Groatite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Groatite
Formula:
NaCaMn2(PO4)[PO3(OH)]2
Colour:
Colourless to pale yellow
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.213 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Lee A. Groat, Professor of Mineralogy at the University of British Columbia in Vancouver.
Unique Identifiers
Mindat ID:
39288
Long-form identifier:
mindat:1:1:39288:2
GUID
(UUID V4):
(UUID V4):
783a329c-0521-4361-b5eb-d9b7d3504241
IMA Classification of Groatite
Classification of Groatite
8.AC.10
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
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
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
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 |
---|---|---|
Goa | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Groatite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Groatite
Vitreous
Transparency:
Translucent
Colour:
Colourless to pale yellow
Comment:
Pale orange, where massive
Streak:
White
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Crystals are too small in cross-section to observe cleavage.
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 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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
X ∧ a = 35.4 (in β obtuse); Y ∧ c = 10.1° (in β acute); Z = b.
Pleochroism:
Non-pleochroic
Chemistry of Groatite
Mindat Formula:
NaCaMn2(PO4)[PO3(OH)]2
Common Impurities:
Fe
Crystallography of Groatite
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)°
β = 115.332(2)°
Ratio:
a:b:c = 1.009 : 1 : 0.54
Unit Cell V:
946.07 ų
Z:
4
Twinning:
None observed.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0006298 | Groatite | Cooper M A, Hawthorne F C, Ball N A, Ramik R A, Roberts A C (2009) Groatite, NaCaMn2(PO4)[PO3(OH)]2, a new mineral species of the alluaudite group from the Tanco Pegmatite, Bernic Lake, Manitoba, Canada: Description and crystal structure The Canadian Mineralogist 47 1225-1235 | 2009 | Tanco Pegmatite, Bernic Lake, Manitoba, Canada | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
6.204 Å | (80) |
5.653 Å | (70) |
3.608 Å | (30) |
3.187 Å | (100) |
2.788 Å | (80) |
2.726 Å | (90) |
2.580 Å | (70) |
2.185 Å | (30) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
21 : Chemically precipitated carbonate, phosphate, iron formations | |
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Groatite
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 Groatite
Relationship of Groatite to other Species
Member of:
Other Members of this group:
Alluaudite | (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3 | Mon. 2/m : B2/b |
Alluaudite-Ca□ | ◻4Ca4Mn2+4Fe3+8(PO4)12 | Mon. 2/m : B2/b |
Alluaudite-Na□ | ◻4Na4Mn2+4Fe3+8(PO4)12 | Mon. 2/m : B2/b |
Arseniopleite | NaCaMnMn2(AsO4)3 | Mon. 2/m |
Badalovite | Na2Mg2Fe(AsO4)3 | Mon. 2/m : B2/b |
Bradaczekite | NaCu4(AsO4)3 | Mon. 2/m : B2/b |
Calciohatertite | NaNaCa(CaFe3+)(AsO4)3 | Mon. 2/m : B2/b |
Calciojohillerite | NaCaMg3(AsO4)3 | Mon. 2/m : B2/b |
Camanchacaite | NaCaMg2[AsO4][AsO3(OH)]2 | Mon. 2/m : B2/b |
Canutite | NaMn3[AsO4][AsO3(OH)]2 | Mon. 2/m : B2/b |
Caryinite | (Na,Pb)(Ca,Na)CaMn2+2(AsO4)3 | Mon. 2/m |
Erikapohlite | Cu3(Zn,Cu,Mg)4Ca2(AsO4)6 · 2H2O | Mon. 2/m : B2/m |
Ferroalluaudite | (Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3 | Mon. 2/m : B2/b |
Ferroalluaudite-NaNa | Na4Na4Fe2+4Fe3+8(PO4)12 | Mon. 2/m : B2/m |
Ferrohagendorfite | NaCaFe2+Fe2+2(PO4)3 | Mon. |
Hagendorfite | NaCaMn2+Fe2+2(PO4)3 | Mon. 2/m : B2/b |
Hagendorfite-NaNa | NaNaFe2+(Mn2+,Mn3+)(PO4)3 (?) | Mon. 2/m : B2/b |
Hatertite | Na2(Ca,Na)(Fe3+,Cu)2(AsO4)3 | Mon. 2/m : B2/b |
Johillerite | Na(Mg,Zn)3Cu(AsO4)3 | Mon. 2/m : B2/b |
Keyite | Cu2+3Zn4Cd2(AsO4)6 · 2H2O | Mon. 2/m |
Khrenovite | Na3Fe3+2(AsO4)3 | Mon. 2/m : B2/b |
Maghagendorfite | (Na,◻)MgMn2+(Fe2+,Fe3+)2(PO4)3 | Mon. 2/m |
Magnesiocanutite | NaMnMg2[AsO4]2[AsO2(OH)2] | Mon. 2/m : B2/b |
Magnesiohatertite | (Na,Ca)2Ca(Mg,Fe3+)2(AsO4)3 | Mon. 2/m : B2/b |
Nickenichite | Na0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3 | Mon. 2/m : B2/b |
O'Danielite | Na(Zn,Mg)3(AsO4)(AsO3OH)2 | Mon. 2/m : B2/b |
Paraberzeliite | NaCa2Mg2(AsO4)3 | Mon. 2/m : B2/b |
Unnamed (Na-Mg Arsenate Hydroxyarsenate) | NaMg3(AsO4)(AsO3OH)2 | Mon. 2/m : B2/b |
Unnamed (Na-Zn-H Arsenate Hydrxyarsenate) | Na(Na0.6Zn0.4)Zn2(H0.6AsO4)(AsO3OH)2 | Mon. 2/m : B2/b |
Varulite | NaCaMn2+Mn2+2(PO4)3 | Mon. 2/m : B2/b |
Yazganite | NaFe3+2(Mg,Mn2+)(AsO4)3 · H2O | Mon. 2/m : B2/b |
Zhanghuifenite | Na3Mn4Mg2Al(PO4)6 | Mon. 2/m |
Zincobradaczekite | NaZn2Cu2(AsO4)3 | Mon. 2/m : B2/b |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
8.AC. | Angarfite | NaFe3+5(PO4)4(OH)4 · 4H2O |
8.AC. | Wopmayite | Ca6Na3◻Mn(PO4)3(PO3OH)4 |
8.AC.X | Dyrnaesite-(La) | Na8Ce4+(La,REE)2(PO4)6 |
8.AC. | Edtollite | K2NaCu5Fe3+O2(AsO4)4 |
8.AC. | Alumoedtollite | K2NaCu5AlO2(AsO4)4 |
8.AC. | Crocobelonite | CaFe3+2O(PO4)2 |
8.AC. | Manganobadalovite | NaNaMn(MgFe3+)(AsO4)3 |
8.AC. | Beershevaite | CaFe3+3(PO4)3O |
