Pennantite Mineral Data (original) (raw)

General Pennantite Information

Help on Chemical Formula: Chemical Formula:

Mn5Al(Si3Al)O10(OH)8

Help on Composition: Composition:

Molecular Weight = 708.96 gm

Manganese 38.75 % Mn 50.03 % MnO

Aluminum 7.61 % Al 14.38 % Al2O3

Silicon 11.88 % Si 25.42 % SiO2

Hydrogen 1.14 % H 10.16 % H2O

Oxygen 40.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Mn2+5Al2Si3O10(OH)8

Help on Environment: Environment:

Metamorhpic or hydrothermally altered manganese- and zinc-bearing assemblages.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1946

Help on Locality: Locality:

Ty Canol incline, Benault mine, Rhiw, Carnarvonshire, Lleyn Peninsula, Gwynedd, Wales. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Thomas Pennant (1726-1798), Welsh naturalist.

Help on Name Pronunciation: Name Pronunciation:

Pennantite + Pronunciation Say PENNANTITE

Help on Synonym: Synonym:

Grovesite

Pennantite Image

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

Pennantite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.5771:1:1.5238

Help on Cell Dimensions: Cell Dimensions:

a = 5.454, b = 9.45, c = 14.4, Z = 2; beta = 97.2° V = 736.33 Den(Calc)= 3.20

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 7.1(1), 2.43(0.8), 3.57(0.8),

Physical Properties of Pennantite

Help on Cleavage: Cleavage:

{001} Perfect

Help on Color: Color:

Orange red, Reddish brown.

Help on Density: Density:

3.06

Help on Diaphaneity: Diaphaneity:

Translucent

Help on Habit: Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Help on Habit: Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Help on Hardness: Hardness:

2-3 - Gypsum-Calcite

Help on Luster: Luster:

Pearly

Help on Streak: Streak:

brownish yellow

Optical Properties of Pennantite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.205,KPDmeas= 0.2144,KC= 0.2158
Ncalc = 1.66 - 1.69

Help on Optical Data: Optical Data:

Biaxial (-), a=1.646, b=1.661, g=1.661, bire=0.0150, 2V(Calc)=0, 2V(Meas)=0.

Calculated Properties of Pennantite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.98 gm/cc
note: Specific Gravity of Pennantite =3.06 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0057467392
Boson Index = 0.9942532608

Help on Photoelectric: Photoelectric:

PEPennantite = 10.55 barns/electron
U=PEPennantite x rElectron Density= 31.42 barns/cc.

Help on Radioactivity: Radioactivity:

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

Pennantite Classification

Help on Dana Class: Dana Class:

71.04.01.08 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.04)interlayered 1:1, 2:1, and octahedra

(71.04.01)Chlorite group (Tri-Dioctahedral)

71.04.01.01 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

71.04.01.02 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m

71.04.01.03 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

71.04.01.04 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.05 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.06 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

71.04.01.07 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

71.04.01.08 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.09 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

71.04.01.10 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Help on Strunz Class: Strunz Class:

09.EC.55 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.55 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

09.EC.55 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

09.EC.55 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m

09.EC.55 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

09.EC.55 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2

09.EC.55 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

09.EC.55 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m

09.EC.55 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

09.EC.55 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

09.EC.55 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1

09.EC.55 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Other Pennantite Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: See Also:

Links to other databases for Pennantite :
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

Search for Pennantite using:

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

Visit our Advertisers for Pennantite :

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

Ask about Pennantite 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 Espa�ol

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

Pennantite

Mn5Al(Si3Al)O10(OH)8
Dana No: 71.04.01.08 Strunz No: 09.EC.55
Locality:

Notes: