Kempite Mineral Data + Say KEMPITE


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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.
 

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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 - DipyramidalH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.81 gm/cc
note: rKempite =2.94 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00011
Boson Index = 0.99989
Help on Photoelectric: Photoelectric:

PEKempite = 15.66 barns/electron
U=PEKempite x relectron= 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: 10.1.4.1 (10)Oxyhalides and Hydroxyhalides
  (10.1)where (A)2 (O,OH)3 Xq
  (10.1.4)Dana Group
 
10.1.4.1 Kempite Mn2Cl(OH)3 Pnam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: III/D.01-20 III - Halogenides
  III/D - Oxi-halogenides with Mg - Mn - Cu - Zn - Sn
  III/D.01 - Atacamite series, Korshunovskite - Anthonyite
 
III/D.01-10 Korshunovskite Mg2Cl(OH)3·3.5-4(H2O) P1 or P1 Tri
 
III/D.01-12 Nepskoeite! Mg4Cl(OH)7·6(H2O) Pcmm,Pcm2,Pc2m Ortho
 
III/D.01-15 Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m
 
III/D.01-20 Kempite Mn2Cl(OH)3 Pnam 2/m 2/m 2/m
 
III/D.01-25 Belloite! Cu(OH)Cl P 21/a 2/m
 
III/D.01-30 Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m
 
III/D.01-40 Clinoatacamite! Cu2(OH)3Cl P 21/n 2/m
 
III/D.01-50 Botallackite Cu2Cl(OH)3 P 21/m 2/m
 
III/D.01-55 Paratacamite (Cu,Zn)2(OH)3Cl R 3 3
 
III/D.01-57 Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m
 
III/D.01-60 Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m
 
III/D.01-65 Bobkingite! Cu5Cl2(OH)8(H2O)2 C 2/m 2/m
 
III/D.01-70 Calumetite Cu(OH,Cl)2·2(H2O) Unk Ortho
 
III/D.01-80 Anthonyite Cu(OH,Cl)2·3(H2O) Unk. Mono
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Kempite

Mn2Cl(OH)3
Dana No: 10.1.4.1 Strunz No: III/D.01-20
Locality:

 

Notes:

 

 
   
 
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