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Angastonite

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George Fife Angas
Formula:
CaMgAl2(PO4)2(OH)4 · 7H2O
Colour:
Snow white
Lustre:
Pearly
Hardness:
2
Specific Gravity:
2.47
Crystal System:
Triclinic
Name:
The mineral is named for the town of Angaston, which is named after George Fife Angas (1789–1879), businessman and Member of Parliament of South Australia, who settled in the area in the 1850s.
Possibly related to Montgomeryite and Montgomeryite group minerals.




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Classification of AngastoniteHide

Approved
Approval Year:
2008
8.DL.25

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
42.7.22.

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O

Physical Properties of AngastoniteHide

Pearly
Colour:
Snow white
Streak:
White
Hardness:
Hardness Data:
Estimated
Density:
2.47 g/cm3 (Measured)    2.332 g/cm3 (Calculated)

Optical Data of AngastoniteHide

Type:
Biaxial (+)
RI values:
nα = 1.566(2) nβ = 1.572(2) nγ = 1.584(2)
2V:
Measured: 70° (2), Calculated: 71°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
No axial dispersion.
Pleochroism:
Weak
Comments:
X = colourless, Y = colourless to pale yellow, Z = colourless

Chemical Properties of AngastoniteHide

Formula:
CaMgAl2(PO4)2(OH)4 · 7H2O

Crystallography of AngastoniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 13.303(1) Å, b = 27.020(2) Å, c = 6.1070(7) Å
α = 89.64(1)°, β = 83.44(1)°, γ = 80.444(8)°
Ratio:
a:b:c = 0.492 : 1 : 0.226
Unit Cell V:
2150.5 ų
Z:
6
Morphology:
Platy crystals with the forms {010} (prominent), {101}, {101} and {100} (rare), and also occurs as replacements of an unknown pre-existing mineral.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
13.38 (100)
11.05 (25)
5.73 (23)
8.01 (21)
(

Type Occurrence of AngastoniteHide

General Appearance of Type Material:
White
Place of Conservation of Type Material:
Museum Victoria
Associated Minerals at Type Locality:

Synonyms of AngastoniteHide

Related Minerals - Nickel-Strunz GroupingHide

8.DL.05FoggiteCaAl(PO4)(OH)2 · H2OOrth.
8.DL.10CyriloviteNaFe3+3(PO4)2(OH)4 · 2H2OTet. 4 2 2 : P41 21 2
8.DL.10Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2OTet.
8.DL.10WarditeNaAl3(PO4)2(OH)4 · 2H2OTet. 4 2 2 : P41 21 2
8.DL.15Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Agardite-(Ce)CeCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2OHex. 6/m
8.DL.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2OHex.
8.DL.15MixiteBiCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Petersite-(Y)(Y,Ce,Nd)Cu6(PO4)3(OH)6 · 3H2OHex.
8.DL.15ZálesíiteCaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2OHex.
8.DL.15Plumboagardite(Pb,REE,Ca)Cu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15CalciopetersiteCaCu6(PO4)2(PO3OH)(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.20CheremnykhitePb3Zn3(VO4)2(TeO6)Orth.
8.DL.20DugganitePb3Zn3(AsO4)2(TeO6)Trig. 3 2 : P3 2 1
8.DL.20KuksitePb3Zn3(PO4)2(TeO6)Trig. 3 2 : P3 2 1
8.DL.20WallkilldelliteCa2Mn2+3(AsO4)2(OH)4 · 9H2OHex.
8.DL.20Wallkilldellite-(Fe)(Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2OHex.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AngastoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
IMA website - Proposals approved in May 2008
Mills, S. J., Groat, L. A., Wilson, S. A., Birch, W. D., Whitfield, P. S. & Raudsepp, M. (2008) Angastonite, CaMgAl2(PO4)2(OH)4·7H2O, a new phosphate mineral from Angaston, South Australia, Mineralogical Magazine, 72, 1011-1020.

Internet Links for AngastoniteHide

Localities for AngastoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • South Australia
    • Mt Lofty Ranges
      • North Mt Lofty Ranges
        • Barossa Valley
          • Angaston
IMA website - Minerals approved in May 2008; Mills, S. J., Groat, L. A., Wilson, S. A., Birch, W. D., Whitfield, P. S. & Raudsepp, M. (2008): Angastonite, CaMgAl2(PO4)2(OH) 4·7H2O, a new phosphate mineral from Angaston, South Australia, Mineralogical Magazine. 72 (5): 1011–1020
Mineral and/or Locality  
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