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Leucophosphite Mineral Data

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General Leucophosphite Information

Help on Chemical  Formula: Chemical Formula: KFe+++2(PO4)2(OH)•2(H2O)
Help on Composition: Composition: Molecular Weight = 393.77 gm
   Potassium    9.93 %  K    11.96 % K2O
   Iron        28.37 %  Fe   40.55 % Fe2O3
   Phosphorus  15.73 %  P    36.05 % P2O5
   Hydrogen     1.28 %  H    11.44 % H2O
   Oxygen      44.69 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KFe3+2(PO4)2(OH)•2(H2O)
Help on Environment: Environment: Formed by reaction between bat or bird guano and earlier iron-bearing minerals; by hydrothermal alteration of iron-rich phosphates in complex granite pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1932
Help on Locality: Locality: Sapucaia mine, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for white and the phosphate in its composition.
Help on Name Pronunciation: Name Pronunciation: Leucophosphite Say LEUCOPHOSPHITE
Help on Synonym: Synonym: ICSD 22048
  PDF 37-466

Leucophosphite Image

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  Messelite   Leucophosphite

Comments: White messelite crystals with greenish leucophosphite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Comments: Transparent greenish brown microcrystal of leucophosphite.
Location: Lone Tree Mine, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Crude or etched purple crystals of leucophospiite to 1mm in vuggy triphylite matrix.
Location: Tip Top mine, Custer Co., South Dakota, USA. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Leucophosphite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0128:1:1.0096
Help on Cell Dimensions: Cell Dimensions: a = 9.782, b = 9.658, c = 9.751, Z = 4; beta = 102.24° V = 900.28 Den(Calc)= 2.91
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): 6.79(1), 3.061(0.7), 5.99(0.7),

Physical Properties of Leucophosphite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Brown, Brownish yellow, Colorless, Greenish, White.
Help on Density: Density: 2.948
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white

Optical Properties of Leucophosphite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2482,KPDmeas= 0.245,KC= 0.256
Ncalc = 1.75
Help on Optical Data: Optical Data: Biaxial (+), a=1.707, b=1.721, g=1.739, bire=0.0320

Calculated Properties of Leucophosphite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Leucophosphite =2.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0062417633
Boson Index = 0.9937582367
Help on Photoelectric: Photoelectric: PELeucophosphite = 10.17 barns/electron
U=PELeucophosphite x relectron= 29.15 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 141.19 (Gamma Ray American Petroleum Institute Units)
Concentration of Leucophosphite per GRapi unit = 0.71 (%)

Estimated Radioactivity from Leucophosphite - barely detectable


Leucophosphite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.06)Leucophosphite Group Leucophosphite KFe2(PO4)2(OH)•2(H2O) P 21/n 2/m Tinsleyite KAl2(PO4)2(OH)•2(H2O) P 21/n 2/m Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)•2(H2O) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.DH.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.10 Leucophosphite KFe2(PO4)2(OH)•2(H2O) P 21/n 2/m
08.DH.10 Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)•2(H2O) P 21/n 2/m
08.DH.10 Tinsleyite KAl2(PO4)2(OH)•2(H2O) P 21/n 2/m

Other Leucophosphite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Leucophosphite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DH.10





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