Kempite Mineral Data

Kempite Mineral Data +

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General Kempite Information

Chemical Formula:

Mn2Cl(OH)3

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

Empirical Formula:

Mn²⁺₂Cl(OH)₃

Environment:

Oxidized portions of manganese deposits.

IMA Status:

Valid Species (Pre-IMA) 1924

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

Axial Ratios:

a:b:c =0.6817:1:0.7478

Cell Dimensions:

a = 6.49, b = 9.52, c = 7.12, Z = 4; V = 439.91 Den(Calc)= 2.96

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/I_o): 2.386(1), 5.7(0.8), 5.36(0.7),

Physical Properties of Kempite

Cleavage:

None

Color:

Emerald green.

Density:

2.94

Diaphaniety:

Translucent to Opaque

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Magnetism:

Nonmagnetic

Streak:

light green

Optical Properties of Kempite

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

Optical Data:

Biaxial (-), a=1.684, b=1.695, g=1.698, bire=0.0140

Calculated Properties of Kempite

Electron Density:

r_electron=2.81 gm/cc
note: r_Kempite=2.94 gm/cc.

Fermion Index

Fermion Index = 0.00011
Boson Index = 0.99989

Photoelectric:

PE_Kempite= 15.66 barns/electron
U=PE_Kempite x r_electron= 44.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kempite is Not Radioactive

Kempite Classification

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

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

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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: