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Pyrophosphite

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Formula:
K2Ca(P2O7)
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Named after the Greek pyros, meaning fire and the element name - Phosphorus.
A pyrophospate originated from bat guano combustion in Arnhem Cave, Namibia, about 2000 years ago. Cause of combustion unknown.

Originally described (together with another pyrophosphate, 'pyrocoproite') from Arnhem Cave, Windhoek District, Khomas Region, Namibia.
See also arnhemite.

Compare UM1991-10-PO:BaCaHMgSr.


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Classification of PyrophosphiteHide

Notes:
Intermediate member of a solid-solution series
8.FA.20

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
A : Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
38.5.8.

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous

Physical Properties of PyrophosphiteHide

Vitreous

Optical Data of PyrophosphiteHide

Type:
Biaxial
RI values:
nα = 1.543 nγ = 1.549
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak

Chemical Properties of PyrophosphiteHide

Formula:
K2Ca(P2O7)

Crystallography of PyrophosphiteHide

Crystal System:
Monoclinic

Other Language Names for PyrophosphiteHide

Related Minerals - Nickel-Strunz GroupingHide

8.FA.05Blossiteα-Cu2(V2O7)Orth. mm2 : Fdd2
8.FA.10Ziesiteβ-Cu2(V2O7)Mon.
8.FA.15ChervetitePb2(V2O7)Mon.
8.FA.15UM1999-17:O:PbVPb4(VO4)2O
8.FA.20Pyrocoproite(K,Na)2Mg(P2O7)Mon.
8.FA.25Petewilliamsite(Ni,Co)30(As2O7)15Mon. 2 : B2

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 PyrophosphiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Martini, J. E. J. (1994): Two new minerals originated from bat guano combustion in Arnhem Cave, Namibia. South African Speleological Assoc. Bull. 33, 66-69. [Abstract in Am. Mineral. 84, 193]

Internet Links for PyrophosphiteHide

Localities for PyrophosphiteHide

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.
Namibia
 
  • Khomas Region
    • Windhoek District
[Bull. South African Speleological Assoc.(1994) 33, 66-69; AmMin 84:193]
Saudi Arabia
 
  • Mintaqah Makkah
Saudi Geological Survey Open-File Report SGS-OF-2004-12, 68 p.
Mineral and/or Locality  
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