Jeankempite
A valid IMA mineral species
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About Jeankempite
Jean Petermann Kemp Zimmer
Formula:
Ca5(AsO4)2(HAsO4)2 · 7H2O
Colour:
Colorless to white
Lustre:
Waxy
Hardness:
1½
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.
Unique Identifiers
Mindat ID:
53206
Long-form identifier:
mindat:1:1:53206:4
IMA Classification of Jeankempite
Classification of Jeankempite
8.CJ.
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Jkp | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jeankempite
Waxy
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}
At least one, on {011}
Fracture:
Irregular/Uneven
Density:
2.92(2) g/cm3 (Measured) 2.922 g/cm3 (Calculated)
Optical Data of Jeankempite
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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r < v, weak
Pleochroism:
Non-pleochroic
Comments:
Optical orientation: X ∧ c = 45°, Y ∧ b = 35°, Z ∧ a = 27°
Chemistry of Jeankempite
Mindat Formula:
Ca5(AsO4)2(HAsO4)2 · 7H2O
Element Weights:
Elements listed:
Common Impurities:
Mg,Na,S
Crystallography of Jeankempite
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)°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Jeankempite
General Appearance of Type Material:
Lamellar bundles of plates.
Place of Conservation of Type Material:
A.E. Seaman Mineral Museum, Houghton, Michigan, USA, DM 31075.
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue number 66799.
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue number 66799.
Geological Setting of Type Material:
A secondary phase on "mohawkite" and calcite.
Associated Minerals at Type Locality:
Synonyms of Jeankempite
Other Language Names for Jeankempite
Dutch:Jeankempiet
German:Jeankempit
Common Associates
Associations Based on Photo Data:
| 1 photo of Jeankempite associated with Annabergite | Ni3(AsO4)2 · 8H2O |
| 1 photo of Jeankempite associated with Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
| 8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
| 8.CJ. | Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CJ. | Caesiumpharmacosiderite | CsFe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
| 8.CJ.10 | Swaknoite | (NH4)2Ca(PO3OH)2 · H2O |
| 8.CJ.10 | Mundrabillaite | (NH4)2Ca(PO3OH)2 · H2O |
| 8.CJ.15 | Nabaphite | NaBaPO4 · 9H2O |
| 8.CJ.15 | Nastrophite | Na(Sr,Ba)PO4 · 9H2O |
| 8.CJ.20 | Haidingerite | CaHAsO4 · H2O |
| 8.CJ.25 | Rhabdophane-(Y) | YPO4 · H2O |
| 8.CJ.25 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
| 8.CJ.27 | 'Churchite-(Dy)' | (Dy,Sm,Gd,Nd)PO4 · 2H2O |
| 8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
| 8.CJ.35 | Fulbrightite | Ca(V4+O)2(As5+O4)2 · 4H2O |
| 8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
| 8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
| 8.CJ.40 | Phaunouxite | Ca3(AsO4)2 · 11H2O |
| 8.CJ.45 | Brockite | (Ca,Th,Ce)PO4 · H2O |
| 8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
| 8.CJ.45 | Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
| 8.CJ.45 | Rhabdophane-(La) | La(PO4) · H2O |
| 8.CJ.45 | Rhabdophane-(Nd) | Nd(PO4) · H2O |
| 8.CJ.45 | Tristramite | (Ca,U4+,Fe3+)(PO4,SO4) · 2H2O |
| 8.CJ.45 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
| 8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
| 8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
| 8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
| 8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
| 8.CJ.50 | Ardealite | Ca2(PO3OH)(SO4) · 4H2O |
| 8.CJ.50 | Pharmacolite | Ca(HAsO4) · 2H2O |
| 8.CJ.50 | 'Churchite-(Nd)' | Nd(PO4) · 2H2O |
| 8.CJ.55 | Mcnearite | NaCa5(AsO4)(HAsO4)4 · 4H2O |
| 8.CJ.60 | Dorfmanite | Na2(PO3OH) · 2H2O |
| 8.CJ.65 | Sincosite | Ca(V4+O)2(PO4)2 · 4H2O |
| 8.CJ.65 | Bariosincosite | Ba(V4+O)2(PO4)2 · 4H2O |
| 8.CJ.70 | Catalanoite | Na2(PO3OH) · 8H2O |
| 8.CJ.75 | Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
| 8.CJ.85 | Ningyoite | (U,Ca,Ce)2(PO4)2 · 1-2H2O |
Fluorescence of Jeankempite
none under LW or SWUV
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Jeankempite
mindat.org URL:
https://www.mindat.org/min-53206.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Jeankempite
Reference List:
Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2018) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 46. European Journal of Mineralogy, 30 (6) 1181-1189 doi:10.1127/ejm/2018/0030-2819
Localities for Jeankempite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Hålenius et al. (2018) +1 other reference |
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Mohawk Mine, Mohawk, Allouez Township, Keweenaw County, Michigan, USA