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.

Name Pronunciation:

Aldermanite + Pronunciation

Aldermanite Image

Images:

Aldermanite Minyulite

Comments: White, blocky aldermanite crystals to 2mm completely covering one face of matrix with colorless prismatic Minyulite crystals in sprays to 3mm.
Location: Tom's Phosphate quarry, Kapunda, South Australia, Australia. Scale: Overall: 2 x 1.5 x 2 cm.
© Tom Loomis / Dakota Matrix

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.

Diaphaneity:

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
Ncalc = 1.53

Optical Data:

Biaxial (?), a=1.5

Calculated Properties of Aldermanite

Electron Density:

Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Aldermanite =2.15 gm/cc.

Fermion Index:

Fermion Index = 0.0059497194
Boson Index = 0.9940502806

Photoelectric:

PE_Aldermanite= 1.20 barns/electron
U=PE_Aldermanite x rElectron Density= 2.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aldermanite is Not Radioactive

Aldermanite Classification

Dana Class:

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

(42.13)Dana Type

(42.13.01)Dana Group

42.13.01.01 Aldermanite Mg5Al12(PO4)8(OH)22•32(H2O) Unk Ortho

Strunz Class:

08.DE.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DE -With only medium-sized cations, (OH, etc.):RO4 = 3:1

08.DE.35 Aldermanite Mg5Al12(PO4)8(OH)22•32(H2O) Unk Ortho

08.DE.35 Alumoakermanite! (Ca,Na)2(Al,Mg,Fe)(Si2O7) P 42₁m 4 2m

Other Aldermanite Information

References:

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

See Also:

Links to other databases for Aldermanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Aldermanite here :
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Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Aldermanite

Mg5Al12(PO4)8(OH)22•32(H2O)
Dana No: 42.13.01.01 Strunz No: 08.DE.35
Locality:

Notes: