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Mundrabillaite

Formula:
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
·H
 
2
O
System:MonoclinicColour:Colourless
Hardness:1 - 2
Name:Named for the nearby pastoral lease, Mundrabilla Station
Dimorph of:Swaknoite
This page provides mineralogical data about Mundrabillaite.

Classification of Mundrabillaite

IMA status:Approved
Strunz 8th edition ID:7/C.23-70
Strunz 9th edition ID:8.CJ.10
Nickel-Strunz 10th (pending) edition ID:8.CJ.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
Dana 8th edition ID:39.3.3.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
3 : Miscellaneous
Hey's CIM Ref.:19.4.7

19 : Phosphates
4 : Phosphates of Ca
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Type Occurrence of Mundrabillaite

Type Locality:Petrogale Cave, Madura Motel, Eucla, Western Australia, Australia
Year of Discovery:1977

Physical Properties of Mundrabillaite

Lustre:Earthy
Colour:Colourless
Streak:white
Hardness (Mohs):1 - 2
Tenacity:Fragile
Density (measured):2.05 g/cm3
Density (calculated):2.09 g/cm3
Comment:measured on synthetic material

Crystallography of Mundrabillaite

Crystal System:Monoclinic
Class (H-M):m - Domatic
Space Group:Pm (P1 1m) [Pm] {P1m1}
Cell Parameters:a = 8.643Å, b = 8.184Å, c = 6.411Å
β = 98°
Ratio:a:b:c = 1.056 : 1 : 0.783
Unit Cell Volume:V 449.06 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
8.60 (3)
4.279 (10)
3.687 (4)
3.106 (6)
2.873 (3)
2.728 (2)

Optical Data of Mundrabillaite

Type:Biaxial (-)
RI values: nα = 1.521 - 1.522 nβ = 1.542 - 1.544 nγ = 1.551 - 1.552
2V:Measured: 65° , Calculated: 60° to 64°
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:relatively weak

Chemical Properties of Mundrabillaite

Formula:
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
·H
 
2
O
Essential elements:Ca, H, N, O, P
All elements listed in formula:Ca, H, N, O, P

Relationship of Mundrabillaite to other Species

Related Minerals - Nickel-Strunz Grouping):
8.CJ.05Stercorite
NaNH
 
4
HPO
 
4
·4H
 
2
O
8.CJ.10Swaknoite
(NH
 
4
)
 
2
Ca[HPO
 
4
]
 
2
 · H
 
2
O
8.CJ.15Nabaphite
NaBaPO
 
4
·9H
 
2
O
8.CJ.15Nastrophite
Na(Sr,Ba)PO
 
4
·9H
 
2
O
8.CJ.20Haidingerite
Ca[HAsO
 
4
] · H
 
2
O
8.CJ.25Vladimirite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 5H
 
2
O
8.CJ.30Ferrarisite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 9H
 
2
O
8.CJ.30Guérinite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 9H
 
2
O
8.CJ.35Machatschkiite
(Ca,Na)
 
6
AsO
 
4
(AsO
 
3
OH)
 
3
(PO
 
4
,SO
 
4
)·15H
 
2
O
8.CJ.40Phaunouxite
Ca
 
3
[AsO
 
4
]
 
2
 · 11H
 
2
O
8.CJ.40Rauenthalite
Ca
 
3
[AsO
 
4
]
 
2
 · 10H
 
2
O
8.CJ.45Brockite
(Ca,Th,Ce)(PO
 
4
)·H
 
2
O
8.CJ.45Grayite
(Th,Pb,Ca)PO
 
4
·H
 
2
O
8.CJ.45Ningyoite
CaU(PO
 
4
)
 
2
·1-2H
 
2
O
8.CJ.45Rhabdophane-(Ce)
(Ce,La)PO
 
4
·H
 
2
O
8.CJ.45Rhabdophane-(La)
(La,Ce)PO
 
4
·H
 
2
O
8.CJ.45Rhabdophane-(Nd)
(Nd,Ce,La)PO
 
4
·H
 
2
O
8.CJ.45Tristramite
(Ca,U,Fe)(PO
 
4
,SO
 
4
)·2H
 
2
O
8.CJ.45Smirnovskite
(Th,Ca)PO
 
4
 ·nH
 
2
O
8.CJ.50Ardealite
Ca
 
2
[HPO
 
4
|SO
 
4
] · 4H
 
2
O
8.CJ.50Brushite
CaHPO
 
4
·2H
 
2
O
8.CJ.50Churchite-(Y)
YPO
 
4
·2H
 
2
O
8.CJ.50Pharmacolite
CaHAsO
 
4
·2H
 
2
O
8.CJ.50Churchite-(Nd)
NdPO
 
4
·2H
 
2
O
8.CJ.55Mcnearite
NaCa
 
5
[(HAsO
 
4
)
 
4
|AsO
 
4
] · 4H
 
2
O
8.CJ.60Dorfmanite
Na
 
2
(PO
 
3
OH)·2H
 
2
O
8.CJ.65Sincosite
CaV
 
2
(PO
 
4
)
 
2
O
 
2
·5H
 
2
O
8.CJ.65Bariosincosite
Ba(V
4+
 
O)
 
2
(PO
 
4
)
 
2
·4H
 
2
O
8.CJ.70Catalanoite
Na
 
2
[HPO
 
4
] · 8H
 
2
O
Related Minerals - Hey's Index Grouping:
19.4.1Monetite
CaHPO
 
4
19.4.2Apatite-(CaOH)
Ca
 
5
[OH|(PO
 
4
)
 
3
]
19.4.3Brushite
CaHPO
 
4
·2H
 
2
O
19.4.4Isoclasite
Ca
 
2
[OH|PO
 
4
] · 2H
 
2
O
19.4.5Buchwaldite
NaCaPO
 
4
19.4.6Canaphite
CaNa
 
2
[HPO
 
4
]
 
2
 · 3H
 
2
O
19.4.8Whitlockite
Ca
 
9
Mg[PO
 
3
OH][PO
 
4
]
 
6
19.4.9Brianite
Na
 
2
CaMg[PO
 
4
]
 
2
19.4.10Petersite-(Y)
(Y,Ce,Nd)Cu
 
6
[(OH)
 
6
|(PO
 
4
)
 
3
] · 3H
 
2
O

Other Names for Mundrabillaite

Synonyms:
IMA1978-058
German names:
Mundrabillait
Spanish names:
Mundrabillaita

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 Mundrabillaite

Reference List:Mineralogical Magazine: 47 (1983), 80-81. [abstracted in American Mineralogist, 69 (1984), 407]

Internet Links for Mundrabillaite

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    Localities for Mundrabillaite

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    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.
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    (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
     
    • Western Australia
      • Eucla
        • Madura Motel
    		Mineralogical Magazine (1983): 47, 80-81.
    Namibia
     
    • Khomas Region
      • Windhoek District
    		Martini, J.E.J. (1992) Swaknoite [Ca(NH4)2·(HPO4)2·H2O, orthorhombic]: A new mineral from Arnhem cave, Namibia. Bulletin of the South African Speleological Association: 32: 72-74.
    Mineral and/or Locality
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