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Mundrabillaite

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Formula:
(NH4)2Ca(HPO4)2 · H2O
Colour:
Colourless
Lustre:
Earthy
Hardness:
1 - 2
Specific Gravity:
2.05
Crystal System:
Monoclinic
Name:
Named for the nearby pastoral lease, Mundrabilla Station
Dimorph of:
This page provides mineralogical data about Mundrabillaite.


Hide all sections | Show all sections

Classification of MundrabillaiteHide

Approved
8.CJ.10

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

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
3 : Miscellaneous
19.4.7

19 : Phosphates
4 : Phosphates of Ca

Physical Properties of MundrabillaiteHide

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

Optical Data of MundrabillaiteHide

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°
Max Birefringence:
δ = 0.030
Image 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 MundrabillaiteHide

Formula:
(NH4)2Ca(HPO4)2 · H2O
IMA Formula:
(NH4)2Ca(PO3OH)2 · H2O

Crystallography of MundrabillaiteHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Pm
Cell Parameters:
a = 8.643 Å, b = 8.184 Å, c = 6.411 Å
β = 98°
Ratio:
a:b:c = 1.056 : 1 : 0.783
Unit Cell V:
449.06 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.60 (3)
4.279 (10)
3.687 (4)
3.106 (6)
2.873 (3)
2.728 (2)
2.116 (1.5)

Type Occurrence of MundrabillaiteHide

Synonyms of MundrabillaiteHide

Other Language Names for MundrabillaiteHide

Related Minerals - Nickel-Strunz GroupingHide

8.CJ.CaesiumpharmacosideriteCsFe4[(AsO4)3(OH)4]·4H2OIso. 4 3m : P4 3m
8.CJ.05StercoriteNa(NH4)HPO4 · 4H2OTric.
8.CJ.10Swaknoite(NH4)2Ca(HPO4)2 · H2OOrth.
8.CJ.15NabaphiteNaBaPO4 · 9H2OIso.
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2O
8.CJ.20HaidingeriteCaHAsO4 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2OMon. 2/m : P21/b
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CJ.35Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OHex.
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2OTric.
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2OTric. 1 : P1
8.CJ.45Brockite(Ca,Th,Ce)PO4 · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Ce)Ce(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(La)La(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Nd)Nd(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
8.CJ.45Smirnovskite(Th,Ca)PO4 · nH2OHex. 6 2 2 : P62 2 2
8.CJ.50ArdealiteCa2(HPO4)(SO4) · 4H2OMon. m : Bb
8.CJ.50BrushiteCa(HPO4) · 2H2OMon. m : Bb
8.CJ.50Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
8.CJ.50PharmacoliteCa(HAsO4) · 2H2OMon. m
8.CJ.50Churchite-(Nd)Nd(PO4) · 2H2OMon.
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2OTric.
8.CJ.60DorfmaniteNa2HPO4 · 2H2OOrth.
8.CJ.65SincositeCa(VO)2(PO4)2 · 5H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
8.CJ.65BariosincositeBa(VO)2(PO4)2 · 4H2OTet.
8.CJ.70CatalanoiteNa2(HPO4) · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca
8.CJ.75GuériniteCa5(AsO4)2(HAsO4)2 · 9H2OMon. 2/m : P21/b
8.CJ.85NingyoiteCaU(PO4)2 · 1-2H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.4.1MonetiteCa(HPO4)Tric. 1
19.4.2HydroxylapatiteCa5(PO4)3(OH)Hex. 6/m : P63/m
19.4.3BrushiteCa(HPO4) · 2H2OMon. m : Bb
19.4.4IsoclasiteCa2(PO4)(OH) · 2H2OMon.
19.4.5BuchwalditeNaCa(PO4)Orth. mm2 : Pmn21
19.4.6CanaphiteNa2Ca(P2O7) · 4H2OMon.
19.4.8WhitlockiteCa9Mg(PO4)6(HPO4)Trig. 3m : R3c
19.4.9BrianiteNa2CaMg(PO4)2Mon. 2/m : P21/b
19.4.10Petersite-(Y)(Y,Ce,Nd)Cu6(PO4)3(OH)6 · 3H2OHex.

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 MundrabillaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Magazine: 47 (1983), 80-81. [abstracted in American Mineralogist, 69 (1984), 407]

Internet Links for MundrabillaiteHide

Localities for MundrabillaiteHide

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)
 
  • Western Australia
    • Dundas Shire
      • Madura Roadhouse
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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