Liskeardite Mineral Data

General Liskeardite Information

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.

Name Pronunciation:

Liskeardite + Pronunciation

Liskeardite Image

Images:

Liskeardite

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

Liskeardite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.33(1), 17.6(1), 8.65(0.8),

Physical Properties of Liskeardite

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

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.

Calculated Properties of Liskeardite

Electron Density:

Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Liskeardite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.0029524146
Boson Index = 0.9970475854

Photoelectric:

PE_Liskeardite= 15.13 barns/electron
U=PE_Liskeardite x rElectron Density= 47.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Liskeardite is Not Radioactive

Liskeardite Classification

Dana Class:

42.01.01.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.01)where (A)3 (XO4) Zq · x(H2O)

(42.01.01)Dana Group

42.01.01.01 Liskeardite (Al,Fe)3(AsO4)(OH)6•5(H2O) Unk Ortho

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

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 :

Liskeardite

(Al,Fe+++)3(AsO4)(OH)6•5(H2O)
Dana No: 42.01.01.01 Strunz No: 08.DF.10
Locality:

Notes: