Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Groatite

This page is currently not sponsored. Click here to sponsor this page.
Professor Lee A. Groat
Formula:
NaCaMn2(PO4)(HPO4)2
System:
Monoclinic
Colour:
Colourless to pale yellow
Hardness:
3
Name:
Named in honor of Lee A. Groat, Professor of Mineralogy at the University of British Columbia in Vancouver.

Classification of Groatite

Approved 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
mindat.org URL:
http://www.mindat.org/min-39288.html
Please feel free to link to this page.

First Recorded Occurrence of Groatite

General Appearance of First Recorded 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 First Recorded Material:
Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada (catalogue number M40501).
Geological Setting of First Recorded Material:
In a vug in a single 5–10 cm mass of phosphate–carbonate mineralization in a spodumene-rich boulder.
Associated Minerals at First Recorded Locality:

Physical Properties of Groatite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Colourless to pale yellow
Comment:
Pale orange, where massive
Streak:
White
Hardness (Mohs):
3
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)

Crystallography of Groatite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Space Group 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 Volume:
V 946.07 ų
Z:
4
Twinning:
None observed.
X-Ray 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)

Optical Data of Groatite

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 Groatite

Formula:
NaCaMn2(PO4)(HPO4)2
Essential elements:
All elements listed in formula:
Analytical Data:
Average of 4 electron-microprobe analyses; water content was calculated as two (OH) per formula unit.
P2O5 (46.66)
FeO (0.49)
MnO (29.31)
CaO (12.51)
Na2O (6.87)
H2O (3.93)
Total (99.77)
Empirical Formula:
Na1.02Ca1.02Mn2+1.90Fe0.03P3.02O12H2
Common Impurities:
Fe

Relationship of Groatite to other Species

Other Members of Group:
Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Alluaudite-Ca□4Ca4Mn42+Fe83+(PO4)12
Alluaudite-Na□4Na4Mn42+Fe83+(PO4)12
ArseniopleiteNaCaMn2+(Mn2+,Mg)2(AsO4)3
BradaczekiteNaCu4(AsO4)3
CanutiteNaMn3[AsO4][AsO3(OH)]2
Caryinite(Na,Pb)(Ca,Na)(Ca,Mn2+)(Mn2+,Mg,Fe3+)2(AsO4)3
ErikapohliteCu3(Zn,Cu,Mg)4Ca2(AsO4)6·2H2O
Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
Ferroalluaudite-NaNaNa4Na4Fe42+Fe83+(PO4)12
FerrohagendorfiteNaCaFe2+Fe22+(PO4)3
HagendorfiteNaCaMn2+Fe22+(PO4)3
Hagendorfite-NaNaNa, Mn, Fe, P, O, H (?)
Hagendorfite-Varulite SeriesNaCaMn2+(Fe2+,Fe3+,Mg)2(PO4)3
HatertiteNa2(Ca,Na)(Fe3+,Cu)2(AsO4)3
JohilleriteNa(Mg,Zn)3Cu(AsO4)3
KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O
Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3
ManitobaiteNa16Mn2+ 25Al8(PO4)30
NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3
O'DanieliteNa(Zn,Mg)3H2(AsO4)3
VaruliteNaCaMn2+Mn22+(PO4)3
YazganiteNaFe23+(Mg,Mn2+)(AsO4)3 · H2O
8.AC.05HowardevansiteNaCuFe2(VO4)3
8.AC.10Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
8.AC.10ArseniopleiteNaCaMn2+(Mn2+,Mg)2(AsO4)3
8.AC.10Caryinite(Na,Pb)(Ca,Na)(Ca,Mn2+)(Mn2+,Mg,Fe3+)2(AsO4)3
8.AC.10Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
8.AC.10HagendorfiteNaCaMn2+Fe22+(PO4)3
8.AC.10JohilleriteNa(Mg,Zn)3Cu(AsO4)3
8.AC.10Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3
8.AC.10NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3
8.AC.10VaruliteNaCaMn2+Mn22+(PO4)3
8.AC.10FerrohagendorfiteNaCaFe2+Fe22+(PO4)3
8.AC.10BradaczekiteNaCu4(AsO4)3
8.AC.10YazganiteNaFe23+(Mg,Mn2+)(AsO4)3 · H2O
8.AC.15BobfergusoniteNa2Mn5FeAl(PO4)6
8.AC.15Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3
8.AC.15QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3
8.AC.15Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3
8.AC.15Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3
8.AC.15Ferrorosemaryite◻NaFe2+Fe3+Al(PO4)3
8.AC.15Qingheiite-(Fe2+)Na2Fe2+MgAl(PO4)3
8.AC.18ManitobaiteNa16Mn2+ 25Al8(PO4)30
8.AC.20MarićiteNaFe2+(PO4)
8.AC.25BerzeliiteNaCa2(Mg,Mn2+)2(AsO4)3
8.AC.25Manganberzeliite(Ca,Na)3(Mn2+,Mg)2(AsO4)3
8.AC.25Palenzonaite(Ca,Na)3CaMn22+(VO4)3
8.AC.25SchäferiteCa2NaMg2(VO4)3
8.AC.30BrianiteNa2CaMg(PO4)2
8.AC.35Vitusite-(Ce)Na3(Ce,La,Nd)(PO4)2
8.AC.40Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2
8.AC.40Bario-olgite(Ba,Sr)(Na,Sr,REE)2Na(PO4)2 ·
8.AC.45StrontiowhitlockiteSr9Mg(PO4)6(HPO4)
8.AC.45WhitlockiteCa9Mg(PO4)6(HPO4)
8.AC.45MerrilliteCa9NaMg(PO4)7
8.AC.45TuiteCa3(PO4)2
8.AC.45FerromerrilliteCa9NaFe2+(PO4)7
8.AC.45BobdownsiteCa9Mg(PO4)6(PO3F)
8.AC.50Chladniite{Ca}{Na8}{Ca4Na4}{(Mg,Fe2+)43}(PO4)36
8.AC.50Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36
8.AC.50JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36
8.AC.50Galileiite{Fe2+}{Na8}{Fe42+Na4}{Fe432+}(PO4)36
8.AC.50Stornesite-(Y){(Y, Ca)}{Na62}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36
8.AC.50XenophylliteNa4Fe72+(PO4)6
8.AC.55HarrisoniteCa(Fe2+,Mg)6(PO4)2(SiO4)2
8.AC.60KosnariteKZr2(PO4)3
8.AC.65Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2
8.AC.70StanfielditeCa7Ca2Mg9(PO4)12
8.AC.75RonneburgiteK2MnV4O12
8.AC.80Tillmannsite(Ag3Hg)(VO4,AsO4)
8.AC.85FilatoviteK(Al,Zn)2(As,Si)2O8

Other Names for Groatite

Name in Other Languages:

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.

References for Groatite

Reference List:
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 Groatite

Localities for Groatite

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.
Canada
 
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
Can.Min.47,1225(2009)
Mineral and/or Locality  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: March 4, 2015 04:21:01 Page generated: February 28, 2015 17:32:41