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Angastonite

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Penrice marble quarry, Angaston, Barossa Valley, South Mt Lofty Ranges, Mt Lofty Ranges, South Australia, Australia
© crocoite.com

Formula:
CaMgAl
 
2
(PO
 
4
)
 
2
(OH)
 
4
·7H
 
2
O
System:TriclinicColour:Snow white
Hardness:2
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.


Classification of Angastonite

IMA status:Approved 2008
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:42.7.22.

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

Type Locality:Penrice marble quarry, Angaston, Barossa Valley, South Mt Lofty Ranges, Mt Lofty Ranges, South Australia, Australia
General Appearance of Type Material:White
Place of Conservation of Type Material:Museum Victoria
Year of Discovery:1988
Associated Minerals at type locality:
Minyulite

Physical Properties of Angastonite

Lustre:Pearly
Colour:Snow white
Streak:White
Hardness (Mohs):2
Hardness Data:Estimated
Density (measured):2.47 g/cm3
Density (calculated):2.332 g/cm3

Crystallography of Angastonite

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

Optical Data of Angastonite

Type:Biaxial (+)
RI values: nα = 1.566(2) nβ = 1.572(2) nγ = 1.584(2)
2V:Measured: 70° (2), Calculated: 71°
Maximum Birefringence:δ = 0.018

Chart 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 Angastonite

Formula:
CaMgAl
 
2
(PO
 
4
)
 
2
(OH)
 
4
·7H
 
2
O
Essential elements:Al, Ca, H, Mg, O, P
All elements listed in formula:Al, Ca, H, Mg, O, P

Relationship of Angastonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DL.05Foggite
CaAl[(OH)
 
2
|PO
 
4
] · H
 
2
O
8.DL.10Cyrilovite
NaFe
3+
3
[(OH)
 
2
|PO
 
4
]
 
2
 · 2H
 
2
O
8.DL.10Millisite
(Na,K)CaAl
 
6
[(OH)
 
9
|(PO
 
4
)
 
4
] · 3H
 
2
O
8.DL.10Wardite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
 · 2H
 
2
O
8.DL.15Agardite-(Nd)
(Nd,La,Ce)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
8.DL.15Agardite-(Y)
(Y,Ca)Cu
 
6
[(OH)
 
6
|(AsO
 
4
,HAsO
 
4
)|(AsO
 
4
)
 
2
] · 3H
 
2
O
8.DL.15Agardite-(Ce)
CeCu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
8.DL.15Agardite-(La)
(La,Ce)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
8.DL.15Goudeyite
(Al,Y)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
8.DL.15Mixite
BiCu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
8.DL.15Petersite-(Y)
(Y,Ce,Nd)Cu
 
6
[(OH)
 
6
|(PO
 
4
)
 
3
] · 3H
 
2
O
8.DL.15Zálesíite
(Ca,Y)Cu
 
6
[(OH)
 
6
|(HAsO
 
4
,AsO
 
4
)|(AsO
 
4
)
 
2
] · 3H
 
2
O
8.DL.15Plumboagardite
(Pb,REE,Ca)Cu
 
6
[(OH)
 
6
|(HAsO
 
4
,AsO
 
4
)|(AsO
 
4
)
 
2
] · 3H
 
2
O
8.DL.15Calciopetersite
CaCu
 
6
[(OH)
 
6
|HPO
 
4
|(PO
 
4
)
 
2
] · 3H
 
2
O
8.DL.20Cheremnykhite
Pb
 
3
Zn
 
3
TeO
 
6
(VO
 
4
)
 
2
8.DL.20Dugganite
Pb
 
3
Zn
 
3
(Te
6+
 
O
 
6
)(AsO
 
4
)
 
2
8.DL.20Kuksite
Pb
 
3
Zn
 
3
TeO
 
6
(PO
 
4
)
 
2
8.DL.20Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
[(OH)
 
2
|AsO
 
4
]
 
2
 · 9H
 
2
O
8.DL.20Wallkilldellite-(Fe)
(Ca,Cu)
 
4
Fe
2+
6
[(OH,O)
 
2
|(AsO
 
4
,SiO
 
4
)]
 
4
 · 18H
 
2
O

Other Names for Angastonite

Synonyms:
IMA2008-008
Other Languages:

Other Information

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

References for Angastonite

Reference List: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(5), 1011–1020.

Internet Links for Angastonite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Angastonite in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
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  • rare and unusual minerals mainly crystallized
  • The Arkenstone - Fine Minerals
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  • Find Angastonite on www.crystalclassics.co.uk
  • Buy fine minerals and gemstones from Pala International
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    Localities for Angastonite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • South Australia
      • Mt Lofty Ranges
        • South Mt Lofty Ranges
          • Barossa Valley
            • Angaston
    		IMA website - Minerals approved in May 2008
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 21:42:19