Mineralogy Database

Johannsenite Mineral Data

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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

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  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

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  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 - Prismatic H-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),
 

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

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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:

 

 
   
 


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