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Phosphammite

Big Photo

Guañape Island, La Libertad Department, Peru
© 2008, J. Weissman

Formula:
(NH
 
4
)
 
2
HPO
 
4
System:MonoclinicColour:Colourless
Name:From the mineral's chemistry: a PHOSPHate of AMMonium
This page provides mineralogical data about Phosphammite.

Classification of Phosphammite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/A.12-30
Nickel-Strunz 10th (pending) edition ID:8.AD.20

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th edition ID:37.1.3.1
Dana 8th edition ID:37.1.3.1

37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
Hey's CIM Ref.:19.1.9

19 : Phosphates
1 : Phosphates of the alkali metals
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Type Occurrence of Phosphammite

Type Locality:Earles Find, Toppin Hill, Western Australia, Australia
Place of Conservation of Type Material:Western Australian Museum, Perth, Australia (neotype)
Geological Setting of type material:guano deposit

Occurrences of Phosphammite

Geological Setting:guano deposits

Physical Properties of Phosphammite

Diaphaneity (Transparency):Transparent
Colour:Colourless
Density (measured):1.61 g/cm3
Density (calculated):1.61 g/cm3

Crystallography of Phosphammite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b (P1 1 21/b) [P21/c] {P1 21/c 1} {P21/a}
Cell Parameters:a = 8.03Å, b = 6.68Å, c = 11.02Å
β = 113.38°
Ratio:a:b:c = 1.202 : 1 : 1.65
Unit Cell Volume:V 542.58 ų (Calculated from Unit Cell)
Z:4
Morphology:space group given as P21/a
X-Ray Powder Diffraction:
d-spacingIntensity
5.57 (75)
5.05 (100)
4.94 (65)
3.78 (50)
3.22 (65)
3.14 (45)
3.06 (45)
Comments:Synthetic (ICDD 29-0111)

Optical Data of Phosphammite

Type:Biaxial (+)
RI values: nα = 1.508 nβ = 1.518 nγ = 1.530
2V:Measured: 80° to 85°, Calculated: 85°
Maximum Birefringence:δ = 0.022

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Phosphammite

Formula:
(NH
 
4
)
 
2
HPO
 
4
Essential elements:H, N, O, P
All elements listed in formula:H, N, O, P

Relationship of Phosphammite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AD.05Nahpoite
Na
 
2
HPO
 
4
8.AD.10Monetite
CaHPO
 
4
8.AD.10Weilite
CaHAsO
 
4
8.AD.10Švenekite
Ca(H
 
2
AsO
 
4
)
 
2
8.AD.15Archerite
(K,NH
 
4
)[H
 
2
PO
 
4
]
8.AD.15Biphosphammite
(NH
 
4
,K)H
 
2
PO
 
4
8.AD.25Buchwaldite
NaCaPO
 
4
8.AD.30Schultenite
PbHAsO
 
4
8.AD.35Chernovite-(Y)
YAsO
 
4
8.AD.35Dreyerite
BiVO
 
4
8.AD.35Wakefieldite-(Ce)
(Ce,Pb)VO
 
4
8.AD.35Wakefieldite-(Y)
YVO
 
4
8.AD.35Xenotime-(Y)
YPO
 
4
8.AD.35Pretulite
ScPO
 
4
8.AD.35Xenotime-(Yb)
YbPO
 
4
8.AD.40Pucherite
BiVO
 
4
8.AD.45Ximengite
BiPO
 
4
8.AD.50Gasparite-(Ce)
(Ce,REE)AsO
 
4
8.AD.50Monazite-(Ce)
(Ce,La,Nd,Th)PO
 
4
8.AD.50Monazite-(La)
(La,Ce,Nd)PO
 
4
8.AD.50Monazite-(Nd)
(Nd,La,Ce)PO
 
4
8.AD.50Rooseveltite
BiAsO
 
4
8.AD.50Cheralite
(Ca,Ce)(Th,Ce)[PO
 
4
]
 
2
8.AD.50Monazite-(Sm)
(Sm,Gd,Ce,Th)(PO
 
4
)
8.AD.55Tetrarooseveltite
Bi(AsO
 
4
)
8.AD.60Chursinite
(Hg-Hg)
 
0.5
Hg
2+
 
[AsO
 
4
]
8.AD.65Clinobisvanite
BiVO
 
4
Related Minerals - Hey's Index Grouping:

- +
19.1.1Lithiophosphate
Li
 
3
[PO
 
4
]
19.1.2Olympite
Na
 
5
Li[PO
 
4
]
 
2
19.1.3Nahpoite
Na
 
2
HPO
 
4
19.1.4Dorfmanite
Na
 
2
(PO
 
3
OH)·2H
 
2
O
19.1.5Nalipoite
NaLi
 
2
[PO
 
4
]
19.1.6Stercorite
NaNH
 
4
HPO
 
4
·4H
 
2
O
19.1.7Archerite
(K,NH
 
4
)[H
 
2
PO
 
4
]
19.1.8Biphosphammite
(NH
 
4
,K)H
 
2
PO
 
4
19.1.10Lithiophilite
LiMn
2+
 
[PO
 
4
]
19.1.11Sicklerite
(LiMn
2+
 
,Fe
3+
 
)[PO
 
4
]
19.1.12Ferrisicklerite
(Fe
3+
 
,LiMn
2+
 
)[PO
 
4
]
19.1.13Triphylite
LiFe
2+
 
[PO
 
4
]
19.1.14Tavorite
LiFe
3+
 
[OH|PO
 
4
]
19.1.15Marićite
NaFe
2+
 
[PO
 
4
]

Other Names for Phosphammite

Synonyms:
Phosphammonite
Other Languages:
German:Phosphammit
Phosphammonit

Other Information

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

References for Phosphammite

Reference List:Bridge, P.J.: "Urea, a new mineral, and neotype phosphammite from Western Australia":Mineralogical Magazine (1973): 39: 346-348.

Smith, J.P., L.R.Lehr, & W.E. Brown: (1957): "Crystallographic properties of diammonium phosphate": Acta Cryst:10:709.

Articles/Blogs about Phosphammite

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    Localities for Phosphammite

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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Western Australia
      • Toppin Hill
    		Min.Mag.(1973) 39, 346-348
    Peru
     
    • La Libertad Department
    		Mineralogical Magazine (1973): 39, 346-348.
    Mineral and/or Locality
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