Mineralogy Database

Pyrophosphite Mineral Data

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General Pyrophosphite Information

Help on Chemical  Formula: Chemical Formula: K2CaP2O7
Help on Composition: Composition: Molecular Weight = 287.36 gm
   Potassium   24.35 %  K    29.34 % K2O
   Sodium       0.80 %  Na    1.08 % Na2O
   Calcium     13.81 %  Ca   19.32 % CaO
   Magnesium    0.51 %  Mg    0.84 % MgO
   Phosphorus  21.56 %  P    49.40 % P2O5
   Oxygen      38.97 %  O
              ______        ______ 
              100.00 %       99.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K1.79Na0.1Ca0.99Mg0.06P2O7
Help on Environment: Environment: Arnhemite and pyrophosphite are the principal phases in a slag that forms a thin layer in a profile of cave soil. The slag is interpreted to have resulted from the melting of ashes during the combustion of bat quano.
Help on IMA Status: IMA Status: Not Approved IMA
Help on Locality: Locality: Arhem Cave, 150 km east of Windhoek, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Greek pyros, meaning fire and the element name - Phosphorus.

Pyrophosphite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7233:1:2.2917
Help on Cell Dimensions: Cell Dimensions: a = 9.742, b = 5.653, c = 12.955, Z = 4; beta = 104.35° V = 691.19 Den(Calc)= 2.76
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.821(1), 2.987(0.64), 3.137(0.33),

Physical Properties of Pyrophosphite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 2.75 - 2.76, Average = 2.75
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Friable - The crumbly disintegration of earthy materials or highly fractured minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Pyrophosphite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1978,KPDmeas= 0.1982,KC= 0.1922
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (?), a=1.543, g=1.549, bire=0.0060

Calculated Properties of Pyrophosphite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Pyrophosphite =2.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0009101723
Boson Index = 0.9990898277
Help on Photoelectric: Photoelectric: PEPyrophosphite = 5.20 barns/electron
U=PEPyrophosphite x relectron= 14.15 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 346.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Pyrophosphite per GRapi unit = 0.29 (%)

Estimated Radioactivity from Pyrophosphite - barely detectable


Pyrophosphite Classification

Help on  Dana Class: Dana Class: (37)Phosphate Minerals
  (37.00)Without Dana Classification Numbers
  (37.00.00)Phosphate, Thermocaca Series Arnhemite* (K,Na)2Mg2(P2O7)•5(H2O) Unk Hex Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m Auroantimonate* AuSbO3 Ortho ? Ortho Barium-zinc-alumopharmacosiderite* (Ba,K)0.5(Zn,Cu)0.5(Al,Fe)4(AsO4)3•5(H2O) I 42m 4 2m Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono Gengenbachite KFe3(H2PO4)2(HPO4)4•6H2OorKFe3H8(PO4)6•6H2O P 63mc 6mm IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m Krasnoselskite* CoWO4 P 2/c 2/m Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4•6(H2O) Mono Parwanite (Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7•30H2O P 2, Pm, P 2/m, P 21, Mono Pyrocoproite* (Mg(K,Na))2P2O7 Unk Mono Pyrophosphite* K2CaP2O7 P 21/n 2/m Zinclavendulan? NaCa(Zn,Cu)5(AsO4)4Cl•4-5(H2O) Unk Ortho
Help on  Strunz Class: Strunz Class: 08.FA.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates
  08.FA -Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
08.FA.20 Pyrocoproite* (Mg(K,Na))2P2O7 Unk Mono
08.FA.20 Pyrophosphite* K2CaP2O7 P 21/n 2/m

Other Pyrophosphite Information

Help on References: References: NAME( AmMin, v84:193) PHYS. PROP.(Am.Min.,Vol.84,p193,1999) OPTIC PROP.(Am.Min.,Vol.84,p193,1999)
Help on See Also: See Also: Links to other databases for Pyrophosphite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.FA.20





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