8.AC. | Calciohatertite | NaNaCa(CaFe3+)(AsO4)3 |
8.AC. | Kabalovite | Fe2+3Fe3+4(PO4)6 |
8.AC. | Nazarchukite | Ca2NiFe3+2(PO4)4 |
8.AC. | Changesite–(Y) | (Ca8Y)◻Fe2+(PO4)7 |
8.AC. | Crocobelonite-1M | CaFe3+2O(PO4)2 |
8.AC. | Ebnerite | (NH4)Zn(PO4) |
8.AC. | Magnesioqingheiite | Na2Mg(MgAl)(PO4)3 |
8.AC. | Epiebnerite | (NH4)Zn(PO4) |
8.AC.02 | Grigorievite | Cu3Fe3+2Al2(VO4)6 |
8.AC.02 | Koksharovite | CaMg2Fe3+4(VO4)6 |
8.AC.02 | Ziminaite | Fe3+ 6 (VO4)6 |
8.AC.05 | Calciojohillerite | NaCaMg3(AsO4)3 |
8.AC.05 | Howardevansite | NaCuFe2(VO4)3 |
8.AC.05 | O'Danielite | Na(Zn,Mg)3(AsO4)(AsO3OH)2 |
8.AC.05 va | Alluaudite-Na□ | ◻4Na4Mn2+4Fe3+8(PO4)12 |
8.AC.05 va | Alluaudite-Ca□ | ◻4Ca4Mn2+4Fe3+8(PO4)12 |
8.AC.05 va | Ferroalluaudite-NaNa | Na4Na4Fe2+4Fe3+8(PO4)12 |
8.AC.05 | Hagendorfite-NaNa | NaNaFe2+(Mn2+,Mn3+)(PO4)3 (?) |
8.AC.05 | Erikapohlite | Cu3(Zn,Cu,Mg)4Ca2(AsO4)6 · 2H2O |
8.AC.05 | Hatertite | Na2(Ca,Na)(Fe3+,Cu)2(AsO4)3 |
8.AC.05 | Unnamed (Na-Mg Arsenate Hydroxyarsenate) | NaMg3(AsO4)(AsO3OH)2 |
8.AC.05 | Unnamed (Na-Zn-H Arsenate Hydrxyarsenate) | Na(Na0.6Zn0.4)Zn2(H0.6AsO4)(AsO3OH)2 |
8.AC.05 | Zincobradaczekite | NaZn2Cu2(AsO4)3 |
8.AC.05 | Badalovite | Na2Mg2Fe(AsO4)3 |
8.AC.05 | Magnesiocanutite | NaMnMg2[AsO4]2[AsO2(OH)2] |
8.AC.05 | Magnesiohatertite | (Na,Ca)2Ca(Mg,Fe3+)2(AsO4)3 |
8.AC.05 | Khrenovite | Na3Fe3+2(AsO4)3 |
8.AC.05 | Paraberzeliite | NaCa2Mg2(AsO4)3 |
8.AC.05 | Camanchacaite | NaCaMg2[AsO4][AsO3(OH)]2 |
8.AC.05 | Manganohatertite | NaNaCa(MnFe3+)(AsO4)3 |
8.AC.07 | Zhanghuifenite | Na3Mn4Mg2Al(PO4)6 |
8.AC.07 | Ferrobobfergusonite | Na2Fe2+5Fe3+Al(PO4)6 |
8.AC.10 | Alluaudite | (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3 |
8.AC.10 | Arseniopleite | NaCaMnMn2(AsO4)3 |
8.AC.10 | Caryinite | (Na,Pb)(Ca,Na)CaMn2+2(AsO4)3 |
8.AC.10 | Ferroalluaudite | (Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3 |
8.AC.10 | Hagendorfite | NaCaMn2+Fe2+2(PO4)3 |
8.AC.10 | Johillerite | Na(Mg,Zn)3Cu(AsO4)3 |
8.AC.10 | Maghagendorfite | (Na,◻)MgMn2+(Fe2+,Fe3+)2(PO4)3 |
8.AC.10 | Nickenichite | Na0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3 |
8.AC.10 | Varulite | NaCaMn2+Mn2+2(PO4)3 |
8.AC.10 | Ferrohagendorfite | NaCaFe2+Fe2+2(PO4)3 |
8.AC.10 | Bradaczekite | NaCu4(AsO4)3 |
8.AC.15 | Bobfergusonite | Na2Mn5FeAl(PO4)6 |
8.AC.15 | Ferrowyllieite | (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 |
8.AC.15 | Qingheiite | NaNaMn2+(MgAl)(PO4)3 |
8.AC.15 | Rosemaryite | (Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3 |
8.AC.15 | Wyllieite | (Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3 |
8.AC.15 | Ferrorosemaryite | ◻NaFe2+Fe3+Al(PO4)3 |
8.AC.15 | Ferroqingheiite | NaNaFe2+(MgAl)(PO4)3 |
8.AC.17 | Czochralskiite | Na4Ca3Mg(PO4)4 |
8.AC.18 | Manitobaite | Na16Mn2+ 25Al8(PO4)30 |
8.AC.20 | Marićite | NaFe2+(PO4) |
8.AC.25 | Berzeliite | (NaCa2)Mg2(AsO4)3 |
8.AC.25 | Manganberzeliite | (NaCa2)Mn2+2(AsO4)3 |
8.AC.25 | Palenzonaite | (NaCa2)Mn2+2(VO4)3 |
8.AC.25 | Schäferite | (NaCa2)Mg2(VO4)3 |
8.AC.25 | Hedegaardite | (Ca,Na)9(Ca,Na)Mg(PO4)6(PO3OH) |
8.AC.25 | Matyhite | Ca18(Ca,◻)2Fe2+2(PO4)14 |
8.AC.30 | Brianite | Na2CaMg(PO4)2 |
8.AC.35 | Vitusite-(Ce) | Na3(Ce,La,Nd)(PO4)2 |
8.AC.40 | Olgite | (Sr,Ba)(Na,Sr,REE)2Na(PO4)2 |
8.AC.40 | Bario-olgite | (Ba,Sr)(Na,Sr,REE)2Na(PO4)2 · |
8.AC.45 | Strontiowhitlockite | Sr9Mg(PO4)6(PO3OH) |
8.AC.45 | Whitlockite | Ca9Mg(PO4)6(PO3OH) |
8.AC.45 | Merrillite | Ca9NaMg(PO4)7 |
8.AC.45 | Tuite | Ca3(PO4)2 |
8.AC.45 | Ferromerrillite | Ca9NaFe2+(PO4)7 |
8.AC.47 | Iwateite | Na2BaMn(PO4)2 |
8.AC.47 | Yurmarinite | Na7(Fe3+,Mg,Cu)4(AsO4)6 |
8.AC.47 | Ozerovaite | Na2KAl3(AsO4)4 |
8.AC.47 | Anatolyite | Na6(Ca,Na)(Mg,Fe3+)3Al(AsO4)6 |
8.AC.47 | Pansnerite | K3Na3(Fe3+,Al)6(AsO4)8 |
8.AC.50 | Chladniite | Na3CaMg11(PO4)9 |
8.AC.50 | Fillowite | Na3CaMn2+11(PO4)9 |
8.AC.50 | Johnsomervilleite | Na3CaFe11(PO4)9 |
8.AC.50 | Galileiite | Na3Fe2+Fe2+11(PO4)9 |
8.AC.50 | Xenophyllite | Na4Fe2+7(PO4)6 |
8.AC.50 | Udinaite | NaMg4(VO4)3 |
8.AC.50 | Arsenudinaite | NaMg4(AsO4)3 |
8.AC.52 | Lasnierite | (Ca,Sr)(Mg,Fe2+)2Al(P[O,F]4)3 |
8.AC.55 | Pharmazincite | KZnAsO4 |
8.AC.57 | Zubkovaite | Ca3Cu3(AsO4)4 |
8.AC.60 | Kosnarite | KZr2(PO4)3 |
8.AC.65 | Panethite | (Na,Ca)2(Mg,Fe2+)2(PO4)2 |
8.AC.70 | Stanfieldite | Ca4Mg5(PO4)6 |
8.AC.75 | Ronneburgite | K2MnV4O12 |
8.AC.80 | Tillmannsite | Ag3Hg[(V,As)O4] |
8.AC.85 | Filatovite | K(Al,Zn)2(As,Si)2O8 |
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 Groatite
mindat.org URL:
https://www.mindat.org/min-39288.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Groatite
Reference List:
Cooper, Mark A., Hawthorne, Frank C., Ball, Neil A., Ramik, Robert A., Roberts, Andrew C. (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. The Canadian Mineralogist, 47 (5) 1225-1235 doi:10.3749/canmin.47.5.1225
Localities for Groatite
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.
Canada (TL) | |
| Cooper et al. (2009) |
Quick NavTopAbout GroatiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Tanco Mine, Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada