Mineralogy Database

Ferromerrillite Mineral Data

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General Ferromerrillite Information

Help on Chemical  Formula: Chemical Formula: Ca9NaFe(PO4)7
Help on Composition: Composition: Molecular Weight = 1,095.41 gm
   Sodium       1.09 %  Na    1.47 % Na2O
   Calcium     33.29 %  Ca   46.59 % CaO
   Magnesium    0.44 %  Mg    0.74 % MgO
   Manganese    0.35 %  Mn    0.45 % MnO
   Iron         4.13 %  Fe    5.31 % FeO
   Phosphorus  19.79 %  P    45.35 % P2O5
   Oxygen      40.90 %  O
              ______        ______ 
              100.00 %       99.91 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca9.1Na0.52Fe2+0.81Mg0.2Mn2+0.07(PO4)7
Help on Environment: Environment: Whitlockite group.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Shergotty meteorite, Gaya, Bihar, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Fe analog of merrillite.
Help on Synonym: Synonym: IMA2006-039

Ferromerrillite Image

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Comments: Polished section grain mount of ferromerrillite with analysis..
Location: Meteorite Los Angeles, Shergotite, Martian basalt. Scale: See Image.
© Diederik Visser

Ferromerrillite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.58821
Help on Cell Dimensions: Cell Dimensions: a = 10.372, c = 37.217, Z = 6; V = 3,467.35 Den(Calc)= 3.15
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.86(1), 3.19(0.6), 2.594(0.5),1.917(0.2), 2.747(0.2), 2.99(0.2), 6.42(0.2), 8.13(0.2),

Physical Properties of Ferromerrillite

Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes

Optical Properties of Ferromerrillite

Help on Optical Data: Optical Data: NCalc= 1.62 - from Gladstone-Dale relationship (KC = 0.196) where Ncalc=Dcalc*KC+1

Calculated Properties of Ferromerrillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Ferromerrillite =3.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0019650188
Boson Index = 0.9980349812
Help on Photoelectric: Photoelectric: PEFerromerrillite = 6.38 barns/electron
U=PEFerromerrillite x rElectron Density= 19.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferromerrillite is Not Radioactive

Ferromerrillite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.04)Whitlockite group Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m Tuite! Ca3(PO4)2 R 3m 3m Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m
Help on  Strunz Class: Strunz Class: 08.AC.45 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
08.AC.45 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m
08.AC.45 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m
08.AC.45 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m
08.AC.45 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m
08.AC.45 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m
08.AC.45 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m
08.AC.45 Tuite! Ca3(PO4)2 R 3m 3m
08.AC.45 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m

Other Ferromerrillite Information

Help on See Also: See Also: Links to other databases for Ferromerrillite :
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.AC.45





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