Hannayite Mineral Data

Hannayite Mineral Data +

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General Hannayite Information

Chemical Formula:

(NH4)2Mg3H4(PO4)4·8(H2O)

Composition:

Molecular Weight = 637.03 gm

Magnesium 11.45 % Mg 18.98 % MgO

Phosphorus 19.45 % P 44.56 % P₂O₅

Hydrogen 1.27 % H - % Calc as (NH₄)₂O

Hydrogen 3.16 % H 28.28 % H₂O

Nitrogen 4.40 % N 8.17 % (NH₄)₂O

Oxygen 60.28 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)₂Mg₃H₄(PO₄)₄·8(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 623

PDF 16-361

Hannayite Image

Images:

Hannayite Newberyite

Comments: Translucent white prismatic crystals of hannayite on brown newberyite.
Location: Skipton Caves, Victoria, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hannayite Crystallography

Axial Ratios:

a:b:c =0.6689:1:0.5821

Cell Dimensions:

a = 7.7, b = 11.51, c = 6.7, Z = 1; alpha = 76°, beta = 99.8°, gamma = 115.8° V = 511.16 Den(Calc)= 2.07

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 6.96(1), 3.46(0.75), 5.15(0.3),

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Forms: [ 1 3 3] [ 1 1 0] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Physical Properties of Hannayite

Cleavage:

[001] Perfect, [110] Indistinct, [110] Indistinct

Color:

Yellow.

Density:

2.03

Diaphaniety:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hannayite

Gladstone-Dale:

CI meas= -0.245 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.221 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2634,KPDmeas= 0.2686,KC= 0.2157

Optical Data:

Biaxial (-), a=1.504-1.555, b=1.522-1.572, g=1.539-1.579, bire=0.0240-0.0350, 2V(Calc)=64-86, 2V(Meas)=45-90.

Calculated Properties of Hannayite

Electron Density:

r_electron=2.14 gm/cc
note: r_Hannayite=2.07 gm/cc.

Fermion Index

Fermion Index = 0.05555
Boson Index = 0.94445

Photoelectric:

PE_Hannayite= 1.26 barns/electron
U=PE_Hannayite x r_electron= 2.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hannayite is Not Radioactive

Hannayite Classification

Dana Class:

39.3.5.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.5)Dana Group

39.3.5.1 Hannayite (NH4)2Mg3H4(PO4)4·8(H2O) P1 1

39.3.5.2 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8·13(H2O) R 3c or R 3c Trig

Strunz Class:

VII/C.23-40 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 Hannayite Information

References:

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

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Print or Cut-and-Paste your Hannayite Specimen Label here :

Hannayite

(NH4)2Mg3H4(PO4)4·8(H2O)
Dana No: 39.3.5.1 Strunz No: VII/C.23-40
Locality:

Notes: