Ribbeite Mineral Data (original) (raw)

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

Click Here for Larger Ribbeite Image in a New Browser Window Images:

Click Here for Larger Ribbeite Image Ribbeite 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 - DipyramidalH-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),

Click Here for Large Ribbeite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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B - Bonds On/Off
Help on Above

| | Freed R L , Rouse R C , Peacor D R , American Mineralogist , 78 (1993) p.190-194, Ribbeite, a second example of edge-sharing silicate tetrahedra in the, leucophoenicite group | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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
15 - WWW-MINCRYST

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Ask about Ribbeite here :
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Print or Cut-and-Paste your Ribbeite Specimen Label here :

Ribbeite

(Mn++,Mg)5(SiO4)2(OH)2
Dana No: 52.03.02b.04 Strunz No: 09.AF.65
Locality:

Notes: