Phosphammite Mineral Data

General Phosphammite Information

Chemical Formula:

(NH4)2HPO4

Composition:

Molecular Weight = 132.06 gm

Phosphorus 23.45 % P 53.74 % P₂O₅

Hydrogen 6.11 % H - % Calc as (NH₄)₂O

Hydrogen 0.76 % H 6.82 % H₂O

Nitrogen 21.21 % N 39.43 % (NH₄)₂O

Oxygen 48.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)₂(HPO₄)

Environment:

Probably a crystallization product of the liquid fraction of guano.

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

In Toppin Hill Cave, about 320 km northeast of Kalgoorlie, Western Australia. Link to MinDat.org Location Data.

Name Origin:

Named as a PHOSPHate of AMMonium.

Name Pronunciation:

Phosphammite + Pronunciation

Synonym:

ICSD 2799

PDF 29-111

Phosphammite Image

Images:

Phosphammite

Comments: Tan opaque granular phosphammite.
Location: Guanape Islands, La Libertad, Peru. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Phosphammite Crystallography

Axial Ratios:

a:b:c =1.6048:1:1.1959

Cell Dimensions:

a = 10.735, b = 6.689, c = 8, Z = 4; beta = 109.72° V = 540.76 Den(Calc)= 1.62

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 5.05(1), 5.57(0.75), 4.94(0.65),

Physical Properties of Phosphammite

Color:

Colorless.

Density:

1.33

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Phosphammite

Gladstone-Dale:

CI meas= -2.209 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -1.634 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3202,KPDmeas= 0.39,KC= 0.1215
Ncalc = 1.16 - 1.2

Optical Data:

Biaxial (+), a=1.508, b=1.518, g=1.53, bire=0.0220

Calculated Properties of Phosphammite

Electron Density:

Bulk Density (Electron Density)=1.72 gm/cc
note: Specific Gravity of Phosphammite =1.62 gm/cc.

Fermion Index:

Fermion Index = 0.21
Boson Index = 0.79

Photoelectric:

PE_Phosphammite= 1.18 barns/electron
U=PE_Phosphammite x rElectron Density= 2.02 barns/cc.

Radioactivity:

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

Phosphammite Classification

Dana Class:

37.01.03.01 (37)Anhydrous Acid Phosphates, etc

(37.01)with miscellaneous formulae

(37.01.03)Dana Group

37.01.03.01 Phosphammite (NH4)2HPO4 P 2₁/c 2/m

Strunz Class:

08.AD.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AD -With only large cations

08.AD.20 Phosphammite (NH4)2HPO4 P 2₁/c 2/m

Other Phosphammite 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 Phosphammite :
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

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

Phosphammite

(NH4)2HPO4
Dana No: 37.01.03.01 Strunz No: 08.AD.20
Locality:

Notes:

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