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Kempite

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About KempiteHide

James Furman Kemp
Formula:
Mn2+2(OH)3Cl
Colour:
Emerald-green
Hardness:
Specific Gravity:
~2.94
Crystal System:
Orthorhombic
Member of:
Name:
Named by Austin F. Rogers in 1924 in honor of James Furman Kemp (14 August 1859, New York City, New York, USA - 17 November 1926, New York City, New York, USA), mining geologist, and Professor of Geology, Columbia University.
Hibbingite-Kempite Series. The second purely-manganese chloride mineral after scacchite.


Classification of KempiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1924
3.DA.10a

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb
10.1.4.1

10 : OXYHALIDES AND HYDROXYHALIDES
1 : A2(O,OH)3Xq
8.10.2

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
10 : Halides of Mn

Physical Properties of KempiteHide

Transparency:
Translucent
Colour:
Emerald-green
Comment:
green in transmitted light; semitransparent
Hardness:
3½ on Mohs scale
Comment:
ca. 3.5
Density:
~2.94 g/cm3 (Measured)    2.96 g/cm3 (Calculated)

Optical Data of KempiteHide

Type:
Biaxial (-)
RI values:
nα = 1.684 nβ = 1.695 nγ = 1.698
2V:
Calculated: 54°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v
Comments:
2V: 54o52'

Chemical Properties of KempiteHide

Formula:
Mn2+2(OH)3Cl
IMA Formula:
Mn2+2Cl(OH)3

Crystallography of KempiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 6.49 Å, b = 9.52 Å, c = 7.12 Å
Ratio:
a:b:c = 0.682 : 1 : 0.748
Unit Cell V:
439.91 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals prismatic [001]; {110}, {011}, and {121} forms observed; {100} and {010} are usually absent or inconspicuous.
Comment:
Cu2Cl(OH)3 type

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.386 (100)
5.70 (80)
5.36 (70)
2.965 (70)
1.690 (35)
2.895 (20)
2.842 (20)

Type Occurrence of KempiteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA (registration no. R1352)
Geological Setting of Type Material:
Erratic boulder
Associated Minerals at Type Locality:

Other Language Names for KempiteHide

German:Kempit
Russian:Кемпит
Spanish:Kempita

Relationship of Kempite to other SpeciesHide

Member of:
Other Members of this group:
AtacamiteCu2(OH)3ClOrth. mmm (2/m 2/m 2/m) : Pnma
BotallackiteCu2(OH)3ClMon. 2/m : P21/m
ClinoatacamiteCu2(OH)3ClMon. 2/m
GillarditeCu3Ni(OH)6Cl2Trig. 3m (3 2/m) : R3m
HaydeeiteCu3Mg(OH)6Cl2Trig. 3m (3 2/m) : P3m1
HerbertsmithiteCu3Zn(OH)6Cl2Trig. 3m (3 2/m) : R3m
HibbingiteFe2+2(OH)3ClOrth.
IyoiteMnCuCl(OH)3Mon. 2/m : P21/m
KapellasiteCu3Zn(OH)6Cl2Trig. 3m (3 2/m) : P3m1
LeverettiteCu3Co(OH)6Cl2Trig. 3 : R3
MisakiiteCu3Mn(OH)6Cl2Trig. 3m (3 2/m) : P3m1
ParatacamiteCu3(Cu,Zn)(OH)6Cl2Trig. 3m (3 2/m)
Paratacamite-(Mg)Cu3(Mg,Cu)(OH)6Cl2Trig. 3 : R3
Paratacamite-(Ni)Cu3(Ni,Cu)(OH)6Cl2Trig. 3 : R3
TondiiteCu3Mg(OH)6Cl2Trig. 3m (3 2/m) : R3m
Unnamed (Cu-Zn Chloride Hydroxide)CuZnCl(OH)3Mon. 2/m : P21/m
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hausmannite1 photo of Kempite associated with Hausmannite on mindat.org.
Psilomelane1 photo of Kempite associated with Psilomelane on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.DA.CentennialiteCaCu3Cl2(OH)6 · nH2O (n ~ 0.7)Trig. 3m (3 2/m) : P3m1
3.DA.05MelanothalliteCu2Cl2OOrth.
3.DA.10aAtacamiteCu2(OH)3ClOrth. mmm (2/m 2/m 2/m) : Pnma
3.DA.10bBotallackiteCu2(OH)3ClMon. 2/m : P21/m
3.DA.10bClinoatacamiteCu2(OH)3ClMon. 2/m
3.DA.10aHibbingiteFe2+2(OH)3ClOrth.
3.DA.10cParatacamiteCu3(Cu,Zn)(OH)6Cl2Trig. 3m (3 2/m)
3.DA.10bBelloiteCu(OH)ClMon. 2/m : P21/b
3.DA.10cHerbertsmithiteCu3Zn(OH)6Cl2Trig. 3m (3 2/m) : R3m
3.DA.10cKapellasiteCu3Zn(OH)6Cl2Trig. 3m (3 2/m) : P3m1
3.DA.10cGillarditeCu3Ni(OH)6Cl2Trig. 3m (3 2/m) : R3m
3.DA.10cHaydeeiteCu3Mg(OH)6Cl2Trig. 3m (3 2/m) : P3m1
3.DA.15ClaringbulliteCu4ClF(OH)6Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DA.15BarlowiteCu4BrF(OH)6Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DA.20SimonkolleiteZn5Cl2(OH)8 · H2OTrig. 3m (3 2/m) : P3m1
3.DA.25ButtgenbachiteCu19(NO3)2(OH)32Cl4 · 2H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DA.25ConnelliteCu19(SO4)(OH)32Cl4 · 3H2OHex. 6 m2 : P62c
3.DA.30AbhuriteSn21Cl16(OH)14O6Trig.
3.DA.35PonomareviteK4Cu4Cl10OMon.
3.DA.40AnthonyiteCu(OH,Cl)2 · 3H2OMon. 2/m
3.DA.40CalumetiteCu(OH,Cl)2 · 2H2OOrth.
3.DA.45KhaidarkaniteNa0.34Cu4Al3(OH)14F3 · 2H2OMon.
3.DA.50BobkingiteCu5Cl2(OH)8 · 2H2OMon. 2/m : B2/m
3.DA.55AvdoniniteK2Cu5(OH)4Cl8 · H2OMon. 2/m
3.DA.60DroninoiteNi6Fe2+3(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.10.1ScacchiteMnCl2Trig. 3m (3 2/m) : R3m
8.10.3ChlormanganokaliteK4[MnCl6]Trig.

Other InformationHide

Notes:
Soluble in dilute acid.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for KempiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rogers, A.F. (1924) Kempite, a new manganese mineral from California. American Journal of Science: 8: 145-150.
Rogers (1949) Bulletin of the Geological Society of America: 60, no. 12, part 2: 1944.
Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 73-74.
Villars, P. Material Phases Data System (MPDS), CH-6354 Vitznau, Switzerland (ed.), Springer Materials.
Anthony, J.W., Bideaux, R.A., Bladh, K.W., Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for KempiteHide

Localities for KempiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia
 
  • Krasnoyarsk Krai
    • Taymyrskiy Autonomous Okrug
      • Taimyr Peninsula
        • Putoran Plateau
Saini-Eidukat, B., Rudashevsky, N. S., Polozov, A. G. (1996) Occurrence of Hibbingite in the Duluth Complex, Minnesota, and in the Noril'sk Complex and Korshunovskoe Iron Ore Deposit, Russia [abstract]; Institute on Lake Superior Geology Proceedings, 42nd Annual Meeting, Cable, WI, 1996; v. 42, part 1, p. 53- 54.
Pavel M. Kartashov analytical data of 2016
  • Prebaikalia (Pribaikal'e)
    • Irkutskaya Oblast'
      • Zheleznogorsk (Korshunikha)
Mazurov, M.P., Grishina, S.N., Istomin, V.E., and Titov, A.T. (2007): Geology of Ore Deposits 49(4), 271-284.; Mazurov et al (2007) Geology of Ore Deposits, 49, 271–284.
USA (TL)
 
  • California
    • Santa Clara Co.
      • Diablo Range
        • Black Wonder District
          • East Foothills
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 74; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 145; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 145; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 235; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 190.
  • Michigan
    • Keweenaw Co.
      • Copper Harbor
Carlson, S.M., Olds, T.A., Rascona, J., Smith, A.E. (2014) A new locality for volborthite from the Manganese Mine, Copper Harbor, Michigan. Mineral News, 30, #2, 1ff.
Mineral and/or Locality  
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