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Groatite

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Professor Lee A. Groat
Formula:
NaCaMn2(PO4)(HPO4)2
Colour:
Colourless to pale yellow
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.213 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Lee A. Groat, Professor of Mineralogy at the University of British Columbia in Vancouver.
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Classification of GroatiteHide

Approved
Approval Year:
2008
8.AC.10

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
39.2.7.6

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O

Physical Properties of GroatiteHide

Vitreous
Transparency:
Translucent
Colour:
Colourless to pale yellow
Comment:
Pale orange, where massive
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Crystals are too small in cross-section to observe cleavage.
Parting:
None observed.
Fracture:
Irregular/Uneven
Density:
3.213 g/cm3 (Calculated)

Optical Data of GroatiteHide

Type:
Biaxial (+)
RI values:
nα = 1.622(1) nβ = 1.634(1) nγ = 1.663(1)
2V:
Measured: 67° (1), Calculated: 66.5°
Birefringence:
0.041
Max Birefringence:
δ = 0.041
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of GroatiteHide

Formula:
NaCaMn2(PO4)(HPO4)2
IMA Formula:
NaCaMn2(PO4)[PO3(OH)]2
Common Impurities:
Fe

Crystallography of GroatiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C1 2/c 1
Cell Parameters:
a = 12.5435(9) Å, b = 12.4324(9) Å, c = 6.7121(4) Å
β = 115.332(2)°
Ratio:
a:b:c = 1.009 : 1 : 0.54
Unit Cell V:
946.07 ų
Z:
4
Twinning:
None observed.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.204 (80)
5.653 (70)
3.608 (30)
3.187 (100)
2.788 (80)
2.726 (90)
2.580 (70)
2.185 (30)

Type Occurrence of GroatiteHide

General Appearance of Type Material:
Slightly divergent sprays of acicular crystals on whitlockite; stellate sprays embedded in whitlockite and an unidentified Na–Al phosphate; tabular mass of densely intergrown acicular crystals.
Place of Conservation of Type Material:
Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada (catalogue number M40501).
Geological Setting of Type Material:
In a vug in a single 5–10 cm mass of phosphate–carbonate mineralization in a spodumene-rich boulder.
Associated Minerals at Type Locality:

Synonyms of GroatiteHide

Other Language Names for GroatiteHide

Relationship of Groatite to other SpeciesHide

Other Members of this group:
Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3Mon.
Alluaudite-Ca□4Ca4Mn2+4Fe3+8(PO4)12Mon. 2/m : B2/b
Alluaudite-Na□4Na4Mn2+4Fe3+8(PO4)12Mon. 2/m : B2/b
Arseniopleite(Ca,Na)NaMn2+(Mn2+,Mg,Fe2+)2(AsO4)3Mon. 2/m : P2/b
BadaloviteNa2Mg2Fe(AsO4)3Mon. 2/m : B2/b
BradaczekiteNaCu4(AsO4)3Mon. 2/m : B2/b
CalciojohilleriteNaCaMg3(AsO4)3Mon. 2/m : B2/b
CanutiteNaMn3[AsO4][AsO3(OH)]2Mon. 2/m : B2/b
Caryinite(Na,Pb)(Ca,Na)CaMn2+2(AsO4)3Mon. 2/m
ErikapohliteCu3(Zn,Cu,Mg)4Ca2(AsO4)6·2H2O Mon. 2/m : B2/m
Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
Ferroalluaudite-NaNaNa4Na4Fe2+4Fe3+8(PO4)12Mon. 2/m : B2/m
FerrohagendorfiteNaCaFe2+Fe2+2(PO4)3Mon.
HagendorfiteNaCaMn2+Fe2+2(PO4)3Mon. 2/m : B2/b
Hagendorfite-(Na)(Na)Fe2+Mn2+(PO4)-(Na)(Na)Mon. 2/m : B2/b
HatertiteNa2(Ca,Na)(Fe3+,Cu)2(AsO4)3Mon. 2/m : B2/b
JohilleriteNa(Mg,Zn)3Cu(AsO4)3Mon. 2/m : B2/b
KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m
Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3Mon.
MagnesiocanutiteNaMnMg2[AsO4]2[AsO2(OH)2]Mon. 2/m : B2/b
Magnesiohatertite(Na,Ca)2Ca(Mg,Fe3+)2(AsO4)3Mon. 2/m : B2/b
ManitobaiteNa16Mn2+ 25Al8(PO4)30Mon. m : Pb
NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3Mon. 2/m : B2/b
O'DanieliteNa(Zn,Mg)3H2(AsO4)3Mon. 2/m : B2/b
VaruliteNaCaMn2+Mn2+2(PO4)3Mon. 2/m : B2/b
YazganiteNaFe3+2(Mg,Mn2+)(AsO4)3 · H2OMon. 2/m : B2/b
ZhanghuifeniteNa3Mn4Mg2Al(PO4)6Mon. 2/m
ZincobradaczekiteNaZn2Cu2(AsO4)3Mon. 2/m : B2/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
Whitlockite1 photo of Groatite associated with Whitlockite on mindat.org.
Overite1 photo of Groatite associated with Overite on mindat.org.
Cookeite1 photo of Groatite associated with Cookeite on mindat.org.
Quartz1 photo of Groatite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.AC.WopmayiteCa6Na3□Mn(PO4)3(PO3OH)4 Trig. 3m : R3c
8.AC.05HowardevansiteNaCuFe2(VO4)3Tric. 1 : P1
8.AC.10Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3Mon.
8.AC.10Arseniopleite(Ca,Na)NaMn2+(Mn2+,Mg,Fe2+)2(AsO4)3Mon. 2/m : P2/b
8.AC.10Caryinite(Na,Pb)(Ca,Na)CaMn2+2(AsO4)3Mon. 2/m
8.AC.10Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
8.AC.10HagendorfiteNaCaMn2+Fe2+2(PO4)3Mon. 2/m : B2/b
8.AC.10JohilleriteNa(Mg,Zn)3Cu(AsO4)3Mon. 2/m : B2/b
8.AC.10Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3Mon.
8.AC.10NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3Mon. 2/m : B2/b
8.AC.10VaruliteNaCaMn2+Mn2+2(PO4)3Mon. 2/m : B2/b
8.AC.10FerrohagendorfiteNaCaFe2+Fe2+2(PO4)3Mon.
8.AC.10BradaczekiteNaCu4(AsO4)3Mon. 2/m : B2/b
8.AC.10YazganiteNaFe3+2(Mg,Mn2+)(AsO4)3 · H2OMon. 2/m : B2/b
8.AC.15BobfergusoniteNa2Mn5FeAl(PO4)6Mon. 2/m : P2/b
8.AC.15Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3Mon. 2/m : P21/b
8.AC.15QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3Mon. 2/m : P21/b
8.AC.15Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3Mon. 2/m : P21/b
8.AC.15Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3Mon. 2/m
8.AC.15Ferrorosemaryite◻NaFe2+Fe3+Al(PO4)3Mon.
8.AC.15Qingheiite-(Fe2+)Na2Fe2+MgAl(PO4)3Mon. 2/m : P21/m
8.AC.18ManitobaiteNa16Mn2+ 25Al8(PO4)30Mon. m : Pb
8.AC.20MarićiteNaFe2+(PO4)Orth. mmm (2/m 2/m 2/m) : Pmna
8.AC.25Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25Palenzonaite(Ca,Na)3CaMn2+2(VO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25SchäferiteCa2NaMg2(VO4)3Iso.
8.AC.30BrianiteNa2CaMg(PO4)2Mon. 2/m : P21/b
8.AC.35Vitusite-(Ce)Na3(Ce,La,Nd)(PO4)2Orth. mm2 : Pca21
8.AC.40Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2Trig. 3m (3 2/m) : P3m1
8.AC.40Bario-olgite(Ba,Sr)(Na,Sr,REE)2Na(PO4)2 · Trig. 3 : P3
8.AC.45StrontiowhitlockiteSr9Mg(PO4)6(HPO4)Trig. 3m : R3c
8.AC.45WhitlockiteCa9Mg(PO4)6(HPO4)Trig. 3m : R3c
8.AC.45MerrilliteCa9NaMg(PO4)7Trig. 3m : R3m
8.AC.45TuiteCa3(PO4)2Trig. 3m (3 2/m) : R3m
8.AC.45FerromerrilliteCa9NaFe2+(PO4)7Trig. 3m : R3c
8.AC.45BobdownsiteCa9Mg(PO4)6(PO3F)Trig. 3m : R3c
8.AC.50Chladniite{Ca}{Na8}{Ca4Na4}{(Mg,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36Trig.
8.AC.50Galileiite{Fe2+}{Na8}{Fe2+4Na4}{Fe2+43}(PO4)36Trig. 3 : R3
8.AC.50Stornesite-(Y){(Y, Ca)}{Na62}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50XenophylliteNa4Fe2+7(PO4)6Tric. 1 : P1
8.AC.55HarrisoniteCa(Fe2+,Mg)6(PO4)2(SiO4)2Trig.
8.AC.60KosnariteKZr2(PO4)3Trig. 3m (3 2/m) : R3c
8.AC.65Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2Mon. 2/m : P21/b
8.AC.70StanfielditeCa4Mg5(PO4)6Mon.
8.AC.75RonneburgiteK2MnV4O12Mon. 2/m
8.AC.80Tillmannsite(Ag3Hg)(VO4,AsO4)Tet. 4 : I4
8.AC.85FilatoviteK(Al,Zn)2(As,Si)2O8Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

39.2.7.5KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1

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 GroatiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cooper, M.A. et al. (2009): Groatite, NaCaMn2+2(PO4)[PO3(OH)]2, a new mineral species of the alluaudite group from the Tanco pegmatite, Bernic Lake, Manitoba, Canada: description and crystal structure. Canadian Mineralogist 47, 1225-1235.

Internet Links for GroatiteHide

Localities for GroatiteHide

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

(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.
Canada (TL)
 
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
Canadian Mineralogist47,1225(2009)
Mineral and/or Locality  
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