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Liskeardite (Liskeardit)

Pictures (5 Images total)

Liskeardit
Views (File:
1313218584
): 879
Liskeardit
Größe: 78x68 mm; Fundort: Marke Valley Mine, Linkinhorne, Caradon-Phoenix Area, Liskeard District, Cornwall, England, UK
Copyright: Rock Currier; Contribution: slugslayer
Collection: British Museum of Natural History
Location: UK/England/Cornwall Co./Liskeard District/Caradon-Phoenix Area/Linkinhorne/Marke Valley Mine
Mineral: Liskeardite
Image: 1313218584
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Liskeardit

Größe: 78x68 mm; Fundort: Marke Valley Mine, Linkinhorne, Caradon-Phoenix Area, Liskeard District, Cornwall, England, UK
Collection: British Museum of Natural History
Copyright: Rock Currier
Contribution: slugslayer 2011-08-13
Locality: Marke Valley Mine / Linkinhorne / Caradon-Phoenix Area / Liskeard District / Cornwall Co. / England / UK
Liskeardit
Views (File:
1274372248
): 721
Liskeardit
Bildbreite: 4 mm, Fundort: Marke Valley Mine, Linkinhorne, Caradon-Phoenix Area, Liskeard District, Cornwall, England, UK
Copyright: Luigi Chiappino; Contribution: thdun5
Location: UK/England/Cornwall Co./Liskeard District/Caradon-Phoenix Area/Linkinhorne/Marke Valley Mine
Mineral: Liskeardite
Image: 1274372248
Rating: 5 (votes: 1)
License: Usage for Mineralienatlas project only
Liskeardit

Bildbreite: 4 mm, Fundort: Marke Valley Mine, Linkinhorne, Caradon-Phoenix Area, Liskeard District, Cornwall, England, UK
Copyright: Luigi Chiappino
Contribution: thdun5 2010-05-20
Locality: Marke Valley Mine / Linkinhorne / Caradon-Phoenix Area / Liskeard District / Cornwall Co. / England / UK
Liskeardit
Views (File:
1529963093
): 459
Liskeardit
Liskeardit (xx); Grube Tannenberg, Mühlleithen, Vogtland, Sachsen, BRD; Bildbreite: 5 mm
Copyright: chribiedav; Contribution: chribiedav
Collection: chribiedav
Location: Deutschland/Sachsen/Vogtlandkreis/Klingenthal/Mühlleithen/Grube Tannenberg
Mineral: Liskeardite
Image: 1529963093
License: Usage for Mineralienatlas project only
Liskeardit

Liskeardit (xx); Grube Tannenberg, Mühlleithen, Vogtland, Sachsen, BRD; Bildbreite: 5 mm
Collection: chribiedav
Copyright: chribiedav
Contribution: chribiedav 2018-06-25
Locality: Grube Tannenberg / Mühlleithen / Klingenthal / Vogtlandkreis / Sachsen / Deutschland
Liskeardit
Views (File:
1529963312
): 444
Liskeardit
Liskeardit (xx); Grube Tannenberg, Mühlleithen, Vogtland, Sachsen, BRD; Bildbreite: 3,5 mm
Copyright: chribiedav; Contribution: chribiedav
Collection: chribiedav
Location: Deutschland/Sachsen/Vogtlandkreis/Klingenthal/Mühlleithen/Grube Tannenberg
Mineral: Liskeardite
Image: 1529963312
License: Usage for Mineralienatlas project only
Liskeardit

Liskeardit (xx); Grube Tannenberg, Mühlleithen, Vogtland, Sachsen, BRD; Bildbreite: 3,5 mm
Collection: chribiedav
Copyright: chribiedav
Contribution: chribiedav 2018-06-25
Locality: Grube Tannenberg / Mühlleithen / Klingenthal / Vogtlandkreis / Sachsen / Deutschland
Verwachsung von Bettertonit mit Liskeardit
Views (File:
1591631261
): 382
Verwachsung von Bettertonit mit Liskeardit
faserige, weiße Verwachsung von Bettertonit mit Liskeardit, Penberthy Croft Mine, St Hilary, Cornwall, England; BB < 1 cm, analysiert mittels XRD
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: UK/England/Cornwall Co./Mount's Bay District/St. Hilary/Penberthy Croft Mine
Mineral: Bettertonite, Liskeardite
Image: 1591631261
License: Usage for Mineralienatlas project only
Verwachsung von Bettertonit mit Liskeardit  X
Analysed with X-ray diffraction XRD

faserige, weiße Verwachsung von Bettertonit mit Liskeardit, Penberthy Croft Mine, St Hilary, Cornwall, England; BB < 1 cm, analysiert mittels XRD
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-06-08
Locality: Penberthy Croft Mine / St. Hilary / Mount's Bay District / Cornwall Co. / England / UK

Collectors Summary

Color bläulich, bläulichweiß, bräunlich weiß, grünlich, grünlichweiß
Streak color weiß
Hardness (Mohs) 1.5
Solubility +++ Säuren

Chemism

Chemical formula

(Al,Fe)32(AsO4)18(OH)42(H2O)22·52H2O

Chemical composition

Aluminium, Arsen, Eisen, Sauerstoff, Wasserstoff

Unit weight: 5642.3101228 u; Number of atoms in the formula: 428

Info

Empirical formula:

(Al0.75Fe0.25)32(AsO4)18(OH)42(H2O)22·52H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.39

190

44.39

1.0079470

191.5099300
Oxygen

O

53.31

188

43.93

15.9994300

3,007.8928400
Aluminium

Al

11.48

24

5.61

26.9815382

647.5569168
Iron

Fe

7.92

8

1.87

55.8452000

446.7616000
Arsenic

As

23.90

18

4.21

74.9216020

1,348.5888360

Analysis wt%

Fe2O3 : 7.64, Al2O3 : 28.23, As2O5 : 26.96, H2O : 34.05, CuO : 1.03, CaO : 0.72, SO3 : 1.11 (Ref: Dana, 7th ed. 2)

Strunz 9th edition incl. updates

8.DF.10

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
F: Mit ausschließlich mittelgroßen [Kationen], (OH, etc.):RO4 > 3:1
10:Liskeardit-Gruppe

Lapis Classification

VII/D.23-040

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
D: Wasserhaltige Phosphate, mit fremden Anionen
23: Mittelgroße Kationen: Cu-Zn-Mn-Al-Fe

Classification by Hölzel

8.DC.370

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
C: Phosphates, Valency for mediumsized Cations: 3
3: OH/XO4 > 1.5 Fluellite-Group

IMA status

Erstbeschreibung vor der Gründung der IMA/CNMNC (grandfathered mineral), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

bläulich, bläulichweiß, bräunlich weiß, grünlich, grünlichweiß

Streak color

weiß

max. Birefringence

0.028
Birefringence chart\! Liskeardite title=Birefringence chart Liskeardite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.661

RI value β

1.675

RI value γ / ε

1.689

Ri mean

1.675

2V angle

Biaxial (+) 90°

Crystallography

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

X-Ray Powder Diffraction

17.6(100),
12.2(60),
8.65(80),
7.85(60),
7.44(60),
4.25(40),
3.33(100),
2.37(60)
XRD chart Liskeardite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

1.5

VHN (Hardness Vickers)

18 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.1

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

UK/England/Cornwall Co./Liskeard District/Caradon-Phoenix Area/Linkinhorne/Marke Valley Mine

Preface

Author (Name, Year)

Maskelyne, 1878

References

Nature 18 (1878), 426

Handbook of Mineralogy (Anthony et al.), 4 (2000), 317

I. E. Grey, W. G. Mumme, C. M. Macrae, T. Caradoc-Davies, J. R. Price, M. S. Rumsey, S. J. Mills, G. D. Gatta: Chiral edge-shared octahedral chains in liskeardite, [(Al,Fe)32(AsO4)18(OH)42(H2O)22]·52H2O, an open framework mineral with a pharmacoalumite-related structure. Mineral Mag Vol. 77, Nr. 8 (2013) S. 3125-3135.

Other languages

German

Liskeardit

Spanish

Liskeardita

French

Liskeardite

English

Liskeardite

CNMNC symbol

Symbol

Lsk

Locations with GPS information