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Grayite

Big Photo

Meyers Ranch, Guffey District, Park Co., Colorado, USA

Show Grayite Photos (2)
Formula:
(Th,Pb,Ca)PO
 
4
·H
 
2
O
System:HexagonalColour:Dark reddish brown, ...
Name:For Anton Gray, British Atomic Energy "authority".
Isostructural with:Rhabdophane


Originally powdery or cryptocrystalline. Rarely in subhedral resinous crystals.

Classification of Grayite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.29-60
Nickel-Strunz 10th (pending) edition ID:8.CJ.45

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
Dana 8th edition ID:40.4.7.4

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
Hey's CIM Ref.:19.10.8

19 : Phosphates
10 : Phosphates of Pb, Th, V and Bi
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Type Occurrence of Grayite

Type Locality:Gooddays Mine, Mutoko parish (Mtoko), Mashonaland East, Zimbabwe
Year of Discovery:1957
Geological Setting of type material:Originally in a lithia-rich granite pegmatite.

Occurrences of Grayite

Geological Setting:Has been found in granite pegmatite (Maine).

Physical Properties of Grayite

Lustre:Resinous, Waxy, Greasy
Diaphaneity (Transparency):Translucent
Colour:Dark reddish brown, rarely tannish yellow
Fracture:Conchoidal
Density (calculated):6.41 g/cm3

Crystallography of Grayite

Crystal System:Hexagonal
Class (H-M):6 2 2 - Trapezohedral
Space Group:P62 2 2
Cell Parameters:a = 6.957Å, c = 6.396Å
Ratio:a:c = 1 : 0.919
Unit Cell Volume:V 268.09 ų (Calculated from Unit Cell)
Z:3
X-Ray Powder Diffraction:
d-spacingIntensity
6.05 (20)
4.35 (50)
3.46 (10)
3.03 (100)
2.82 (80)
2.36 (10)
2.15 (80)
Comments:42-1389

Optical Data of Grayite

Type:Uniaxial
RI values: nα = 1.660 nβ = 1.690
Birefringence:moderate
Maximum Birefringence:δ = 1.660

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Grayite

Formula:
(Th,Pb,Ca)PO
 
4
·H
 
2
O
Essential elements:H, O, P, Th
All elements listed in formula:Ca, H, O, P, Pb, Th

Relationship of Grayite to other Species

Common Associates:
OligoclaseXenotime-(Y)Xenotime-(Y)
Related Minerals - Nickel-Strunz Grouping):

- +
8.CJ.05Stercorite
NaNH
 
4
HPO
 
4
·4H
 
2
O
8.CJ.10Mundrabillaite
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
·H
 
2
O
8.CJ.10Swaknoite
(NH
 
4
)
 
2
Ca[HPO
 
4
]
 
2
 · H
 
2
O
8.CJ.15Nabaphite
NaBaPO
 
4
·9H
 
2
O
8.CJ.15Nastrophite
Na(Sr,Ba)PO
 
4
·9H
 
2
O
8.CJ.20Haidingerite
Ca[HAsO
 
4
] · H
 
2
O
8.CJ.25Vladimirite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 5H
 
2
O
8.CJ.30Ferrarisite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 9H
 
2
O
8.CJ.35Machatschkiite
(Ca,Na)
 
6
AsO
 
4
(AsO
 
3
OH)
 
3
(PO
 
4
,SO
 
4
)·15H
 
2
O
8.CJ.40Phaunouxite
Ca
 
3
[AsO
 
4
]
 
2
 · 11H
 
2
O
8.CJ.40Rauenthalite
Ca
 
3
[AsO
 
4
]
 
2
 · 10H
 
2
O
8.CJ.45Brockite
(Ca,Th,Ce)(PO
 
4
)·H
 
2
O
8.CJ.45Rhabdophane-(Ce)
(Ce,La)PO
 
4
·H
 
2
O
8.CJ.45Rhabdophane-(La)
(La,Ce)PO
 
4
·H
 
2
O
8.CJ.45Rhabdophane-(Nd)
(Nd,Ce,La)PO
 
4
·H
 
2
O
8.CJ.45Tristramite
(Ca,U,Fe)(PO
 
4
,SO
 
4
)·2H
 
2
O
8.CJ.45UM1997-20-AsO:HU
U
4+
 
(HAsO
 
4
)
 
2
·4H
 
2
O
8.CJ.45Smirnovskite
ThCa[PO
 
4
]
 
