Kayrobertsonite
A valid IMA mineral species
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About Kayrobertsonite
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 Identifiers
Mindat ID:
46697
Long-form identifier:
mindat:1:1:46697:4
GUID
(UUID V4):
(UUID V4):
ee78beaf-06d8-48fa-a712-5dc41b90bcc5
IMA Classification of Kayrobertsonite
Approved
IMA Formula:
MnAl2(PO4)2(OH)2 · 6H2O
Approval year:
2015
First published:
2016
Type description reference:
Classification of Kayrobertsonite
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
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 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 |
---|---|---|
Kay | 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 Kayrobertsonite
Colour:
Snow-white
Optical Data of Kayrobertsonite
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Chemistry of Kayrobertsonite
Mindat Formula:
[MnAl2(PO4)2(OH)2(H2O)4] · 2H2O
Crystallography of Kayrobertsonite
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)°
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest 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 Kayrobertsonite
Co-Type Localities:
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 Kayrobertsonite
Common Associates
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 Zwieselite | Fe2+2(PO4)F |
Related Minerals - Strunz-mindat Grouping
8.DC. | Ianbruceite | Zn2(AsO4)(OH) · 3H2O |
8.DC. | Césarferreiraite | Fe2+ Fe3+2(AsO4)2(OH)2 · 8H2O |
8.DC. | Ferrivauxite | Fe3+Al2(PO4)2(OH)3 · 5H2O |
8.DC.05 | Nissonite | Cu2Mg2(PO4)2(OH)2 · 5H2O |
8.DC.07 | Euchroite | Cu2(AsO4)(OH) · 3H2O |
8.DC.10 | Legrandite | Zn2(AsO4)(OH) · H2O |
8.DC.12 | Strashimirite | Cu8(AsO4)4(OH)4 · 5H2O |
8.DC.15 | Arthurite | CuFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Earlshannonite | Mn2+Fe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | Ojuelaite | ZnFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Whitmoreite | Fe2+Fe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | Cobaltarthurite | (Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Bendadaite | Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Kunatite | CuFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UM2006-27-PO:FeHZn | ZnFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UKI-2006-(PO:AlCuFeH) | Fe2+Al3+2(PO4)2(OH)2 · 4H2O |
8.DC.17 | Kleemanite | ZnAl2(PO4)2(OH)2 · 3H2O |
8.DC.20 | Bermanite | Mn2+Mn3+2(PO4)2(OH)2 · 4H2O |
8.DC.20 | Coralloite | Mn2+Mn3+2(AsO4)2(OH)2 · 4H2O |
8.DC.20 | Magnesiobermanite | MgMn3+2(PO4)2(OH)2 · 4H2O |
8.DC.22 | Kovdorskite | Mg2(PO4)(OH) · 3H2O |
8.DC.25 | Ferristrunzite | Fe3+Fe3+2(PO4)2(OH)3 · 5H2O |
8.DC.25 | Ferrostrunzite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Metavauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.25 | Metavivianite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Strunzite | Mn2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Zincostrunzite | ZnFe3+2(PO4)2(OH)2 · 6.5H2O |
8.DC.27 | Beraunite | Fe3+6(PO4)4O(OH)4 · 6H2O |
8.DC.27 | Tvrdýite | Fe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2O |
8.DC.27 | Zincoberaunite | ZnFe3+5(PO4)4(OH)5 · 6H2O |
8.DC.30 | Gordonite | MgAl2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Laueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Mangangordonite | Mn2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Paravauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Pseudolaueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Sigloite | Fe3+Al2(PO4)2(OH)3 · 7H2O |
8.DC.30 | Stewartite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ushkovite | MgFe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ferrolaueite | Fe2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Kastningite | (Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Maghrebite | MgAl2(AsO4)2(OH)2 · 8H2O |
8.DC.30 | Nordgauite | MnAl2(PO4)2(F,OH)2 · 5H2O |
8.DC.30 | Kummerite | Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O |
8.DC.32 | Tinticite | Fe3+3(PO4)2(OH)3 · 3H2O |
8.DC.32 | Kamarizaite | Fe3+3(AsO4)2(OH)3 · 3H2O |
8.DC.35 | Vauxite | Fe2+Al2(PO4)2(OH)2 · 6H2O |
8.DC.37 | Vantasselite | Al4(PO4)3(OH)3 · 9H2O |
8.DC.40 | Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
8.DC.45 | Gormanite | (Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.45 | Souzalite | (Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.47 | Kingite | Al3(PO4)2F2(OH) · 7H2O |
8.DC.50 | Wavellite | Al3(PO4)2(OH,F)3 · 5H2O |
8.DC.50 | Allanpringite | Fe3+3(PO4)2(OH)3 · 5H2O |
8.DC.50 | Fluorwavellite | Al3(PO4)2(OH)2F · 5H2O |
8.DC.52 | Kribergite | Al5(PO4)3(SO4)(OH)4 · 4H2O |
8.DC.55 | Mapimite | Zn2Fe3+3(AsO4)3(OH)4 · 10H2O |
8.DC.57 | Ogdensburgite | Ca2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O |
8.DC.60 | Nevadaite | (Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O |
8.DC.60 | Cloncurryite | Cu0.5(VO)0.5Al2(PO4)2F2 · 5H2O |
8.DC.62 | Kenngottite | Mn2+3Fe3+4(PO4)4(OH)6(H2O)2 |
8.DC.67 | Molinelloite | Cu(H2O)(OH)V4+O(V5+O4) |
8.DC.70 | Whitecapsite | H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O |
8.DC.75 | Heimite | PbCu2(AsO4)(OH)3 · 2H2O |
8.DC.80 | Lednevite | Cu[PO3(OH)] · H2O |
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 Kayrobertsonite
mindat.org URL:
https://www.mindat.org/min-46697.html
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Please feel free to link to this page.
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References for Kayrobertsonite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Localities for Kayrobertsonite
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).
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.
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| Hålenius et al. (2015) +1 other reference |
EDS Jason B. Smith | |
USA (TL) | |
| Mineralogical Magazine +2 other references |
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Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA