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Zigrasite

Big Photo

Dunton Gem Quarry, Newry, Oxford Co., Maine, USA

Show Zigrasite Photos (5)
Formula:
MgZr(PO
 
4
)
 
2
·4H
 
2
O
System:TriclinicColour:off-white to pale-yellow ...
Hardness:3
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 if 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 Zigrasite

IMA status:Approved 2008
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:40.1.5.2

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

Type Locality:Dunton Gem Quarry, Newry, Oxford Co., Maine, USA
General Appearance of Type Material:subhedral blocky grains sometimes exceeding 1 mm in max. dimension
Associated Minerals at type locality:
TourmalineQuartzMontebrasiteMicroclineChildrenite
BerylApatite-(CaF)AmblygoniteAlbite

Physical Properties of Zigrasite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:off-white to pale-yellow or light tan
Hardness (Mohs):3
Density (measured):2.76(4) g/cm3
Density (calculated):2.66 g/cm3

Crystallography of Zigrasite

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 Volume:V 472.79 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
9.550 (100)
4.589 (40)
4.411 (50)
4.108 (70)
4.008 (50)
3.569 (30)
3.177 (40)

Chemical Properties of Zigrasite

Formula:
MgZr(PO
 
4
)
 
2
·4H
 
2
O
Essential elements:H, Mg, O, P, Zr
All elements listed in formula:H, Mg, O, P, Zr

Relationship of Zigrasite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CE.05Chudobaite
(Mg,Zn)
 
5
[HAsO
 
4
|AsO
 
4
]
 
2
 · 10H
 
2
O
8.CE.05Geigerite
Mn
 
5
[HAsO
 
4
|AsO
 
4
]
 
2
 · 10H
 
2
O
8.CE.10Newberyite
MgHPO
 
4
·3H
 
2
O
8.CE.15Brassite
MgHAsO
 
4
·4H
 
2
O
8.CE.20Phosphorrösslerite
MgHPO
 
4
·7H
 
2
O
8.CE.20Rösslerite
MgHAsO
 
4
·7H
 
2
O
8.CE.25Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CE.25Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·7H
 
2
O
8.CE.30Lindackerite
CuCu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 8-9H
 
2
O
8.CE.30IMA2008-010
CaCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
·10H
 
2
O
8.CE.30Veselovskýite
ZnCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
 · 9H
 
2
O
8.CE.30Pradetite
CoCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
·9H
 
2
O
8.CE.35Bobierrite
Mg
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Annabergite
Ni
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Arupite
Ni
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Erythrite
Co
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Ferrisymplesite
Fe
3+
3
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 5H
 
2
O
8.CE.40Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Köttigite
Zn
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Vivianite
Fe
2+
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Pakhomovskyite
Co
 
3
[PO
 
4
]
 
2
 · 8H
 
2
O
8.CE.45Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.50Cattiite
Mg
 
3
(PO
 
4
)
 
2
·22H
 
2
O
8.CE.55Koninckite
Fe
3+
 
[PO
 
4
] · 3H
 
2
O
8.CE.60Kaňkite
FeAsO
 
4
·3.5H
 
2
O
8.CE.65Steigerite
AlVO
 
4
·3H
 
2
O
8.CE.70Metaschoderite
Al
 
2
(PO
 
4
)(VO
 
4
)·6H
 
2
O
8.CE.70Schoderite
Al
 
2
(PO
 
4
)(VO
 
4
)·8H
 
2
O
8.CE.75Malhmoodite
FeZr(PO
 
4
)
 
2
·4H
 
2
O
8.CE.75Unnamed (Ca-analogue of Zigrasite)
CaZr[PO
 
4
]
 
2
·4H
 
2
O
8.CE.80Santabarbaraite
Fe
3+
3
[(OH)
 
3
|(PO
 
4
)
 
2
] · 5H
 
2
O
8.CE.85Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
·8(H
 
2
O,OH)
8.CE.85Metavivianite
Fe
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)x·(8-x)H
 
2
O

Other Names for Zigrasite

Synonyms:
IMA2008-046
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Zigrasite

Reference List:Mineralogical Magazine 73,415-420(2009)

Internet Links for Zigrasite

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    Localities for Zigrasite

    Hide Locality List
    The 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. ? 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.
    USA
     
    • Maine
      • Oxford Co.
        • Newry
    		Mineralogical Magazine 73, 415(2009)
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 00:30:12