2
 ·nH
 
2
O
8.CJ.50Ardealite
Ca
 
2
[HPO
 
4
|SO
 
4
] · 4H
 
2
O
8.CJ.50Brushite
CaHPO
 
4
·2H
 
2
O
8.CJ.50Churchite-(Y)
YPO
 
4
·2H
 
2
O
8.CJ.50Pharmacolite
CaHAsO
 
4
·2H
 
2
O
8.CJ.50Churchite-(Nd)
NdPO
 
4
·2H
 
2
O
8.CJ.55Mcnearite
NaCa
 
5
[(HAsO
 
4
)
 
4
|AsO
 
4
] · 4H
 
2
O
8.CJ.60Dorfmanite
Na
 
2
(PO
 
3
OH)·2H
 
2
O
8.CJ.65Sincosite
CaV
 
2
(PO
 
4
)
 
2
O
 
2
·5H
 
2
O
8.CJ.65Bariosincosite
Ba(V
4+
 
O)
 
2
(PO
 
4
)
 
2
·4H
 
2
O
8.CJ.70Catalanoite
Na
 
2
[HPO
 
4
] · 8H
 
2
O
8.CJ.75Guérinite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 9H
 
2
O
8.CJ.85Ningyoite
CaU(PO
 
4
)
 
2
·1-2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.10.1 Oxypyromorphite
Pb
 
10
(PO
 
4
)
 
6
O
19.10.2Plumbogummite
PbAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
19.10.3Kamitugaite
AlPb(UO
 
2
)
 
5
[(OH)
 
9
|(PO
 
4
,AsO
 
4
)
 
2
] · 5H
 
2
O
19.10.5Drugmanite
Pb(Fe
3+
 
,Al)
 
2
[OH|PO
 
4
]
 
2
19.10.6Brabantite
CaTh(PO
 
4
)
 
2
19.10.9Brockite
(Ca,Th,Ce)(PO
 
4
)·H
 
2
O
19.10.10Sincosite
CaV
 
2
(PO
 
4
)
 
2
O
 
2
·5H
 
2
O
19.10.11Ximengite
BiPO
 
4
19.10.12Paulkellerite
(BiO)
 
2
Fe
3+
 
[(OH)
 
2
|PO
 
4
]

Other Names for Grayite

Other Languages:
German:Grayit
Spanish:Grayita

Other Information

Fluorescence in UV light:Specimens from Havey #2 Quarry, Topsham, Maine fluoresce yellow in SW UV.
Thermal Behaviour:Grayite may give a monazite-like powder pattern after heating to 850 degrees C.
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 Grayite

Reference List:Bowie, 1957, Summary of Progress, Geological Survey of Great Britain for 1956, p. 67; Chronique mines outre-mer et recherche minere, v. 279 (1959); Dooley and Hathaway, 1961, USGS Professioal Paper 424-C; not American Mineralogist: 47: 419-420, contains no new data on the species.

Internet Links for Grayite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Grayite details from Handbook of Mineralogy (PDF)
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    Localities for Grayite

    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.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
    		Terada et al (1994) Chigaku Kenkyu, 43, 181-185.
    Poland
     
    • Lower Silesia (Dolnośląskie)
    		Kucha H., Wieczorek A. 1980: Ca1-xTh1-xRE2x[PO4]2 . 2H2O, a new mineral from Lower Silesia, Poland. Mineralogia Polonica, vol. 11, No 1, 123-136
    USA
     
    • Colorado
      • Gunnison Co.
        • Quartz Creek District
    		Minerals of Colorado (1997) Eckels, E. B.
        • White Earth District (Powderhorn District)
    		"Minerals of Colorado, updated & revised", p. 17, by Eckel, Edwin B., 1997
    • Connecticut
      • Middlesex Co.
        • East Hampton
    		Fred Davis - home.att.net/~fedavis/Main/Page_109.html
    • Maine
      • Sagadahoc Co.
        • Topsham
    		King, V. and Foord, E., 1994, Mineralogy of Maine.
    • Nevada
      • Mineral Co.
        • Fitting District
          • Gillis Range
    		Mineralogical Record: 30: 277-292.
    • Wisconsin
      • Jefferson Co.
        • Waterloo
    		Buchholz, T.W.. et al (2002) 29th Rochester Mineralogical Symposium, Abstracts of contributed papers, 6.
    Zimbabwe
     
    • Mashonaland East
      • Mutoko parish (Mtoko)
    		American Mineralogist 47 (1962), 419.
      • Wedza
    		Bowie, 1957, Summary of Progress, Geological Survey of Great Britain for 1956
    Mineral and/or Locality
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