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Ruifrancoite Mineral Data

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General Ruifrancoite Information

Help on Chemical  Formula: Chemical Formula: Ca2([ ],Mn)2(Fe+++,Mn,Mg)4Be4(PO4)6(OH)4•6H2O
Help on Composition: Composition: Molecular Weight = 1,075.85 gm
   Calcium      7.04 %  Ca    9.85 % CaO
   Magnesium    1.94 %  Mg    3.22 % MgO
   Manganese    6.28 %  Mn    8.11 % MnO
   Beryllium    3.35 %  Be    9.30 % BeO
   Aluminum     0.45 %  Al    0.85 % Al2O3
   Iron        11.84 %  Fe    3.94 % FeO / 12.54 % Fe2O3
   Phosphorus  17.27 %  P    39.58 % P2O5
   Hydrogen     1.41 %  H    12.60 % H2O
   Oxygen      50.41 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.89Mn2+0.55Fe3+1.69Mg0.86Mn2+0.68Fe2+0.59Al0.18Be4(PO4)6(OH)4.75(H2O)1.25�3.9(H2O)
Help on Environment: Environment: Occurs as a late vug-filling product in a zoned, LCT-type granitic pegmatite. Roscherite group.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Sapucaia mine, Minas Gerais, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Rui Ribeiro Franco (b. 1916), in recognition of his outstanding contributions to Brazilian mineralogy and geology.
Help on Synonym: Synonym: IMA2005-061a

Ruifrancoite Image

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Comments: Botryoidal reddish brown aggregates of ruifrancoite associated with cyrilovite, and yellowish white spheres of meurigite on white mica. (CanMin, v45:1263).
Location: Sapucaia mine, Galiléia, Minas Gerais, Brazil. Scale: See Image.
© Canadian Mineralogist

Ruifrancoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3366:1:0.5549
Help on Cell Dimensions: Cell Dimensions: a = 15.92, b = 11.91, c = 6.61, Z = 2; beta = 96.4° V = 1,245.49 Den(Calc)= 2.87
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.943(1), 4.816(0.65), 3.169(0.44),9.485(0.44), 2.643(0.42), 2.777(0.41), 3.117(0.25), 3.065(0.22),

Physical Properties of Ruifrancoite

Help on Cleavage: Cleavage: {100} Perfect, {010} Good
Help on Color: Color: Reddish brown.
Help on Density: Density: 2.88
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Streak: Streak: orange brown

Optical Properties of Ruifrancoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2337,KPDmeas= 0.2329,KC= 0.2294
Ncalc = 1.66
Help on Optical Data: Optical Data: Biaxial (+), a=1.665, b=1.665, g=1.682, bire=0.0170, 2V(Calc)=0, 2V(Meas)=0-10. Dispersion r > v very strong.

Calculated Properties of Ruifrancoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.85 gm/cc
note: Specific Gravity of Ruifrancoite =2.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PERuifrancoite = 6.87 barns/electron
U=PERuifrancoite x rElectron Density= 19.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ruifrancoite is Not Radioactive

Ruifrancoite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.07)where (AB)5 (XO4)3 Zq � x(H2O)
  (42.07.07)Roscherite group Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.DA.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DA -With small (and occasionally larger) cations
08.DA.10 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1
08.DA.10 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m
08.DA.10 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1
08.DA.10 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1
08.DA.10 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m
08.DA.10 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m
08.DA.10 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

Other Ruifrancoite Information

Help on References: References: NAME( CanMin, v45:1263) PHYS. PROP.(CanMin, v45:1263) OPTIC PROP.(CanMin, v45:1263)
Help on See Also: See Also: Links to other databases for Ruifrancoite :
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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Print or Cut-and-Paste your Ruifrancoite Specimen Label here :


Ca2([ ],Mn)2(Fe+++,Mn,Mg)4Be4(PO4)6(OH)4•6H2O
Dana No: Strunz No: 08.DA.10





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