Fairfieldite Mineral Data

Fairfieldite Mineral Data
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General Fairfieldite Information

Help on Chemical Formula: Chemical Formula: Ca2(Mn,Fe++)(PO4)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 361.29 gm
   Calcium     22.19 %  Ca   31.04 % CaO
   Manganese   11.40 %  Mn   14.73 % MnO
   Iron         3.86 %  Fe    4.97 % FeO
   Phosphorus  17.15 %  P    39.29 % P2O5
   Hydrogen     1.12 %  H     9.97 % H2O
   Oxygen      44.28 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mn2+0.75Fe2+0.25(PO4)2•2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1879
Help on Locality: Locality: Branchville, Redding, Fairfield County, Connecticut, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Fairfieldite + Pronunciation Say FAIRFIELDITE
Help on Synonym: Synonym: ICSD 16017
  PDF 10-390
 

Fairfieldite Image

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Fairfieldite

Comments: Transparent, cockscomb druse of fairfieldite crystals.
Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Fairfieldite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.8797:1:0.834
Help on Cell Dimensions: Cell Dimensions: a = 5.78, b = 6.57, c = 5.48, Z = 1; alpha = 102.1°, beta = 108.7°, gamma = 90.09° V = 192.74 Den(Calc)= 3.11
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 6.4(0.9), 3.03(0.8),
Help on Forms: Forms:

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Forms: ( 1 1 1) ( 1 1 0) ( 0 1 0) ( 0 0 1)

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Click Here for Large Fairfieldite Structure Window Crystal Structure:

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Fanfani L , Nunzi A , Zanazzi P F , Acta Crystallographica, Section B , 26 (1970) p.640-645, The crystal structure of fairfieldite, Locality: Foote Mine, North Carolina, USA

 

Physical Properties of Fairfieldite

Help on Cleavage: Cleavage: {???} Perfect, {???} Distinct
Help on Color: Color: Greenish white, White, Light yellow.
Help on Density: Density: 3.1
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Fairfieldite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2075,KPDmeas= 0.2088,KC= 0.2093
Ncalc = 1.65
Help on Optical Data: Optical Data: Biaxial (+), a=1.636-1.64, b=1.644-1.65, g=1.654-1.66, bire=0.0180-0.0200, 2V(Calc)=86-88, 2V(Meas)=86. Dispersion relatively weak.
 

Calculated Properties of Fairfieldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Fairfieldite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013329887
Boson Index = 0.9986670113
Help on Photoelectric: Photoelectric: PEFairfieldite = 7.55 barns/electron
U=PEFairfieldite x rElectron Density= 23.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fairfieldite is Not Radioactive
 

Fairfieldite Classification
Help on Dana Class: Dana Class: 40.02.02.01 (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) ˇ x(H2O)
  (40.02.02)Fairfieldite Subgroup (Triclinic: P-1¯)
 
40.02.02.01 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1
 
40.02.02.02 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1
 
40.02.02.03 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1
 
40.02.02.04 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1
 
40.02.02.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1
 
40.02.02.06 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1
 
40.02.02.07 Roselite-beta Ca2(Co,Mg)(AsO4)2•2(H2O) P 1 or P1 Tri
 
40.02.02.08 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri
 
40.02.02.09 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1
 
40.02.02.10 Nickeltalmessite! Ca2Ni(AsO4)2•2H2O P 1
Help on Strunz Class: Strunz Class: 08.CG.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CG -With large and medium-sized cations, RO4:H2O = 1:1
 
08.CG.05 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1
 
08.CG.05 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1
 
08.CG.05 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1
 
08.CG.05 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1
 
08.CG.05 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1
 
08.CG.05 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri
 
08.CG.05 Uranophane-beta Ca[(UO2)SiO3(OH)]2•(H2O) P 21/a 2/m
 
08.CG.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1
 
08.CG.05 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1
 

Other Fairfieldite Information
Help on References: References: 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 Fairfieldite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Fairfieldite

Ca2(Mn,Fe++)(PO4)2•2(H2O)
Dana No: 40.02.02.01 Strunz No: 08.CG.05
Locality:

 

Notes: