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Jeankempite

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About JeankempiteHide

09836290015436198004937.jpg
Jean Petermann Kemp Zimmer
Formula:
Ca5(AsO4)2(HAsO4)2 · 7H2O
Colour:
colorless to white
Lustre:
Waxy
Hardness:
Specific Gravity:
2.92
Crystal System:
Triclinic
Name:
The name jeankempite honours Jean Petermann Kemp Zimmer (1917-2001), curator of the A. E. Seaman Mineral Museum from 1975-1986.
Tabular crystals, intergrown with guérinite. New structure type, slowly dehydrates via topotactic transition from guérinite, forming a structure partially related to ferrarisite.


Classification of JeankempiteHide

Approved, Pending publication
Approval Year:
2018
8.CJ.

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations

Physical Properties of JeankempiteHide

Transparency:
Transparent, Translucent
Colour:
colorless to white
Streak:
white
Hardness:
1½ on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
At least one, on {011}
Fracture:
Irregular/Uneven
Density:
2.92(2) g/cm3 (Measured)    2.922 g/cm3 (Calculated)

Optical Data of JeankempiteHide

Type:
Biaxial (+)
RI values:
nα = 1.601(2) nβ = 1.607(2) nγ = 1.619(2)
2V:
Measured: 72° (2), Calculated: 71.0°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v, weak
Pleochroism:
Non-pleochroic
Comments:
Optical orientation: X ^ c = 45°, Y ^ b = 35°, Z ^ a = 27°

Chemical Properties of JeankempiteHide

Formula:
Ca5(AsO4)2(HAsO4)2 · 7H2O
IMA Formula:
Ca5(AsO4)2(AsO3OH)2(H2O)7
Common Impurities:
Mg,Na,S

Crystallography of JeankempiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 6.710(6) Å, b = 14.901(14) Å, c = 15.940(15) Å
α = 73.583(12)°, β = 81.984(12)°, γ = 82.754(12)°
Ratio:
a:b:c = 0.45 : 1 : 1.07
Unit Cell V:
1507 ų
Z:
3
Morphology:
The mineral occurs as lamellar bundles of plates flattened on {011} and is visually indistinguishable from guérinite, forming topotactic intergrowths. It exibits one form, {011}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.25 Å(100)
5.39 Å(80)
3.791 Å(41)
3.180 Å(60)
2.954 Å(86)
2.854 Å(46)
2.701 Å(20)
1.799 Å(35)
1.628 Å(32)
Comments:
From type description

Occurrences of JeankempiteHide

Paragenetic Mode(s):

Type Occurrence of JeankempiteHide

General Appearance of Type Material:
Lamellar bundles of plates
Place of Conservation of Type Material:
A.E. Seaman Mineral Museum; DM 31075
Geological Setting of Type Material:
A secondary phase on "mohawkite" and calcite.

Synonyms of JeankempiteHide

Common AssociatesHide

Algodonite(Cu1-xAsx)
AnnabergiteNi3(AsO4)2 · 8H2O
CalciteCaCO3
CopperCu
DolomiteCaMg(CO3)2
DomeykiteCu3As
GuériniteCa5(AsO4)2(HAsO4)2 · 9H2O
LavendulanNaCaCu5(AsO4)4Cl · 5H2O
RauenthaliteCa3(AsO4)2 · 10H2O

Related Minerals - Nickel-Strunz GroupingHide

8.CJ.CaesiumpharmacosideriteCsFe4[(AsO4)3(OH)4]·4H2OIso. 4 3m : P4 3m
8.CJ.05StercoriteNa(NH4)HPO4 · 4H2OTric.
8.CJ.10Mundrabillaite(NH4)2Ca(HPO4)2 · H2OMon. m : Pm
8.CJ.10Swaknoite(NH4)2Ca(HPO4)2 · H2OOrth.
8.CJ.15NabaphiteNaBaPO4 · 9H2OIso.
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2O
8.CJ.20HaidingeriteCaHAsO4 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2OMon. 2/m : P21/b
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CJ.35Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OHex.
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2OTric.
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2OTric. 1 : P1
8.CJ.45Brockite(Ca,Th,Ce)PO4 · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Ce)Ce(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(La)La(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Nd)Nd(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
8.CJ.45Smirnovskite(Th,Ca)PO4 · nH2OHex. 6 2 2 : P62 2 2
8.CJ.50ArdealiteCa2(HPO4)(SO4) · 4H2OMon. m : Bb
8.CJ.50BrushiteCa(HPO4) · 2H2OMon. m : Bb
8.CJ.50Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
8.CJ.50PharmacoliteCa(HAsO4) · 2H2OMon. m
8.CJ.50Churchite-(Nd)Nd(PO4) · 2H2OMon.
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2OTric.
8.CJ.60DorfmaniteNa2HPO4 · 2H2OOrth.
8.CJ.65SincositeCa(VO)2(PO4)2 · 5H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
8.CJ.65BariosincositeBa(VO)2(PO4)2 · 4H2OTet.
8.CJ.70CatalanoiteNa2(HPO4) · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca
8.CJ.75GuériniteCa5(AsO4)2(HAsO4)2 · 9H2OMon. 2/m : P21/b
8.CJ.85NingyoiteCaU(PO4)2 · 1-2H2OOrth.

Fluorescence of JeankempiteHide

none under LW or SWUV

Other InformationHide

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 JeankempiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Olds, T.A., Kampf, A.R., Dal Bo, F., Burns, P.C. and Guo, X. (2018) Jeankempite, IMA 2018-090. CNMNC Newsletter No. 46, December 2018, page xxxx; Mineralogical Magazine, 82, xxxx–xxxx.

Internet Links for JeankempiteHide

Localities for JeankempiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
USA (TL)
 
  • Michigan
    • Keweenaw Co.
      • Mohawk
Olds, T.A., Kampf, A.R., Dal Bo, F., Burns, P.C. and Gao, X. (2018) Jeankempite, IMA 2018-090. CNMNC Newsletter No. 46, December 2018, page xxxx; Mineralogical Magazine, 82, xxxx–xxxx.
 
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