OH)6·5(H2O) Unk Ortho
General Liskeardite Information |
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 Chemical Formula: |
(Al,Fe+++)3(AsO4)(OH)6·5(H2O) | ||
| 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 | |||
| 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. | ||
Liskeardite Image | |||
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Images:
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Liskeardite Crystallography |
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| Crystal System: |
OrthorhombicSpace Group: Unk | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.33(1), 17.6(1), 8.65(0.8), | ||
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 | ||
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 |
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| 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 |
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| Electron Density: |
relectron=3.11 gm/cc |
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| Fermion Index |
Fermion Index = 0.00295 Boson Index = 0.99705 |
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| Photoelectric: |
PELiskeardite = 15.13 barns/electron |
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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: |
42.1.1.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen | ||
| (42.1)where (A)3 (XO4) Zq · x(H2O) | |||
| (42.1.1)Dana Group | |||
| Strunz Class: |
VII/D.23-40 VII - Phosphates, Arsenates and Vanadates | ||
| VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe | |||
| VII/D.23 - Sieleckiite - Liskeardite series | |||
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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Liskeardite using: Visit our Advertisers for Liskeardite : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals T G Fine Minerals Wrights Rock Shop Translate Liskeardite Mineral Data : Ask about Liskeardite here : Print or Cut-and-Paste your Liskeardite Specimen Label here :
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