Hannayite Mineral Data

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)

Environment:

Rare druses on guano-derived phosphate mineral crusts in caves.

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

Skipton lava tube caves, 40 km southwest of Ballarat, Victoria, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for James Ballantine Hannay (1855-1931), Scottish chemist, University of Manchester, Manchester, England.

Name Pronunciation:

Hannayite + Pronunciation

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),

Forms:

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Forms: ( 1 3 3) ( 1 1 0) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Catti M , Franchini-Angela M , Acta Crystallographica, Section B , 32 (1976) p.2842-2848, Hydrogen bonding in the crystalline state. Structure of Mg3(NH4)2(HPO4)4*8H2O, (hannayite), and crystal-chemical relationships with schertelite and struvite, Locality: synthetic

Physical Properties of Hannayite

Cleavage:

{001} Perfect, {110} Indistinct, {110} Indistinct

Color:

Yellow.

Density:

2.03

Diaphaneity:

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= -0.239 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2672,KPDmeas= 0.2686,KC= 0.2157
Ncalc = 1.44

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:

Bulk Density (Electron Density)=2.11 gm/cc
note: Specific Gravity of Hannayite =2.04 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Hannayite= 1.26 barns/electron
U=PE_Hannayite x rElectron Density= 2.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hannayite is Not Radioactive

Hannayite Classification

Dana Class:

39.03.05.01 (39)Hydrated Acid Phosphates, etc

(39.03)with miscellaneous formulae

(39.03.05)Dana Group

39.03.05.01 Hannayite (NH4)2Mg3H4(PO4)4•8(H2O) P1 1

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

Strunz Class:

08.CH.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CH -With large and medium-sized cations, RO4:H2O < 1:1

08.CH.35 Hannayite (NH4)2Mg3H4(PO4)4•8(H2O) P1 1

Other Hannayite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Hannayite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Hannayite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Hannayite Specimen Label here :

Hannayite

(NH4)2Mg3H4(PO4)4•8(H2O)
Dana No: 39.03.05.01 Strunz No: 08.CH.35
Locality:

Notes: