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Pennantite Mineral Data

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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

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  Pennantite

Comments: Dark brown micaceous pennantite.
Location: Gambatesa Mine, Val Graveglia, Genova, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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 - Prismatic H-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

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Pennantite

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

 

Notes:

 

 
   
 


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