Ruifrancoite Mineral Data

General Ruifrancoite Information

Chemical Formula: Ca2([ ],Mn)2(Fe+++,Mn,Mg)4Be4(PO4)6(OH)4•6H2O 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 Empirical Formula: Ca_1.89Mn²⁺_0.55Fe³⁺_1.69Mg_0.86Mn²⁺_0.68Fe²⁺_0.59Al_0.18Be₄(PO₄)₆(OH)_4.75(H₂O)_1.25·3.9(H₂O) Environment: Occurs as a late vug-filling product in a zoned, LCT-type granitic pegmatite. Roscherite group. IMA Status: Approved IMA 2005 (Dana # Added) Locality: Sapucaia mine, Minas Gerais, Brazil. Link to MinDat.org Location Data. Name Origin: Named for Rui Ribeiro Franco (b. 1916), in recognition of his outstanding contributions to Brazilian mineralogy and geology. Synonym: IMA2005-061a  

Ruifrancoite Image

Images:

Ruifrancoite 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

Axial Ratios: a:b:c =1.3366:1:0.5549 Cell Dimensions: a = 15.92, b = 11.91, c = 6.61, Z = 2; beta = 96.4° V = 1,245.49 Den(Calc)= 2.87 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c X Ray Diffraction: By Intensity(I/I_o): 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

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

Optical Properties of Ruifrancoite

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 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

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

Ruifrancoite Classification

Dana Class: 42.07.07.08 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen   (42.07)where (AB)5 (XO4)3 Zq · x(H2O)   (42.07.07)Roscherite group  

42.07.07.01 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1

 

42.07.07.03 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m

 

42.07.07.04 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m

 

42.07.07.05 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1

 

42.07.07.06 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

 

42.07.07.07 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1

 

42.07.07.08 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m

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

References: NAME( CanMin, v45:1263) PHYS. PROP.(CanMin, v45:1263) OPTIC PROP.(CanMin, v45:1263) 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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