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Liskeardite (Liskeardit)

Pictures (5 Images total)

Liskeardit
Views (File:
1313218584
): 907
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
): 737
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
): 492
Liskeardit
Liskeardit (xx); Grube Tannenberg, Mühlleithen, Vogtland, Sachsen, BRD; Bildbreite: 5 mm
Copyright: chribiedav; Contribution: chribiedav
Collection: chribiedav
Location: Deutschland/Sachsen/Vogtlandkreis/Muldenhammer/Tannenbergsthal/Schneckenstein/Grube Tannenberg (Schacht 176)
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 (Schacht 176) / Schneckenstein / Tannenbergsthal / Muldenhammer / Vogtlandkreis / Sachsen / Deutschland
Liskeardit
Views (File:
1529963312
): 475
Liskeardit
Liskeardit (xx); Grube Tannenberg, Mühlleithen, Vogtland, Sachsen, BRD; Bildbreite: 3,5 mm
Copyright: chribiedav; Contribution: chribiedav
Collection: chribiedav
Location: Deutschland/Sachsen/Vogtlandkreis/Muldenhammer/Tannenbergsthal/Schneckenstein/Grube Tannenberg (Schacht 176)
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 (Schacht 176) / Schneckenstein / Tannenbergsthal / Muldenhammer / Vogtlandkreis / Sachsen / Deutschland
Verwachsung von Bettertonit mit Liskeardit
Views (File:
1591631261
): 426
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

Preface

Name from

dem Liskeard District, in dem die Typlokalität liegt

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

IDs

GUSID (Global unique identifier short form) Pv1zoBHZGEuKtsTm8abw2w
GUID (Global unique identifier) A073FD3E-D911-4B18-8AB6-C4E6F1A6F0DB
Database ID 2226