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Kayrobertsonite

A valid IMA mineral species
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03349880014951879167863.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
07616050015602591828167.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
09793700014977565072339.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
03349880014951879167863.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
08815850015600352494181.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
07862330014961841618873.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
03349880014951879167863.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
06969410015602591833005.jpg
Kayrobertsonite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
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About KayrobertsoniteHide

08940900017056151235484.jpg
Kay Robertson with Dr. Rob Lavinsky
Formula:
[MnAl2(PO4)2(OH)2(H2O)4] · 2H2O
Colour:
Snow-white
Crystal System:
Triclinic
Name:
Named in honor of Kay Robertson (born Gabriella Katherine Loewi) (b. 23 April 1920, Venice, Italy - d. March 23, 2020, Puget Sound area) of Los Angeles, California, USA, a well known collector, especially of German localities, since the 1950s. She was a founding member of the Southern California Micromineralogists Society.
The OH analogue of nordgauite. Structural topology similar to that of nordgauite, but with double amount of water molecules in the [001] channels.


Unique IdentifiersHide

Mindat ID:
46697
Long-form identifier:
mindat:1:1:46697:4
GUID
(UUID V4):
ee78beaf-06d8-48fa-a712-5dc41b90bcc5

IMA Classification of KayrobertsoniteHide

Classification of KayrobertsoniteHide

Strunz-mindat (2024):
8.DC.30

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
KayIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KayrobertsoniteHide

Colour:
Snow-white

Optical Data of KayrobertsoniteHide

Type:
Biaxial (-)
RI values:
nα = 1.530(1) nβ = 1.554(1) nγ = 1.566(1)
2V:
Measured: 70.3° (5), Calculated: 69.6°
Max Birefringence:
δ = 0.036
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemistry of KayrobertsoniteHide

Mindat Formula:
[MnAl2(PO4)2(OH)2(H2O)4] · 2H2O
Elements listed:
Al, H, Mn, O, P - search for minerals with similar chemistry

Crystallography of KayrobertsoniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 10.049(2) Å, b = 10.205(2) Å, c = 6.083(1) Å
α = 91.79(3)°, β = 99.70(3)°, γ = 98.02(3)°
Ratio:
a:b:c = 0.985 : 1 : 0.596
Unit Cell V:
607.9 ų
Z:
2
Morphology:
Intergrown masses offibrous needles up to 100 μm long and less than 5 μm wide

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.047 Å(100)
9.804 Å(8)
7.629 Å(44)
5.029 Å(12)
4.695 Å(10)
3.023 Å(12)
2.952 Å(10)
2.579 Å(10)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47c : [Carbonates, phosphates, borates, nitrates]
47e : [Vanadates, chromates, manganates]

Type Occurrence of KayrobertsoniteHide

Co-Type Localities:
ⓘ Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany
ⓘ Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA
General Appearance of Type Material:
intergrown masses of snow-white, soft, finely fibrous needles, less than 5 μm in diameter and no more than 100 μm in length
Place of Conservation of Type Material:
Co-type material is deposited in the mineralogical collections of the Museum Victoria, Melbourne, Victoria, Australia, registered numbers M53379, M53380 and M48795, and the Natural History Museum of Los Angeles County, Los Angeles, CA 90007, USA, registr
Geological Setting of Type Material:
pegmatites
Reference:
Mills, S.J., Grey, I.E., Kampf, A.R., Birch, W.D., MacRae, C.M., Smith, J.B., Keck, E. (2016) Kayrobertsonite, MnAl2(PO4)2(OH)2·6H2O, a new phosphate mineral related to nordgauite. European Journal of Mineralogy: 28: 649-654.

Synonyms of KayrobertsoniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Kayrobertsonite associated with Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O
1 photo of Kayrobertsonite associated with ZwieseliteFe2+2(PO4)F

Related Minerals - Strunz-mindat GroupingHide

8.DC.IanbruceiteZn2(AsO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.FerrivauxiteFe3+Al2(PO4)2(OH)3 · 5H2OTric. 1 : P1
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon. 2/m : B2/b
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 2 2 2 : P21 21 21
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15Cobaltarthurite(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15UM2006-27-PO:FeHZnZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.20MagnesiobermaniteMgMn3+2(PO4)2(OH)2 · 4H2OMon. 2 : P21
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25ZincostrunziteZnFe3+2(PO4)2(OH)2 · 6.5H2OTric. 1 : P1
8.DC.27BerauniteFe3+6(PO4)4O(OH)4 · 6H2OMon. m : Bb
8.DC.27TvrdýiteFe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2OMon. 2/m : B2/b
8.DC.27ZincoberauniteZnFe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric. 1 : P1
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.30KummeriteMn2+Fe3+Al(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.32TinticiteFe3+3(PO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.32KamarizaiteFe3+3(AsO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric. 1
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.50FluorwavelliteAl3(PO4)2(OH)2F · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon. m : Bm
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm (2/m 2/m 2/m)
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b
8.DC.62KenngottiteMn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : P2/b
8.DC.67MolinelloiteCu(H2O)(OH)V4+O(V5+O4)Tric. 1 : P1
8.DC.70WhitecapsiteH16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2OHex. 6/m : P63/m
8.DC.75HeimitePbCu2(AsO4)(OH)3 · 2H2OMon. 2/m
8.DC.80LedneviteCu[PO3(OH)] · H2OMon. 2/m : P21/b

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.

Internet Links for KayrobertsoniteHide

References for KayrobertsoniteHide

Localities for KayrobertsoniteHide

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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Germany (TL)
 
  • Bavaria
    • Upper Palatinate
      • Neustadt an der Waldnaab District
        • Waidhaus
          • Hagendorf
Hålenius et al. (2015) +1 other reference
EDS Jason B. Smith
USA (TL)
 
  • North Carolina
    • Cleveland County
      • Kings Mountain
Mineralogical Magazine +2 other references
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