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Aldermanite (Aldermanit)

Pictures (2 Images total)

Aldermanit
Views (File:
1271788814
): 1989
Aldermanit
Aldermanit auf Fluellit. Bildbreite: 6 mm, Fundort: Tom's Phosphate Quarry, Kapunda, South Australia, Australien
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Australien/South Australia/Mt. Lofty Ranges/Kapunda/Tom's Phosphate Quarry
Mineral: Aldermanite
Image: 1271788814
Rating: 4.33 (votes: 3)
License: Usage for Mineralienatlas project only
Aldermanit

Aldermanit auf Fluellit. Bildbreite: 6 mm, Fundort: Tom's Phosphate Quarry, Kapunda, South Australia, Australien
Copyright: Luigi Chiappino
Contribution: thdun5 2010-04-20
Locality: Tom's Phosphate Quarry / Kapunda / Mt. Lofty Ranges / South Australia / Australien
Aldermanit und Minyulit
Views (File:
1353446407
): 1269
Aldermanit und Minyulit
Schuppige weiße Kristalle und prismatische farblose Minyulit-Kristalle, BB = 5 mm, Fundort: Tom's Phosphate Quarry, Kapunda, South Australia, Australien.
Copyright: Heribert Rotter; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: B002812, Donator: Vince Peisley
Location: Australien/South Australia/Mt. Lofty Ranges/Kapunda/Tom's Phosphate Quarry
Mineral: Aldermanite, Minyulite
Image: 1353446407
License: Usage for Mineralienatlas project only
Aldermanit und Minyulit (SNr: B002812)

Schuppige weiße Kristalle und prismatische farblose Minyulit-Kristalle, BB = 5 mm, Fundort: Tom's Phosphate Quarry, Kapunda, South Australia, Australien.
Collection: Lithothek der Münchener Micromounter
Copyright: Heribert Rotter
Contribution: Münchener Micromounter 2012-11-20
Locality: Tom's Phosphate Quarry / Kapunda / Mt. Lofty Ranges / South Australia / Australien

You find additional Aldermanit specimen at the Geolitho Museum

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 1.00 - 2.00
Solubility +++ Säuren
Crystal System monoklin, P21/c

Chemism

Chemical formula

[Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6]⋅H2O

Chemical composition

Aluminium, Magnesium, Natrium, Fluor, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 585.351124575 u; Number of atoms in the formula: 52.5

Info

Empirical formula:

[Mg(H2O)6][Na(H2O)2Al3(PO4)2((OH)0.75F0.25)6]⋅H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.87

22.5

42.86

1.0079470

22.6788075
Oxygen

O

58.77

21.5

40.95

15.9994300

343.9877450
Fluorine

F

4.87

1.5

2.86

18.9984033

28.4976049
Sodium

Na

3.93

1

1.90

22.9897702

22.9897702
Magnesium

Mg

4.15

1

1.90

24.3050600

24.3050600
Aluminium

Al

13.83

3

5.71

26.9815382

80.9446146
Phosphorus

P

10.58

2

3.81

30.9737612

61.9475224

Analysis wt%

MgO : 8.40, CaO : 1.20, Al2O3 : 28.40, P2O5 : 25.90, H2O : 36.10 (Ref: Mineralogical Magazine 81)

Strunz 9th edition incl. updates

8.DE.35

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
E: Mit ausschließlich mittelgroßen [Kationen], (OH, etc.):RO4 = 3:1
35:Aldermanit-Gruppe

Lapis Classification

VII/D.17-010

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

Classification by Hölzel

8.DH.100

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
H: C small to medium, V: 2+3 P/OH < 0.5

Dana 8th edition

42.13.01.01

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
13: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Walentaite group  ⇒ Walentaite subgroup

Optical Properties

Color

farblos

Streak color

weiß

RI value α / ω / n

1.500

RI value β

1.50

RI value γ / ε

1.50

Ri mean

1.500

2V angle

Biaxial

Optical Data Luminescence

Color LW-UV (365nm)

  

grün

Color SW-UV (254nm)

  

grün

LW-UV Other Colors

  

weiß

SW-UV Other Colors

  

weiß

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

13.524(3)

Cell parameters b (Å)

9.958(2)

Cell parameters c (Å)

7.013(1)

Cell parameters a/b or c/a

1.358

Cell parameters c/b

0.704

Cell parameters β

97.40(3)°

Z

2

Volumne (ų)

936.588

X-Ray Powder Diffraction

13.40(100),
7.98(80),
5.70(30),
5.55(60),
4.96(30),
3.47(20),
2.841(50),
2.660(30)
XRD chart Aldermanite

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

Physical Properties

Hardness (Mohs)

1.00 - 2.00

VHN (Hardness Vickers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.15 (berechnet)

2.075 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Australien/South Australia/Mt. Lofty Ranges/South Mt Lofty Ranges/Barossa Valley/Angaston/Moculta Phosphate Quarry (Klemm's Quarry)

Preface

Author (Name, Year)

Harrowfield & Segnit & Watts, 1981

External links

Associazione Micro-mineralogica Italiana

References

Mineralogical Magazine 44 (1981), 59

Elliott, P., Grey, I.E., Willis, A.C.: Redefinition of the formula for aldermanite, [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6]⋅H2O, and its crystal structure. Mineralogical Magazine Vol. 85, Nr. 3 (2021) S. 348-353.

IMA 20-I: Redefinition of Aldermanite - CNMNC Newsletter 60 (2021); Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.30

IMA group assignments

Other languages

German

Aldermanit

Spanish

Aldermanita

English

Aldermanite

French

Aldermanite

Russian

Олдерманит

Simplified Chinese

直水磷镁石

CNMNC (IMA)-Number

IMA 1980-044

CNMNC symbol

Symbol

Adm

Navigation

Elliott, P., Grey, I.E., Willis, A.C. (2021): Redefinition of the formula for aldermanite, [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6]⋅H2O, and its crystal structure. Mineralogical Magazine, 85, (in press).

Abstract: ldermanite from Tom’s quarry in the Kapunda-Angaston area of the Mount Lofty Ranges, South Australia has been characterized by electron microprobe analyses and single-crystal structure analysis. The empirical formula is Na0.72K0.13Ca0.06Mg1.15Al2.92(PO4)2.05[(OH)2.92F2.96]5.88·8.91H2O, based on 23 anions. Analysis of a specimen from the type locality, the nearby Klemms quarry, gave a similar formula, Na0.59K0.06Ca0.36Mg0.92Al3.16(PO4)1.97[(OH)4.08F2.70]somma 6.78·8.36H2O. Na and F were not analysed in the original description of the mineral. The ideal end-member formula is [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH)6]·H2O, compared to the original formula of Mg5Al12(PO4)8(OH)22∙nH2O with n ≈ 32. Aldermanite is monoclinic, P21/c with a = 13.524(3), b = 9.958(2), c = 7.013(1) Å, ꞵ = 97.40(3)°. The crystal structure of aldermanite is built from sawtooth layers of cis- and trans-corner-connected, Al-centred octahedra, decorated with corner-connected PO4 tetrahedra to give (100) layers of composition Al3(PO4)2(OH,F)6. Interlayer Mg(H2O)6 octahedra and H2O molecules hold the layers together through H-bonding. The corner-connected octahedra form 6-membered rings that are centred by 8-coordinated Na and have a topology identical to a 3-octahedra-wide {110} slice of the pyrochlore structure. This pyrochlore element contains intersecting kagomé nets of Al atoms, parallel to (111) and (11-1) of cubic pyrochlore. Minerals of the walentaite group, as well as zirconolite-3O polytypes have the same type of intersecting kagomé nets of small cations.

Locations with GPS information