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Perus, São Paulo, São Paulo, Brazil
© O. Dziallas
|System:||Orthorhombic||Colour:||Bright yellow; deep ...|
|Name:||Named in 1879 by Frederick A. Genth in allusion to the chemical composition, being a PHOSPHate of URANYL uranium.|
Small crystals may have thin rectangular bladed habit. See also the closely related Yingjiangite and Dewindtite.
NOTE: Modern analytical techniques applied to specimens of "phosphuranylite" in the Joseph Cilen [1916-1997] collection, Hawthorne, NJ, USA, accumulated over a period of 50 years, and containing many older specimens, identified yingjiangite in many instances (Chet Lemanski).
A secondary mineral commonly occurring in weathered zones of granite pegmatites, coating fissures near altered uraninite, and in paleochannel deposits in sandstone. Frequently present in an alteration halo around uraninite/pitchblende found in granite pegmatites. The uraninite may have in contact one of more various schoepite group minerals. Dark yellow phosphuranylite may be found as a coating on a fracture around black uraninite at several to many diameters of the core uraninite grains. Autunite group minerals are in an outer ring that may overlap with the phosphuranylite.
Classification of Phosphuranylite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||7/E.07-30|
|Nickel-Strunz 10th (pending) edition ID:||8.EC.10|
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
C : UO2:RO4 = 3:2
|Dana 7th edition ID:||188.8.131.52|
|Dana 8th edition ID:||184.108.40.206|
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq·xH2O
|Hey's CIM Ref.:||19.11.18|
19 : Phosphates
11 : Phosphates of U
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Type Occurrence of Phosphuranylite
|Type Locality:||Buchanan Mine, Waterhole Mine, (Buchanan pegmatite), Mitchell Co., North Carolina, USA|
|Year of Discovery:||1879|
|Geological Setting of type material:||Granite pegmatite|
Occurrences of Phosphuranylite
|Geological Setting:||Weathered zones of granitic pegmatites near altered uraninite. In paleochannels in Colorado Plateau type sandstone deposits.|
Physical Properties of Phosphuranylite
|Lustre:||Sub-Vitreous, Resinous, Waxy, Silky|
|Colour:||Bright yellow; deep golden-yellow, honey-yellow|
Crystallography of Phosphuranylite
|Class (H-M):||mmm (2/m 2/m 2/m) - Dipyramidal|
|Cell Parameters:||a = 15.779Å, b = 13.702Å, c = 17.253Å|
|Ratio:||a:b:c = 1.152 : 1 : 1.259|
|Unit Cell Volume:||V 3,730.17 Å³ (Calculated from Unit Cell)|
|Morphology:||Occurs as thin scales with an irregular to rectangular outline. The scales form scaly crusts, thin films and coatings. Also powdery.|
|X-Ray Powder Diffraction:|
Optical Data of Phosphuranylite
|RI values:||nα = 1.658 - 1.695 nβ = 1.699 - 1.770 nγ = 1.699 - 1.770|
|2V:||Measured: 5° to 35°|
|Maximum Birefringence:||δ = 0.041 - 0.075|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Comments:||X = Clorless to pale yellow|
Y = Z = Golden yellow
|Comments:||The refractive index of reported phosphuranylite is unreasonably large, suggesting poor identification control.|
Chemical Properties of Phosphuranylite
|Simplified for copy/paste:||(H3O)3KCa(UO2)7(PO4)4O4·8H2O|
|Essential elements:||Ca, H, K, O, P, U|
|All elements listed in formula:||Ca, H, K, O, P, U|
|Analytical Data:||Easily soluble in mineral acids|
Relationship of Phosphuranylite to other Species
|Member of:||Phosphuranylite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Phosphuranylite
|Fluorescence in UV light:||May fluoresce due to admixed autunite, etc.|
|Other Information:||Readily soluble in acids.|
|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 Phosphuranylite
Genth (1879) American Chemical Journal: 1: 92.
Frondel, C. (1950) Studies of uranium minerals (V): phosphuranylite.
American Mineralogist, 35, 756–763.
Frondel, C. (1958) Systematic mineralogy of uranium and thorium. U.S. Geological Survey Bull. 1064: 222–227.
American Mineralogist (1991): 76: 307.
Demartin, F., Diella, V., Donzelli, S., Gramaccioli, C.M., and Pilati, T. (1991) The importance of accurate crystal structure determination of uranium minerals. I. Phosphuranylite KCa(H3O)3(UO2)7(PO4)4O4·8H2O. Acta Crystallographica: B47: 439-446.
American Mineralogist (1992): 77: 1119-1120.
Coutinho, J. M. V. and Atencio, D. (2000): Phosphuranylite from Minas Gerais, Brazil and its identity with yiangjianite. M&M4, 4th Intern. Conf. on Mineralogy & Museums, Melbourne, December 4-7, 2000; Program and Abstract Volume, 35.
Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.
Frost, R. L., J. Cejka, and G. Ayoko (2008): Raman spectroscopic study of the uranyl phosphate minerals phosphuranylite and yingjiangite. Journal of Raman Spectroscopy 39,495-502(2008).
Internet Links for Phosphuranylite
Localities for Phosphuranylite
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.
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