Ribbeite Mineral Data

(Translated by https://www.hiragana.jp/)
Ribbeite Mineral Data

General Ribbeite Information

Chemical Formula:

(Mn++,Mg)5(SiO4)2(OH)2

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

Empirical Formula:

Mn²⁺_3.75Mg_1.25(SiO₄)₂(OH)₂

Environment:

Polymorph of allegehanyite.

IMA Status:

Approved IMA 1987

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.

Name Origin:

Named for Paul Ribbe of Virginia Polytechnical Institute and State University.

Name Pronunciation:

Ribbeite

Synonym:

ICSD 66646

PDF 40-491

Ribbeite Image

Images:

Ribbeite

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

Ribbeite Crystallography

Axial Ratios:

a:b:c =0.6847:1:0.3069

Cell Dimensions:

a = 10.732, b = 15.672, c = 4.811, Z = 4; V = 809.17 Den(Calc)= 3.73

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/I_o): 1.796(1), 2.552(0.8), 2.873(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
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

Cleavage:

None

Color:

Pink.

Density:

3.9

Diaphaneity:

Transparent

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

light pink

Optical Properties of Ribbeite

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

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

Electron Density:

Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Ribbeite =3.90 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Ribbeite= 12.27 barns/electron
U=PE_Ribbeite x rElectron Density= 46.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ribbeite is Not Radioactive

Ribbeite Classification

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

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

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)

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

Search for Ribbeite using:

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

Visit our Advertisers for Ribbeite :

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

Ask about Ribbeite 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 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: