Mineralogy Database

Jahnsite-(MnMnMn) Mineral Data

Search Webmineral :
  

General Jahnsite-(MnMnMn) Information

Help on Chemical Formula: Chemical Formula: MnMnMn2Fe+++2(PO4)4(OH)2•8(H2O)
Help on Composition: Composition: Molecular Weight = 889.47 gm
   Manganese   24.71 %  Mn   31.90 % MnO
   Iron        12.56 %  Fe   17.95 % Fe2O3
   Phosphorus  13.93 %  P    31.92 % P2O5
   Hydrogen     2.04 %  H    18.23 % H2O
   Oxygen      46.77 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Mn2+Mn2+2Fe3+2(PO4)4(OH)2•8(H2O)
Help on IMA Status: IMA Status: Not Approved IMA 1990
Help on Locality: Locality: Stewart mine, Pala, San Diego County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.
Help on Name Pronunciation: Name Pronunciation: Jahnsite-(MnMnMn) Say JAHNSITE-(MNMNMN)
 

Jahnsite-(MnMnMn) Image

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

  Jahnsite-(MnMnMn)

Comments: Brownish red aggregate of jahnsite-(MnMnMn).
Location: Stewart Mine, Near Pala, San Diego Co., California, USA. Scale: Specimen Size 8x5x4 mm.
© Sergey Vasiliev / Systematic Mineralogy

Jahnsite-(MnMnMn) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =2.0774:1:2.5933
Help on Cell Dimensions: Cell Dimensions: a = 15.02, b = 7.23, c = 18.75, Z = 4; beta = 100.42° V = 2,002.57 Den(Calc)= 2.95
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
 

Physical Properties of Jahnsite-(MnMnMn)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Purplish brown, Yellow, Yellow orange.
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: white
 

Optical Properties of Jahnsite-(MnMnMn)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2355,KC= 0.2398
Ncalc = 1.71
Help on Optical Data: Optical Data: Biaxial (-), a=1.682, b=1.695, g=1.707, bire=0.0250
 

Calculated Properties of Jahnsite-(MnMnMn)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Jahnsite-(MnMnMn) =2.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0028897106
Boson Index = 0.9971102894
Help on Photoelectric: Photoelectric: PEJahnsite-(MnMnMn) = 10.64 barns/electron
U=PEJahnsite-(MnMnMn) x rElectron Density= 30.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jahnsite-(MnMnMn) is Not Radioactive
 

Jahnsite-(MnMnMn) Classification
Help on Dana Class: Dana Class: 42.11.02.04 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.02)Jahnsite Group
 
42.11.02.01 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
42.11.02.02 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
42.11.02.03 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
42.11.02.04 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
Help on Strunz Class: Strunz Class: 08.DH.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
 
08.DH.15 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3•2(H2O) P 21/a 2/m
 
08.DH.15 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m
 
08.DH.15 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m
 
08.DH.15 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21/a 2/m
 
08.DH.15 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(CaFeFe)! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(NaFeMg)! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
 
08.DH.15 Jahnsite-(CaMgMg)! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
 
08.DH.15 Jahnsite-(NaMnMg)! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
 

Other Jahnsite-(MnMnMn) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Jahnsite-(MnMnMn) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Jahnsite-(MnMnMn) using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Jahnsite-(MnMnMn) :

Ask about Jahnsite-(MnMnMn) 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 Jahnsite-(MnMnMn) Specimen Label here :

Jahnsite-(MnMnMn)

MnMnMn2Fe+++2(PO4)4(OH)2•8(H2O)
Dana No: 42.11.02.04 Strunz No: 08.DH.15
Locality:

 

Notes:

 
 
   
 

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.