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, GalilÃ©ia, 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

$Help on X Ray Diffraction:$ 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

Search for Ruifrancoite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ruifrancoite :

A Bijoux Google Search for Ruifrancoite
Adam's Minerals Google Search for Ruifrancoite
Cape Minerals Google Search for Ruifrancoite
Dakota Matrix Minerals Google Search for Ruifrancoite
Excalibur Mineral Corp. Google Search for Ruifrancoite
Exceptional Minerals Google Search for Ruifrancoite
John Betts Fine Minerals Search for Ruifrancoite
McDougall Minerals Google Search for Ruifrancoite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ruifrancoite
Weinrich Minerals, Inc. Google Search for Ruifrancoite

Ask about Ruifrancoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ruifrancoite Specimen Label here :

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:

Notes: