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Pararobertsite

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Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Pararobertsite, etc.

Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA
Formula:
Ca2Mn33+(PO4)3O2 · 3H2O
System:
Monoclinic
Colour:
Bronze, cinnamon brown, ...
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy
Hardness:
2
Name:
Named in 1988 by Andrew C. Roberts, B. Darko Sturman, Pete J. Dunn, and Willard L. Roberts for its paramorphic relation to Robertsite
Dimorph of:
Robertsite
This page provides mineralogical data about Pararobertsite.


Classification of Pararobertsite

IMA status:
Approved
Approval Year:
1987
Strunz 8th ed.:
7/D.30-60
Nickel-Strunz 10th (pending) ed.:
8.DH.30

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
Dana 7th ed.:
42.8.5.2
Dana 8th ed.:
42.8.5.2

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
Hey's CIM Ref.:
19.12.7

19 : Phosphates
12 : Phosphates of Mn

Physical Properties of Pararobertsite

Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Bronze, cinnamon brown, Yellow, Dark Red
Comment:
Usually dar red to cinnamon brown
Streak:
Brown Red
Hardness (Mohs):
2
Tenacity:
Brittle
Cleavage:
Perfect
on {100}
Fracture:
Irregular/Uneven
Density:
3.22 g/cm3 (Measured)    3.21 g/cm3 (Calculated)

Optical Data of Pararobertsite

Type:
Biaxial (-)
RI values:
nα = 1.791 nβ = 1.811 nγ = 1.831
2V:
Measured: 84° , Calculated: 85° to 88°
Birefringence:
0.040
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
extreme
Optical Extinction:
Z^c = 4°
Pleochroism:
Weak
Comments:
X=yellowish brown; Y=Z=reddish brown; Z=Y>X

Chemical Properties of Pararobertsite

Formula:
Ca2Mn33+(PO4)3O2 · 3H2O
IMA Formula:
Ca2Mn33+O2(PO4)3 · 3H2O
Elements listed in formula:
Ca, H, Mn, O, P - search for minerals with similar chemistry

Crystallography of Pararobertsite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/c
Cell Parameters:
a = 8.825 Å, b = 13.258 Å, c = 11.087 Å
β = 101.19°
Ratio:
a:b:c = 0.666 : 1 : 0.836
Unit Cell Volume:
V 1272.54 ų
Z:
4
Morphology:
Triangular to pseudo-rhombohedral plates, sometimes rhombic plates.
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.69 (100)
5.66 (60)
5.44 (50)
2.884 (60)
2.772 (70)
2.611 (60)
2.163 (60)

Occurrences of Pararobertsite

Type Occurrence of Pararobertsite

Type Locality:
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Relationship of Pararobertsite to other Species

Structurally related to group(s):
Mitridatite Group
Common Associates:
Quartz
Quartz
Related Minerals - Nickel-Strunz Grouping):
8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 4H2O
8.DH.10LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2O
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15KeckiteCaMn2+Fe23+Fe23+(PO4)4(OH)3(H2O)7
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe23+(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaMnMg){Na}{Mn3+}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2O
8.DH.20SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2O
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2O
8.DH.25CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
8.DH.25KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
8.DH.25ZodaciteCa4Mn2+Fe43+(PO4)6(OH)4 · 12H2O
8.DH.30ArseniosideriteCa2Fe33+(AsO4)3O2 · 3H2O
8.DH.30KolfaniteCa2Fe33+O2(AsO4)3 · 2H2O
8.DH.30MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
8.DH.30RobertsiteCa2Mn33+(PO4)3O2 · 3H2O
8.DH.30Sailaufite(Ca,Na,☐)2Mn33+(AsO4)2(CO3)O2 · 3H2O
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2O
8.DH.40XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2O
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
8.DH.60BouazzeriteBi6(Mg,Co)11Fe143+(AsO4)18(OH)4O12 · 86H2O
Related Minerals - Hey's Index Grouping:
19.12.1MetaswitzeriteMn3(PO4)2 · 4H2O
19.12.2BermaniteMn2+Mn23+(PO4)2(OH)2 · 4H2O
19.12.3NatrophiliteNaMn2+PO4
19.12.4SidorenkiteNa3Mn2+(CO3)(PO4)
19.12.5Niahite(NH4)(Mn2+,Mg)(PO4) · H2O
19.12.6RobertsiteCa2Mn33+(PO4)3O2 · 3H2O
19.12.8SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2O
19.12.9MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2O
19.12.10Heterosite(Fe3+,Mn3+)PO4
19.12.11Purpurite(Mn3+,Fe3+)PO4
19.12.12Wolfeite(Fe2+,Mn2+)2(PO4)(OH)
19.12.13Triploidite(Mn2+,Fe2+)2(PO4)(OH)
19.12.14LipscombiteFe2+Fe23+(PO4)2(OH)2
19.12.15FrondeliteMn2+Fe43+(PO4)3(OH)5
19.12.16RockbridgeiteFe2+Fe43+(PO4)3(OH)5
19.12.17Kryzhanovskite(Fe3+,Mn2+)3(PO4)2(OH,H2O)3
19.12.18LandesiteMn2+3-xFex3+(PO4)2(OH)x · (3-x)H2O
19.12.19Phosphoferrite(Fe2+,Mn2+)3(PO4)2 · 3H2O
19.12.20Reddingite(Mn2+,Fe2+)3(PO4)2 · 3H2O
19.12.21EarlshannoniteMn2+Fe23+(PO4)2(OH)2 · 4H2O
19.12.22Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2O
19.12.23Switzerite(Mn,Fe)3(PO4)2 · 7H2O
19.12.24LaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
19.12.25PseudolaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
19.12.26StrunziteMn2+Fe23+(PO4)2(OH)2 · 6H2O
19.12.27StewartiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
19.12.28Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
19.12.29Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
19.12.30Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36
19.12.31JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36
19.12.32WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2O
19.12.33Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn132+}{Al}(PO4)12(OH)2
19.12.34Sarcopside(Fe2+,Mn2+,Mg)3(PO4)2
19.12.35Ludlamite(Fe,Mn,Mg)3(PO4)2 · 4H2O
19.12.36GraftoniteFe2+Fe22+(PO4)2
19.12.37WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2O
19.12.38FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
19.12.39BeusiteMn2+Mn22+ (PO4)2
19.12.40MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
19.12.41Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
19.12.42Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
19.12.43Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe23+}(PO4)4(OH)2 · 8H2O
19.12.44KeckiteCaMn2+Fe23+Fe23+(PO4)4(OH)3(H2O)7
19.12.45StanfielditeCa4Mg5(PO4)6
19.12.46Laubmannite(Fe2+,Mn2+,Ca)3Fe63+(PO4)4(OH)12
19.12.47ZodaciteCa4Mn2+Fe43+(PO4)6(OH)4 · 12H2O
19.12.48HagendorfiteNaCaMn2+Fe22+(PO4)3
19.12.49Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3
19.12.50VaruliteNaCaMn2+Mn22+(PO4)3
19.12.51GriphiteNa4Li2Ca6(Mn2+,Fe2+,Mg)19Al8(PO4)24(F,OH)8
19.12.52Attakolite(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4
19.12.53Arrojadite-(KFe){KNa}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
19.12.54Lun'okite(Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2O
19.12.55EosphoriteMn2+Al(PO4)(OH)2 · H2O
19.12.56Ernstite(Mn2+,Fe3+)Al(PO4)(OH,O)2 · H2O
19.12.57ChildreniteFe2+Al(PO4)(OH)2 · H2O
19.12.58BobfergusoniteNa2Mn5FeAl(PO4)6
19.12.59QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3
19.12.60Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
19.12.61Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
19.12.62Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
19.12.63Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O
19.12.64ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2O
19.12.65Samuelsonite(Ca,Ba)Ca8Fe22+Mn22+Al2(PO4)10(OH)2

Other Names for Pararobertsite

Synonyms:

IMA1987-039

Name in Other Languages:

Other Information

Fluorescence in UV light:
Not fluorescent
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 Pararobertsite

Reference List:
Roberts, Andrew C., Sturman, B. Darko, Dunn, P. J., and Roberts, Willard, L. (1989): Pararobertsite, Ca2Mn3+3(PO4)3)2.3H2), a New Mineral Species from the Tip Top Pegmatite, Custer County, South Dakota, and its Relationship to Robertsite. Canadian Mineralogist 27, 451-455.

(abstract), American Mineralogist (2000): 85: 1302-1306.

Internet Links for Pararobertsite

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https://www.mindat.org/min-3108.html
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    • Localities for Pararobertsite

    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.
    (TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Poland
     
    • Lower Silesia (Dolnośląskie)
      • Dzierżoniów District
        • Piława Górna (Ober Peilau; Gnadenfrei)
          • DSS Piława Górna Quarry
    		Pieczka, A., Włodek, A., Gołębiowska, B., Szełęg, E., Szuszkiewicz, A., Ilnicki, S., Nejbert, K., Turniak, K. (2015): Phosphate-bearing pegmatites in the Góry Sowie Block and adjacent areas, Sudetes, SW Poland. 7th International Symposium on Granitic Pegmatites, PEG 2015 Książ, Poland. Abstracts: 77-78
      • Ząbkowice District
        • Ząbkowice (Frankenstein)
          • Szklary (Gläsendorf)
    		Pieczka, A., Włodek, A., Gołębiowska, B., Szełęg, E., Szuszkiewicz, A., Ilnicki, S., Nejbert, K., Turniak, K. (2015): Phosphate-bearing pegmatites in the Góry Sowie Block and adjacent areas, Sudetes, SW Poland. 7th International Symposium on Granitic Pegmatites, PEG 2015 Książ, Poland. Abstracts: 77-78
    USA (TL)
     
    • South Dakota
      • Custer Co.
        • Custer District
          • Fourmile
    		Nickel & Nichols, 1991, p160 - "Mineral Reference Manual"
    Mineral and/or Locality  
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