Mineralogy Database

Kempite Mineral Data

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General Kempite Information

Help on Chemical  Formula: Chemical Formula: Mn2Cl(OH)3
Help on Composition: Composition: Molecular Weight = 196.35 gm
   Manganese  55.96 %  Mn   72.26 % MnO
   Hydrogen    1.54 %  H    13.76 % H2O
   Chlorine   18.06 %  Cl   18.06 % Cl
                -   %   Cl   -4.07 % -O=Cl2   
   Oxygen     24.45 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+2Cl(OH)3
Help on Environment: Environment: Oxidized portions of manganese deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1924
Help on Locality: Locality: Alum Rock Park, 7 miles NE of San Jose, Santa Clara Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for James Furman Kemp (1859-1926), Professor of Geology, Columbia University, New York City, New York, USA.
Help on Name Pronunciation: Name Pronunciation: Kempite Say KEMPITE
 

Kempite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6817:1:0.7478
Help on Cell Dimensions: Cell Dimensions: a = 6.49, b = 9.52, c = 7.12, Z = 4; V = 439.91 Den(Calc)= 2.96
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.386(1), 5.7(0.8), 5.36(0.7),
 

Physical Properties of Kempite

Help on Cleavage: Cleavage: None
Help on Color: Color: Emerald green.
Help on Density: Density: 2.94
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light green
 

Optical Properties of Kempite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2339,KPDmeas= 0.2355,KC= 0.2462
Ncalc = 1.72 - 1.73
Help on Optical Data: Optical Data: Biaxial (-), a=1.684, b=1.695, g=1.698, bire=0.0140
 

Calculated Properties of Kempite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Kempite =2.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001196466
Boson Index = 0.9998803534
Help on Photoelectric: Photoelectric: PEKempite = 15.66 barns/electron
U=PEKempite x rElectron Density= 44.09 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kempite is Not Radioactive
 

Kempite Classification

Help on  Dana Class: Dana Class: 10.01.04.01 (10)Oxyhalides and Hydroxyhalides
  (10.01)where (A)2 (O,OH)3 Xq
  (10.01.04)Dana Group
 
10.01.04.01 Kempite Mn2Cl(OH)3 Pnam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.DA.10a 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DA -With Cu, etc., without Pb
 
03.DA.10a Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m
 
03.DA.10a Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m
 
03.DA.10a Kempite Mn2Cl(OH)3 Pnam 2/m 2/m 2/m
 

Other Kempite 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 Kempite :
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
15 - WWW-MINCRYST

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

Kempite

Mn2Cl(OH)3
Dana No: 10.01.04.01 Strunz No: 03.DA.10a
Locality:

 

Notes:

 

 
   
 


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