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 % Al2 O3
Iron 11.84 % Fe 3.94 % FeO / 12.54 % Fe2 O3
Phosphorus 17.27 % P 39.58 % P2 O5
Hydrogen 1.41 % H 12.60 % H2 O
Oxygen 50.41 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca1.89 Mn2+ 0.55 Fe3+ 1.69 Mg0.86 Mn2+ 0.68 Fe2+ 0.59 Al0.18 Be4 (PO4 )6 (OH)4.75 (H2 O)1.25 �3.9(H2 O)
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 - Prismatic H-M Symbol (2/m) Space Group: C 2/c
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
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:
PERuifrancoite = 6.87 barns/electronU=PERuifrancoite x r Electron 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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Ruifrancoite
Ca2([ ],Mn)2(Fe+++,Mn,Mg)4Be4(PO4)6(OH)4•6H2O
Dana No: 42.07.07.08 Strunz No: 08.DA.10
Locality:
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