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Pyrocoproite Mineral Data

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General Pyrocoproite Information

Help on Chemical  Formula: Chemical Formula: (Mg(K,Na))2P2O7
Help on Composition: Composition: Molecular Weight = 292.70 gm
   Potassium   20.04 %  K    24.14 % K2O
   Sodium       3.93 %  Na    5.29 % Na2O
   Magnesium   16.61 %  Mg   27.54 % MgO
   Phosphorus  21.16 %  P    48.50 % P2O5
   Oxygen      38.26 %  O
              ______        ______ 
              100.00 %      105.47 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2K1.5Na0.5(P2O7)
Help on Environment: Environment: Combustion of organic-rich quano which accumulates on the floor of caves inhabited by insect-eating bats. Considered a pre-cursor material for arnhemite.
Help on IMA Status: IMA Status: Not Approved IMA
Help on Locality: Locality: Arnhem Cave, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after it's derivation from bat guano combustion.
 

Pyrocoproite Image

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  Pyrocoproite

Comments: Admixture of platy indented crystals of pyrocoproite (p) and tabular opal-C (O).
Location: Ghar al Hibashi (Hebashi) is a lava cave near Harrat Nawasif/Al Buqum, located east of Makkah in the Kingdom of Saudi Arabia. Scale: See Image.
© Saudi Geological Survey

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  Pyrocoproite

Comments: SEM image of pyrocoproite crystals with concoidal fracture.
Location: Ghar al Hibashi (Hebashi) is a lava cave near Harrat Nawasif/Al Buqum, located east of Makkah in the Kingdom of Saudi Arabia. Scale: See Image.
© Saudi Geological Survey

Pyrocoproite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7348:1:2.3119
Help on Cell Dimensions: Cell Dimensions: a = 9.41, b = 5.424, c = 12.54, Z = 4; beta = 104.35° V = 620.07 Den(Calc)= 3.14
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.714(1), 2.882(0.94), 4.55(0.63),
 

Physical Properties of Pyrocoproite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.96 - 2.98, Average = 2.97
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Streak: Streak: white
 

Optical Properties of Pyrocoproite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.065 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.115 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.178,KPDmeas= 0.1882,KC= 0.2012
Ncalc = 1.6 - 1.63
Help on Optical Data: Optical Data: Biaxial (?), a=1.558, g=1.56, bire=0.0020
 

Calculated Properties of Pyrocoproite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Pyrocoproite =2.97 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPyrocoproite = 3.43 barns/electron
U=PEPyrocoproite x relectron= 10.01 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 284.46 (Gamma Ray American Petroleum Institute Units)
Concentration of Pyrocoproite per GRapi unit = 0.35 (%)

Estimated Radioactivity from Pyrocoproite - barely detectable

 

Pyrocoproite Classification

Help on  Dana Class: Dana Class: 37.00.00.00 (37)Phosphate Minerals
  (37.00)Without Dana Classification Numbers
  (37.00.00)Phosphate, Thermocaca Series
 
37.00.00.00 Arnhemite* (K,Na)2Mg2(P2O7)•5(H2O) Unk Hex
 
37.00.00.00 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m
 
37.00.00.00 Auroantimonate* AuSbO3 Ortho ? Ortho
 
37.00.00.00 Barium-zinc-alumopharmacosiderite* (Ba,K)0.5(Zn,Cu)0.5(Al,Fe)4(AsO4)3•5(H2O) I 42m 4 2m
 
37.00.00.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m
 
37.00.00.00 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono
 
37.00.00.00 Gengenbachite KFe3(H2PO4)2(HPO4)4•6H2OorKFe3H8(PO4)6•6H2O P 63mc 6mm
 
37.00.00.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m
 
37.00.00.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m
 
37.00.00.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1
 
37.00.00.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m
 
37.00.00.00 Krasnoselskite* CoWO4 P 2/c 2/m
 
37.00.00.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho
 
37.00.00.00 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4•6(H2O) Mono
 
37.00.00.00 Parwanite (Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7•30H2O P 2, Pm, P 2/m, P 21, Mono
 
37.00.00.00 Pyrocoproite* (Mg(K,Na))2P2O7 Unk Mono
 
37.00.00.00 Pyrophosphite* K2CaP2O7 P 21/n 2/m
 
37.00.00.00 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 Pyrocoproite Information

Help on References: References: NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.84,p197,1999) OPTIC PROP.(Am.Min.,Vol.84,p197,1999)
Help on See Also: See Also: Links to other databases for Pyrocoproite :
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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Pyrocoproite

(Mg(K,Na))2P2O7
Dana No: 37.00.00.00 Strunz No: 08.FA.20
Locality:

 

Notes:

 

 
   
 


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