Johannsenite  Mineral Data

Johannsenite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


General Johannsenite Information

Help on Chemical  Formula: Chemical Formula: CaMnSi2O6
Help on Composition: Composition: Molecular Weight = 247.18 gm
   Calcium    16.21 %  Ca   22.69 % CaO
   Manganese  22.23 %  Mn   28.70 % MnO
   Silicon    22.72 %  Si   48.62 % SiO2
   Oxygen     38.84 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMn2+(Si2O6)
Help on Environment: Environment: Contact metasomatic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1932
Help on Locality: Locality: Empire Zinc Company mine near Hanover, Grant County, New Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Prof. Albert Johannsen of the University of Chicago.
Help on Name Pronunciation: Name Pronunciation: Johannsenite + Pronunciation Say JOHANNSENITE
Help on Synonym: Synonym: ICSD 16906
  PDF 38-413
 

Johannsenite Image

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

Johannsenite

Comments: Mass of prismatic bluish green colored johannsenite crystals.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7.2 x 4 cm.
© John Veevaert

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

Johannsenite

Comments: Rounded glassy prismatic crystals of dark violet brown johannsenite to 1.4 cm. Long.
Location: Consols Mine, Broken Hill, NSW, Australia. Scale: 1.5x1.5x1 cm.
© Richard Dale / Dale Minerals

Johannsenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0897:1:0.578
Help on Cell Dimensions: Cell Dimensions: a = 9.978, b = 9.156, c = 5.293, Z = 4; beta = 105.48° V = 466.02 Den(Calc)= 3.52
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.048(1), 2.573(0.43), 3.025(0.43),
Click Here for Large Johannsenite Structure Window 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 , Peacor D R , American Mineralogist , 52 (1967) p.709-720, Refinement of the crystal structure of johannsenite

 

Physical Properties of Johannsenite

Help on Cleavage: Cleavage: {110} Good
Help on Color: Color: Brown, Brownish black, Greenish, Gray, Gray green.
Help on Density: Density: 3.56
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish gray
 

Optical Properties of Johannsenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2053,KPDmeas= 0.2029,KC= 0.2053
Ncalc = 1.72 - 1.73
Help on Optical Data: Optical Data: Biaxial (+), a=1.703-1.716, b=1.711-1.728, g=1.732-1.745, bire=0.0290, 2V(Calc)=64-82, 2V(Meas)=68-70.
 

Calculated Properties of Johannsenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.45 gm/cc
note: Specific Gravity of Johannsenite =3.52 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEJohannsenite = 8.51 barns/electron
U=PEJohannsenite x rElectron Density= 29.34 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Johannsenite is Not Radioactive
 

Johannsenite Classification

Help on  Dana Class: Dana Class: 65.01.03a.04 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.03a)C2/c clinopyroxenes (Ca clinopyroxenes)
 
65.01.03a.01 Diopside CaMgSi2O6 C 2/c 2/m
 
65.01.03a.02 Hedenbergite CaFeSi2O6 C 2/c 2/m
 
65.01.03a.03 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m
 
65.01.03a.04 Johannsenite CaMnSi2O6 C 2/c 2/m
 
65.01.03a.05 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m
 
65.01.03a.06 Esseneite CaFeAlSiO6 C 2/c 2/m
 
65.01.03a.07 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m
Help on  Strunz Class: Strunz Class: 09.DA.15 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
 
09.DA.15 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m
 
09.DA.15 Esseneite CaFeAlSiO6 C 2/c 2/m
 
09.DA.15 Diopside CaMgSi2O6 C 2/c 2/m
 
09.DA.15 Johannsenite CaMnSi2O6 C 2/c 2/m
 
09.DA.15 Hedenbergite CaFeSi2O6 C 2/c 2/m
 
09.DA.15 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m
 
09.DA.15 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m
 

Other Johannsenite Information

Help on References: References: NAME( MinRec) 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 Johannsenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

Search for Johannsenite using:

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

Visit our Advertisers for Johannsenite :

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

Ask about Johannsenite 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 Espaņol

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

Johannsenite

CaMnSi2O6
Dana No: 65.01.03a.04 Strunz No: 09.DA.15
Locality:

 

Notes: