Mundrabillaite Mineral Data

Mundrabillaite Mineral Data +

General Mundrabillaite Information

Chemical Formula:

(NH4)2Ca(HPO4)2·(H2O)

Composition:

Molecular Weight = 286.13 gm

Calcium 14.01 % Ca 19.60 % CaO

Phosphorus 21.65 % P 49.61 % P₂O₅

Hydrogen 2.82 % H - % Calc as (NH₄)₂O

Hydrogen 1.41 % H 12.59 % H₂O

Nitrogen 9.79 % N 18.20 % (NH₄)₂O

Oxygen 50.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)₂Ca(HPO₄)₂·(H₂O)

Environment:

Found with other salts in the cave floor.

IMA Status:

Approved IMA 1983

Locality:

Petrogale Cave near Mundrabilla Station, WA, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

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Mundrabillaite Crystallography

Axial Ratios:

a:b:c =1.056:1:0.7833

Cell Dimensions:

a = 8.643, b = 8.184, c = 6.411, Z = 2; beta = 98° V = 449.06 Den(Calc)= 2.12

Crystal System:

MonoclinicSpace Group: Pm,P 2,P 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.279(1), 3.106(0.6), 3.687(0.4),

Physical Properties of Mundrabillaite

Color:

Colorless.

Density:

2.05

Diaphaniety:

Transparent to Translucent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Mundrabillaite

Gladstone-Dale:

CI meas= -0.504 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.454 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2541,KPDmeas= 0.2628,KC= 0.1748

Optical Data:

Biaxial (-), a=1.521-1.522, b=1.542-1.544, g=1.551-1.552, bire=0.0300, 2V(Calc)=60-64, 2V(Meas)=65.

Calculated Properties of Mundrabillaite

Electron Density:

r_electron=2.19 gm/cc
note: r_{Mundrabillaite}=2.12 gm/cc.

Fermion Index

Fermion Index = 0.09797
Boson Index = 0.90203

Photoelectric:

PE_{Mundrabillaite}= 2.74 barns/electron
U=PE_{Mundrabillaite} x r_electron= 6.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mundrabillaite is Not Radioactive

Mundrabillaite Classification

Dana Class:

39.3.3.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.3)Dana Group

39.3.3.1 Mundrabillaite (NH4)2Ca(HPO4)2·(H2O) Pm,P 2,P 2/m Mono

Strunz Class:

VII/C.23-70 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.23 - Struvite - Mundrabillaite series

VII/C.23-10 Struvite (NH4)MgPO4·6(H2O) P mn2₁ mm2

VII/C.23-20 Dittmarite (NH4)Mg(PO4)·(H2O) P mn2₁ mm2

VII/C.23-30 Niahite (NH4)(Mn,Mg,Ca)PO4·(H2O) P mn2₁ mm2

VII/C.23-40 Hannayite (NH4)2Mg3H4(PO4)4·8(H2O) P1 1

VII/C.23-50 Schertelite (NH4)2MgH2(PO4)2·4(H2O) P bca 2/m 2/m 2/m

VII/C.23-60 Stercorite H(NH4)Na(PO4)·4(H2O) P1 1

VII/C.23-65 Swaknoite (NH4)2Ca(HPO4)2·(H2O) Unk Ortho

VII/C.23-70 Mundrabillaite (NH4)2Ca(HPO4)2·(H2O) Pm,P 2,P 2/m Mono

Other Mundrabillaite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Mundrabillaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Mundrabillaite

(NH4)2Ca(HPO4)2·(H2O)
Dana No: 39.3.3.1 Strunz No: VII/C.23-70
Locality:

Notes: