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Ribbeite Mineral Data

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General Ribbeite Information

Help on Chemical  Formula: Chemical Formula: (Mn++,Mg)5(SiO4)2(OH)2
Help on Composition: Composition: Molecular Weight = 454.58 gm
   Magnesium   6.68 %  Mg   11.08 % MgO
   Manganese  45.32 %  Mn   58.52 % MnO
   Silicon    12.36 %  Si   26.44 % SiO2
   Hydrogen    0.44 %  H     3.96 % H2O
   Oxygen     35.20 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+3.75Mg1.25(SiO4)2(OH)2
Help on Environment: Environment: Polymorph of allegehanyite.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: E15-11 South stope, 11 level, 1241 elevation, in the Asis West sector of the Kombat mine, located 37 km east of Otavi and 49 km south of Tsumeb in the north-central part of Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Paul Ribbe of Virginia Polytechnical Institute and State University.
Help on Name Pronunciation: Name Pronunciation: Ribbeite Say RIBBEITE
Help on Synonym: Synonym: ICSD 66646
  PDF 40-491

Ribbeite Image

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Comments: Massive pink to creamy ribbeite; slabbed polished section.
Location: South-Fayulinskoe Deposit, Southern Ural, Russia. Scale: Not Given.
© Diederik Visser

Ribbeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6847:1:0.3069
Help on Cell Dimensions: Cell Dimensions: a = 10.732, b = 15.672, c = 4.811, Z = 4; V = 809.17 Den(Calc)= 3.73
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.796(1), 2.552(0.8), 2.873(0.8),

Physical Properties of Ribbeite

Help on Cleavage: Cleavage: None
Help on Color: Color: Pink.
Help on Density: Density: 3.9
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light pink

Optical Properties of Ribbeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KPDmeas= 0.2034,KC= 0.2059
Ncalc = 1.77 - 1.8
Help on Optical Data: Optical Data: Biaxial (+), a=1.78, b=1.792, g=1.808, bire=0.0280, 2V(Calc)=84, 2V(Meas)=83.

Calculated Properties of Ribbeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Ribbeite =3.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERibbeite = 12.27 barns/electron
U=PERibbeite x rElectron Density= 46.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ribbeite is Not Radioactive

Ribbeite Classification

Help on  Dana Class: Dana Class: 52.03.02b.04 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02b)Humite group (Chondrodite series)
52.03.02b.01 Alleghanyite Mn5(SiO4)2(OH)2 P 21/a 2/m
52.03.02b.02 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 21/c 2/m
52.03.02b.03 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 21/a 2/m
52.03.02b.04 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m
52.03.02b.05 Kumtyubeite! Ca5(SiO4)2F2 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AF.65 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.65 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m

Other Ribbeite Information

Help on References: References: NAME( MinRec, v 22, pa 422) PHYS. PROP.(Am.Min.,Vol.72,p213-216,1987) OPTIC PROP.(Am.Min.,Vol.72,p213-216,1987)
Help on See Also: See Also: Links to other databases for Ribbeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 52.03.02b.04 Strunz No: 09.AF.65





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