Aldermanite
A valid IMA mineral species
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About Aldermanite
Arthur R. Alderman
Formula:
[Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6] · H2O
formerly given as Mg5Al12(PO4)8(OH)22·32H2O (redefined in 2021)
Colour:
Colorless in transmitted light
Lustre:
Sub-Vitreous, Pearly
Hardness:
2
Specific Gravity:
2.1 (Calculated)
Crystal System:
Monoclinic
Name:
Named by Ian R. Harrowfield, Edgar Ralph Segnit, and John. A. Watts in 1981 in honor of Arthur Richard Alderman (1901–1980), Professor of Geology and Mineralogy, University of Adelaide, Adelaide, Australia.
Structurally to some extent related to walentaite group and zirconolite-3O. The relation is due to similar, intersecting, kagomé nets.
The OH analogue of penriceite.
In aldermanite the pyrochlore-like 6-membered rings of corner-sharing octahedra, VIIINa-centred, bear intersecting kagomé nets of Al atoms.
Al in Al-centred octahedra (cis- and trans-corner-connected) forms sawtooth-like layers. The layers are hold together by interlayer Mg(H2O)6 octahedra and water molecules.
The OH analogue of penriceite.
In aldermanite the pyrochlore-like 6-membered rings of corner-sharing octahedra, VIIINa-centred, bear intersecting kagomé nets of Al atoms.
Al in Al-centred octahedra (cis- and trans-corner-connected) forms sawtooth-like layers. The layers are hold together by interlayer Mg(H2O)6 octahedra and water molecules.
Unique Identifiers
Mindat ID:
104
Long-form identifier:
mindat:1:1:104:1
IMA Classification of Aldermanite
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
[Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH)6]·H2O
Approval year:
1980
First published:
1981
Approval history:
Redefined due to acceptance of the proposal 20-I (Newsletter #60)
Classification of Aldermanite
8.DM.35
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
M : With large and medium-sized cations, (OH, etc.):RO4 > 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
M : With large and medium-sized cations, (OH, etc.):RO4 > 2:1
42.13.1.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
19.8.10
19 : Phosphates
8 : Phosphates of Al and other metals
19 : Phosphates
8 : Phosphates of Al and other metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Adm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Aldermanite
Sub-Vitreous, Pearly
Transparency:
Transparent, Translucent
Colour:
Colorless in transmitted light
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
2.1 g/cm3 (Calculated)
Optical Data of Aldermanite
Type:
Biaxial
RI values:
n = 1.500
Surface Relief:
Moderate (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Dispersion:
relatively weak
Pleochroism:
Non-pleochroic
Chemistry of Aldermanite
Mindat Formula:
[Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6] · H2O
formerly given as Mg5Al12(PO4)8(OH)22·32H2O (redefined in 2021)
formerly given as Mg5Al12(PO4)8(OH)22·32H2O (redefined in 2021)
Element Weights:
Crystallography of Aldermanite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 13.524(3) Å, b = 9.958(2) Å, c = 7.013(1) Å
β = 97.40(3)°
β = 97.40(3)°
Ratio:
a:b:c = 1.358 : 1 : 0.704
Unit Cell V:
936.59 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Frequently in talc-like flakes and aggregates, to 0.1 mm.; also in clusters of transparent platy crystals.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 13.40 Å | (100) |
| 7.98 Å | (80) |
| 5.70 Å | (30) |
| 5.55 Å | (60) |
| 4.96 Å | (30) |
| 2.841 Å | (50) |
| 2.660 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Aldermanite
General Appearance of Type Material:
Minute talc-like flakes, thinly coating cracks and cavities. The crystals are generally less than 0.1 mm across and only about 0.1-0.2 um thick.
Place of Conservation of Type Material:
C.S.I.R.O. Division of Mineral Chemistry, Melbourne, M636; Museum Victoria, Melbourne, Australia, M34778.
Geological Setting of Type Material:
As a secondary mineral in cavities in a brecciated metamorphosed sedimentary phosphate deposit, formed by the alteration of fluellite .
Associated Minerals at Type Locality:
Synonyms of Aldermanite
Other Language Names for Aldermanite
Dutch:Aldermaniet
French:Aldermanite
German:Aldermanit
Norwegian:Aldermanitt
Simplified Chinese:直水磷镁石
Spanish:Aldermanita
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.DM. | Tomsquarryite | NaMgAl3(PO4)2(OH)6 · 8H2O |
| 8.DM. | Elliottite | NaMgAl3(PO4)2F6 · 9H2O |
| 8.DM. | Betpakdalite-FeFe | [Fe3+2 (H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3O37] |
| 8.DM. | Penriceite | [Mg(H2O)6][Na(H2O)2Al3(PO4)2F6] · H2O |
| 8.DM. | Betpakdalite-CaMg | [Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)] |
| 8.DM. | Chinnerite | [Mg(H2O)6]Na(H2O)2Al3(PO4)2F6 |
| 8.DM. | Sarrochite | [Ca4(H2O)38][Mo8P2Fe3+3O37(OH)] |
| 8.DM.05 | Esperanzaite | NaCa2Al2(AsO4)2(OH)F4 · 2H2O |
| 8.DM.05 | Morinite | NaCa2Al2(PO4)2(OH)F4 · 2H2O |
| 8.DM.10 | Alexshubnikovite | Ca2Cu9(AsO4)4(OH)9Cl(H2O)8 · 2H2O |
| 8.DM.10 | Tangdanite | Ca2Cu9(AsO4)4(SO4)0.5(OH)9 · 9H2O |
| 8.DM.10 | Tyrolite | Ca2Cu9(AsO4)4(CO3)(OH)8 · 11H2O |
| 8.DM.15 | Melkovite | [Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)] |
| 8.DM.15 | Betpakdalite-NaCa | [Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3] |
| 8.DM.15 | Betpakdalite-CaCa | [Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)] |
| 8.DM.20 | Phosphovanadylite-Ba | Ba[V4+4P2O8(OH)8] · 12H2O |
| 8.DM.20 | Phosphovanadylite-Ca | Ca[V4+4P2O12(OH)4] · 12H2O |
| 8.DM.25 | Yukonite | Ca3Fe3+(AsO4)2(OH)3 · 5H2O |
| 8.DM.30 | Uduminelite | Ca3Al8(PO4)2O12 · 2H2O |
| 8.DM.35 | 'Azovskite' | Fe3+3(PO4)(OH)6 or near |
| 8.DM.35 | Delvauxite | CaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed |
| 8.DM.40 | Santafeite | (Na,Ca,Sr)12(Mn2+,Fe3+,Al,Mg)8Mn4+8(VO4)16(OH,O)20 · 8H2O |
| 8.DM.55 | Tapiaite | Ca5Al2(AsO4)4(OH)4 · 12H2O |
| 8.DM.60 | Alcantarillaite | [Fe3+0.5(H2O)4][CaAs3+2(Fe3+2.5W6+0.5)(AsO4)2O7] |
Fluorescence of Aldermanite
Not fluorescent.
Other Information
Notes:
Soluble in mineral acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Aldermanite
mindat.org URL:
https://www.mindat.org/min-104.html
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Please feel free to link to this page.
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References for Aldermanite
Reference List:
Localities for Aldermanite
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia (TL) | |
| Segnit et al. (1981) +2 other references |
| S. Mills (in prep) | |
| www.excaliburmineral.com/mina-c.htm |
| |
| Francis et al. (2012) |
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Tom's Quarry, Koonunga, Light Regional Council, South Australia, Australia