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Zigrasite

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About ZigrasiteHide

Formula:
MgZr(PO4)2 · 4H2O
Colour:
Pale-yellow or light tan, also orange to off-white
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.76
Crystal System:
Triclinic
Name:
James Zigras, a prominent young mineral collector, in 2005 observed some small orange "balls" on a specimen of green Elbaite and thought them very unusual.
He sent them to Dr. William "Skip" Simmons at the University of New Orleans who determined it was an new mineral species. Dr. Frank Hawthorne of the University of Manitoba determined the crystal structure in 2008. The species was eventually named after James Zigras. The pictures of the mindat gallery are of the type specimen and represent most of the known Zigrasite. One other specimen is currently known.
[Rock Currier 2009]
The Mg analogue of Malhmoodite.
See also Unnamed (Ca-analogue of zigrasite).


Classification of ZigrasiteHide

Approved
Approval Year:
2008
8.CE.75

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
40.1.5.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
1 : AB(XO4)·xH2O

Pronounciation of ZigrasiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ZigrasiteHide

Vitreous
Transparency:
Translucent
Colour:
Pale-yellow or light tan, also orange to off-white
Hardness:
Density:
2.76(4) g/cm3 (Measured)    2.66 g/cm3 (Calculated)

Chemical Properties of ZigrasiteHide

Formula:
MgZr(PO4)2 · 4H2O

Crystallography of ZigrasiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.3049(2) Å, b = 9.3372(4) Å, c = 9.6282(4) Å
α = 97.348(1)°, β = 91.534(1)°, γ = 90.512(1)°
Ratio:
a:b:c = 0.568 : 1 : 1.031
Unit Cell V:
472.79 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.550 (100)
4.589 (40)
4.411 (50)
4.108 (70)
4.008 (50)
3.569 (30)
3.177 (40)
2.660 (30)

Type Occurrence of ZigrasiteHide

General Appearance of Type Material:
subhedral blocky grains sometimes exceeding 1 mm in max. dimension
Associated Minerals at Type Locality:

Synonyms of ZigrasiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Albite5 photos of Zigrasite associated with Albite on mindat.org.
Elbaite3 photos of Zigrasite associated with Elbaite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.05GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.10NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.15BrassiteMg(HAsO4) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
8.CE.20RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet.
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon.
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2OMon.
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1

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

40.1.5.1MalhmooditeFeZr(PO4)2 · 4H2OMon.
40.1.5.3Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.

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 ZigrasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Magazine 73,415-420(2009)

Internet Links for ZigrasiteHide

Localities for ZigrasiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Maine
    • Oxford Co.
      • Newry
Mineralogical Magazine 73, 415(2009)
Mineral and/or Locality  
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