Vote for your favorite mineral in #MinCup26! - Erythrite vs. Skutterudite
Pretty pink and poisonous Erythrite is against its shiny silver and structurally-useful Skutterudite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Mundrabillaite

A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
02337340017271925266852.jpg
Mundrabillaite

Osh Region, Kyrgyzstan
02337340017271925266852.jpg
Mundrabillaite

Osh Region, Kyrgyzstan
02337340017271925266852.jpg
Mundrabillaite

Osh Region, Kyrgyzstan
Hide all sections | Show all sections

About MundrabillaiteHide

Formula:
(NH4)2Ca(PO3OH)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, Australia, the type locality.
Dimorph of:
Swaknoite
This page provides mineralogical data about Mundrabillaite.


Unique IdentifiersHide

Mindat ID:
2809
Long-form identifier:
mindat:1:1:2809:3

IMA Classification of MundrabillaiteHide

Classification of MundrabillaiteHide

Strunz-mindat (2026):
8.CJ.10

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
MbIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MundrabillaiteHide

Lustre:
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
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Moderate
Dispersion:
relatively weak
Optical Extinction:
extinction oblique, angle + 26(1)°

Chemistry of MundrabillaiteHide

Mindat Formula:
(NH4)2Ca(PO3OH)2 · H2O
Element Weights:
Element% weight
O50.325 %
P21.650 %
Ca14.007 %
N9.791 %
H4.227 %

Calculated from ideal end-member formula.
Elements listed:
Ca, H, N, O, P - search for minerals with similar chemistry

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 Å(30)
4.279 Å(100)
3.687 Å(40)
3.106 Å(60)
2.873 Å(30)
2.728 Å(20)
2.116 Å(15)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
52 : Guano- and urine-derived minerals<0.4

Type Occurrence of MundrabillaiteHide

Type Locality:
ⓘ Petrogale Cave, Madura Roadhouse, Dundas Shire, Western Australia, Australia
General Appearance of Type Material:
Tiny crystals
Place of Conservation of Type Material:
Western Australian Museum, Perth, MDC5902.
Geological Setting of Type Material:
Cave with bat guano, at 20.5 °C and 68.5% relative humidity
Associated Minerals at Type Locality:
ArcheriteBiphosphammiteAphthitaliteHaliteSyngenite
StercoriteOxammiteWeddelliteWhitlockiteGuanine
NewberyiteCalcite
Reference:
Bridge, P. J., Clarke, R. M. (1983) Mundrabillaite—A new cave mineral from Western Australia. Mineralogical Magazine, 47 (342) 80-81 doi:10.1180/minmag.1983.047.342.15

Synonyms of MundrabillaiteHide

Other Language Names for MundrabillaiteHide

Related Minerals - Strunz-mindat GroupingHide

8.CJ.AirditeSr(V4+O)2(PO4)2 · 4H2OMon. m : Bb
8.CJ.DobšináiteCa2Ca(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CJ.SainfelditeCa5(AsO4)2(AsO3OH)2 · 4H2OMon. 2/m : B2/b
8.CJ.CaesiumpharmacosideriteCsFe3+4[(AsO4)3(OH)4] · 4H2OIso. 43m : P43m
8.CJ.JeankempiteCa5(AsO4)2(HAsO4)2 · 7H2OTric. 1 : P1
8.CJ.05Stercorite(NH4)Na(PO3OH) · 4H2OTric. 1 : P1
8.CJ.10Swaknoite(NH4)2Ca(PO3OH)2 · H2OOrth.
8.CJ.15NabaphiteNaBaPO4 · 9H2OIso. 23 : P213
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2OIso. 23 : P213
8.CJ.20HaidingeriteCaHAsO4 · H2OOrth. mmm(2/m2/m2/m) : Pbcn
8.CJ.25Rhabdophane-(Y)YPO4 · H2OHex. 622 : P6222
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2OMon. 2/m : P21/b
8.CJ.27'Churchite-(Dy)'(Dy,Sm,Gd,Nd)PO4 · 2H2OMon.
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CJ.35FulbrightiteCa(V4+O)2(As5+O4)2 · 4H2OTric. 1 : P1
8.CJ.35Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OTrig. 3m : R3c
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2OTric. 1 : P1
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2OTric.
8.CJ.45Brockite(Ca,Th,Ce)PO4 · H2OHex. 622 : P6222
8.CJ.45Smirnovskite(Th,Ca)PO4 · nH2OHex. 622 : P6222
8.CJ.45Rhabdophane-(Ce)Ce(PO4) · 0.6H2OTrig. 32 : P3121
8.CJ.45Rhabdophane-(La)La(PO4) · H2OHex. 622 : P6222
8.CJ.45Rhabdophane-(Nd)Nd(PO4) · H2OHex. 622 : P6222
8.CJ.45Tristramite(Ca,U4+,Fe3+)(PO4,SO4) · 2H2OHex. 622 : P6222
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2OHex. 622 : P6222
8.CJ.45ŠtěpiteU(AsO3OH)2 · 4H2O Tet. 4/mmm(4/m2/m2/m) : I41/acd
8.CJ.47VysokýiteU4+[AsO2(OH)2]4 · 4H2OTric. 1 : P1
8.CJ.50Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
8.CJ.50BrushiteCa(PO3OH) · 2H2OMon. m : Bb
8.CJ.50ArdealiteCa2(PO3OH)(SO4) · 4H2OMon. m : Bb
8.CJ.50PharmacoliteCa(HAsO4) · 2H2OMon. m
8.CJ.50'Churchite-(Nd)'Nd(PO4) · 2H2OMon.
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2OTric.
8.CJ.60DorfmaniteNa2(PO3OH) · 2H2OOrth. mmm(2/m2/m2/m) : Pbca
8.CJ.65SincositeCa(V4+O)2(PO4)2 · 4H2OTet. 4/mmm(4/m2/m2/m) : P42/nnm
8.CJ.65BariosincositeBa(V4+O)2(PO4)2 · 4H2OTet.
8.CJ.70CatalanoiteNa2(PO3OH) · 8H2OOrth. mmm(2/m2/m2/m) : Ibca
8.CJ.75GuériniteCa6(HAsO4)3(AsO4)2 · 10.5H2OMon. 2/m : P21/b
8.CJ.85Ningyoite(U,Ca,Ce)2(PO4)2 · 1-2H2OOrth.

Other InformationHide

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

Internet Links for MundrabillaiteHide

References for MundrabillaiteHide

Localities for MundrabillaiteHide

Showing 3 localities.

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.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • Western Australia
    • Dundas Shire
      • Madura Roadhouse
Bridge et al. (1983)
Kyrgyzstan
 
Steffen Möckel EDS analysis (2005)
Namibia
 
  • Khomas Region
    • Windhoek Rural
Martini (1992)
Quick NavTopAbout MundrabillaiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 2, 2026 04:30:28 Page updated: August 19, 2026 07:53:37
Go to top of page