Aldermanite Mineral Data

Aldermanite Mineral Data +

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General Aldermanite Information

Chemical Formula:

Mg5Al12(PO4)8(OH)22·32(H2O)

Composition:

Molecular Weight = 2,155.72 gm

Magnesium 5.64 % Mg 9.35 % MgO

Aluminum 15.02 % Al 28.38 % Al₂O₃

Phosphorus 11.49 % P 26.34 % P₂O₅

Hydrogen 4.02 % H 35.93 % H₂O

Oxygen 63.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₅Al₁₂(PO₄)₈(OH)₂₂·32(H₂O)

Environment:

Moculata P deposit with fluellite.

IMA Status:

Approved IMA 1981

Locality:

Angaston, 60 km NE of Adelaide, Australia, SA, Link to MinDat.org Location Data.

Name Origin:

Named for Arthur Richard Alderman (1901-1980), Mineralogist and petrologist, University of Adelaide, SA, Australia.

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Aldermanite Crystallography

Axial Ratios:

a:b:c =1.8007:1:3.1932

Cell Dimensions:

a = 15, b = 8.33, c = 26.6, Z = 2; V = 3,323.67 Den(Calc)= 2.15

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 13.4(1), 7.98(0.8), 5.55(0.6),

Physical Properties of Aldermanite

Color:

Colorless.

Diaphaniety:

Transparent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Flakes - Flat, thin crystals or aggregates.

Hardness:

2 - Gypsum

Luster:

Pearly

Streak:

white

Optical Properties of Aldermanite

Gladstone-Dale:

CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2326,KC= 0.2478

Optical Data:

Biaxial (?), a=1.5

Calculated Properties of Aldermanite

Electron Density:

r_electron=2.21 gm/cc
note: r_Aldermanite=2.15 gm/cc.

Fermion Index

Fermion Index = 0.00594
Boson Index = 0.99406

Photoelectric:

PE_Aldermanite= 1.20 barns/electron
U=PE_Aldermanite x r_electron= 2.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aldermanite is Not Radioactive

Aldermanite Classification

Dana Class:

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

(42.13)Dana Type

(42.13.1)Dana Group

42.13.1.1 Aldermanite Mg5Al12(PO4)8(OH)22·32(H2O) Unk Ortho

Strunz Class:

VII/D.17-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.17 - Aldermanite series

VII/D.17-10 Aldermanite Mg5Al12(PO4)8(OH)22·32(H2O) Unk Ortho

Other Aldermanite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Aldermanite Specimen Label here :

Aldermanite

Mg5Al12(PO4)8(OH)22·32(H2O)
Dana No: 42.13.1.1 Strunz No: VII/D.17-10
Locality:

Notes: