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Biphosphammite

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Formula:
(NH4,K)(H2PO4)
Colour:
White, pale yellow or colorless; colorless in transmitted light.
Lustre:
Waxy, Dull, Earthy
Hardness:
1 - 2
Specific Gravity:
2.04
Crystal System:
Tetragonal
Name:
Named in 1870 by Charles Upham Shepard for the chemical composition containing phosphate and ammonium.
Isostructural with:
This page provides mineralogical data about Biphosphammite.


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Classification of BiphosphammiteHide

Approved, 'Grandfathered' (first described prior to 1959)
8.AD.15

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th ed.:
37.1.4.1
37.1.4.1

37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
19.1.8

19 : Phosphates
1 : Phosphates of the alkali metals

Physical Properties of BiphosphammiteHide

Waxy, Dull, Earthy
Transparency:
Translucent
Comment:
Due to fine-grained material
Colour:
White, pale yellow or colorless; colorless in transmitted light.
Streak:
White
Hardness:
1 - 2 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.04 g/cm3 (Measured)    1.99 g/cm3 (Calculated)
Comment:
Also calculated = 1.80

Optical Data of BiphosphammiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.525 nε = 1.480
Birefringence:
0.045
Max Birefringence:
δ = 0.045
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Optical Extinction:
parallel
Pleochroism:
Non-pleochroic

Chemical Properties of BiphosphammiteHide

Formula:
(NH4,K)(H2PO4)
IMA Formula:
(NH4,K)H2PO4

Crystallography of BiphosphammiteHide

Crystal System:
Tetragonal
Class (H-M):
4 2 2 - Trapezohedral
Space Group:
I41 2 2
Setting:
I41 2 2
Cell Parameters:
a = 7.494 Å, c = 7.340 Å
Ratio:
a:c = 1 : 0.979
Unit Cell V:
412.21 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Fine-grained granular crust.
Comment:
AC B 29:2721 (1973); Also a 7.502, c 7.554

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.32 (100)
3.75 (60)
3.08 (90)
3.07 (90)
2.66 (20)
2.65 (20)
2.02 (40)
2.01 (40)
Comments:
ICDD 37-1479; also 6-125, 29-74.

Type Occurrence of BiphosphammiteHide

Other Language Names for BiphosphammiteHide

Common AssociatesHide

Ammonium-AphthitaliteNa(K,NH4)SO4
Phosphammite(NH4)2(HPO4)
UreaCO(NH2)2
WeddelliteCa(C2O4) · (2.5-x)H2O
Associated Minerals Based on Photo Data:
Archerite2 photos of Biphosphammite associated with Archerite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.AD.05NahpoiteNa2HPO4Mon. 2/m : P21/m
8.AD.10MonetiteCa(HPO4)Tric. 1
8.AD.10WeiliteCa(HAsO4)Tric. 1 : P1
8.AD.10ŠvenekiteCa(H2AsO4)2Tric. 1 : P1
8.AD.15Archerite(K,NH4)(H2PO4)Tet. 4 2m : I4 2d
8.AD.20Phosphammite(NH4)2(HPO4)Mon. 2/m : P21/b
8.AD.25BuchwalditeNaCa(PO4)Orth. mm2 : Pmn21
8.AD.30SchultenitePb(HAsO4)Mon. 2/m : P2/b
8.AD.35Chernovite-(Y)Y(AsO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35DreyeriteBi(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35Wakefieldite-(Ce)Ce(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35Wakefieldite-(Y)Y(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35Xenotime-(Y)Y(PO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35PretuliteSc(PO4)Tet.
8.AD.35Xenotime-(Yb)Yb(PO4)Tet.
8.AD.35Wakefieldite-(La)La(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.40PucheriteBi(VO4)Orth. mmm (2/m 2/m 2/m)
8.AD.45XimengiteBi(PO4)Trig.
8.AD.50Gasparite-(Ce)Ce(AsO4)
8.AD.50Monazite-(Ce)Ce(PO4)Mon. 2/m : P21/b
8.AD.50Monazite-(La)La(PO4)
8.AD.50Monazite-(Nd)Nd(PO4)
8.AD.50RooseveltiteBi(AsO4)Mon. 2/m
8.AD.50CheraliteCaTh(PO4)2Mon. 2/m
8.AD.50Monazite-(Sm)Sm(PO4)Mon. 2/m : P21/m
8.AD.50UM2005-35-VO:CaFePSiTh(Th,Ca)(VO4,SiO4,PO4)
8.AD.55TetrarooseveltiteBi(AsO4)Tet.
8.AD.60Chursinite(Hg+2)0.5Hg2+(AsO4)Mon. 2/m : P21/b
8.AD.65ClinobisvaniteBi(VO4)Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

37.1.4.2Archerite(K,NH4)(H2PO4)Tet. 4 2m : I4 2d

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.1.1LithiophosphateLi3PO4Orth. mm2 : Pmn21
19.1.2OlympiteNa5Li(PO4)2Orth.
19.1.3NahpoiteNa2HPO4Mon. 2/m : P21/m
19.1.4DorfmaniteNa2HPO4 · 2H2OOrth.
19.1.5NalipoiteNaLi2PO4Orth.
19.1.6StercoriteNa(NH4)HPO4 · 4H2OTric.
19.1.7Archerite(K,NH4)(H2PO4)Tet. 4 2m : I4 2d
19.1.9Phosphammite(NH4)2(HPO4)Mon. 2/m : P21/b
19.1.10LithiophiliteLiMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.1.11SickleriteLi1-x(Mn3+xMn2+1-x)PO4Orth.
19.1.12FerrisickleriteLi1-x(Fe3+xFe2+1-x)PO4Orth.
19.1.13TriphyliteLiFe2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.1.14TavoriteLiFe3+(PO4)(OH)Tric. 1 : P1
19.1.15MarićiteNaFe2+(PO4)Orth. mmm (2/m 2/m 2/m) : Pmna

Other InformationHide

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

References for BiphosphammiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Acta Crystallographica B29 (1973): 2721-2732.

Internet Links for BiphosphammiteHide

Localities for BiphosphammiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • South Australia
    • Flinders Ranges
      • North Flinders Ranges
        • Wooltana homestead area
Snow, M. R., Pring, A., & Allen, N. (2014). Minerals of the Wooltana Cave, Flinders Ranges, South Australia. Transactions of the Royal Society of South Australia, 138(2), 214-230.
  • Western Australia
    • Dundas Shire
      • Cocklebiddy Roadhouse
Mineralogical Magazine(1972) 38, 965-967
      • Madura Roadhouse
Mineralogical Magazine (1974): 39: 889.-890.
Mineralogical Magazine (1977): 41: 33-35.
Bahamas
 
  • San Salvador District
    • San Salvador Island
Onac B.P., Sumrall J., Mylroie J.E., Kearns J. (2009): Cave minerals of San Salvador Island, Bahamas. The University of South Florida karst studies series, 1, 70 pp.
Botswana
 
  • North-West District
    • Ngamiland West District
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
Chile
 
  • Antofagasta Region
    • El Loa Province
      • San Pedro de Atacama
        • Cordillera de la Sal
De Waele, J., Forti, P., Picotti, V., Galli, E., Rossi, A., Brook, G., & Cucchi, F. (2009). Cave deposits in Cordillera de la Sal (Atacama, Chile). Geological Constrains on the Onset and Evolution of an Extreme Environment: the Atacama area. Geoacta, Special Publication, 2, 113-117.
Peru
 
  • La Libertad Department
    • Virù Province
C U Sheppard (1870) Rural Carolinian, 1,471
Saudi Arabia
 
  • Mintaqah Makkah
Saudi Geological Survey Open-File Report SGS-OF-2004-12, 68 p.
Mineral and/or Locality  
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