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KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
Bright yellow; deep ...
Sub-Vitreous, Resinous, Waxy, Silky
Named in 1879 by Frederick A. Genth in allusion to the chemical composition, being a PHOSPHate of URANYL uranium.
Isostructural with:
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

Approved, 'Grandfathered' (first described prior to 1959)

E : Uranyl phosphates and arsenates
C : UO2:RO4 = 3:2
Dana 7th ed.:

4 : (AB)5(XO4)2Zq·xH2O

19 : Phosphates
11 : Phosphates of U

Physical Properties of Phosphuranylite

Sub-Vitreous, Resinous, Waxy, Silky
Diaphaneity (Transparency):
Bright yellow; deep golden-yellow, honey-yellow
Pale yellow
Hardness (Mohs):
None Observed

Optical Data of Phosphuranylite

Biaxial (-)
RI values:
nα = 1.658 - 1.695 nβ = 1.699 - 1.770 nγ = 1.699 - 1.770
Measured: 5° to 35°
Max Birefringence:
δ = 0.041 - 0.075
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
relatively strong
Optical Extinction:
X = Clorless to pale yellow
Y = Z = Golden yellow
The refractive index of reported phosphuranylite is unreasonably large, suggesting poor identification control.

Chemical Properties of Phosphuranylite

IMA Formula:
KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
Elements listed in formula:
Analytical Data:
Easily soluble in mineral acids

Crystallography of Phosphuranylite

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cell Parameters:
a = 15.779 Å, b = 13.702 Å, c = 17.253 Å
a:b:c = 1.152 : 1 : 1.259
Unit Cell Volume:
V 3,730.17 ų (Calculated from Unit Cell)
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 Data:
10.4 (50)
7.96 (80)
4.43 (80)
3.87 (80)
3.16 (100)
3.09 (100)
2.88 (100)
2.86 (80)
ICDD 47:439

Occurrences of Phosphuranylite

Type Occurrence of Phosphuranylite

Geological Setting of Type Material:
Granite pegmatite

Relationship of Phosphuranylite to other Species

Other Members of Group:
BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2O
DewindtiteH2Pb3(UO2)2(PO4)4O4 · 12H2O
YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2O
8.EC.05Françoisite-(Nd)Nd(UO2)3(PO4)2O(OH) · 6H2O
8.EC.05PhuralumiteAl2(UO2)3(PO4)2(OH)6 · 10H2O
8.EC.05UpaliteAl(UO2)3(PO4)2O(OH) · 7H2O
8.EC.05Françoisite-(Ce)Ce(UO2)3(PO4)2O(OH) · 6H2O
8.EC.10ArsenuranyliteCa(UO2)4(AsO4)2(OH)4 · 6H2O
8.EC.10DewindtiteH2Pb3(UO2)6O4(PO4)4 · 12H2O
8.EC.10Kivuite(Th,Ca,Pb)(UO2)4(HPO4)2(OH)8 · 7H2O
8.EC.10YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2O
8.EC.15DumontitePb2(UO2)3(PO4)2O2 · 5H2O
8.EC.15HügelitePb2(UO2)3(AsO4)2O2 · 5H2O
8.EC.20MetavanmeersscheiteU(UO2)3(PO4)2(OH)6 · 2H2O
8.EC.20VanmeersscheiteU(UO2)3(PO4)2(OH)6 · 4H2O
8.EC.20ArsenovanmeersscheiteU(UO2)3(AsO4)2(OH)6 · 4H2O
8.EC.25AlthupiteAlTh(UO2)7(PO4)4O2(OH)5 · 15H2O
8.EC.30MunditeAl(UO2)3(PO4)2(OH)3 · 5.5H2O
8.EC.35PhurcaliteCa2(UO2)3O2(PO4)2 · 7H2O
8.EC.40BergeniteCa2Ba4(UO2)9O6(PO4)6 · 16H2O
19.11.1LermontoviteU4+PO4(OH) · H2O
19.11.2MetavanmeersscheiteU(UO2)3(PO4)2(OH)6 · 2H2O
19.11.3VanmeersscheiteU(UO2)3(PO4)2(OH)6 · 4H2O
19.11.4Chernikovite(H3O)(UO2)(PO4) · 3H2O
19.11.5VyacheslaviteU4+PO4(OH) · 2.5H2O
19.11.6MetanatroautuniteNa(UO2)(PO4) · 3H2O
19.11.7YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2O
19.11.8Meta-ankoleiteK(UO2)(PO4) · 3H2O
19.11.9UramphiteNH4(UO2)PO4 · 3H2O
19.11.10TorberniteCu(UO2)2(PO4)2 · 12H2O
19.11.11MetatorberniteCu(UO2)2(PO4)2 · 8H2O
19.11.12SaléeiteMg(UO2)2(PO4)2 · 10H2O
19.11.13Ningyoite(U,Ca,Ce)2(PO4)2 · 1-2H2O
19.11.14Meta-autuniteCa(UO2)2(PO4)2 · 6H2O
19.11.15AutuniteCa(UO2)2(PO4)2 · 10-12H2O
19.11.16Pseudo-autunite(H3O)4Ca2(UO2)2(PO4)4 · 5H2O
19.11.17PhurcaliteCa2(UO2)3O2(PO4)2 · 7H2O
19.11.19UlrichiteCaCu(UO2)(PO4)2 · 4H2O
19.11.20BergeniteCa2Ba4(UO2)9O6(PO4)6 · 16H2O
19.11.21Metauranocircite-IBa(UO2)2(PO4)2 · 6H2O
19.11.22UranocirciteBa(UO2)2(PO4)2 · 10H2O
19.11.23RanunculiteAl(UO2)(PO3OH)(OH)3 · 4H2O
19.11.24TrianguliteAl3(UO2)4(PO4)4(OH)5 · 5H2O
19.11.25MunditeAl(UO2)3(PO4)2(OH)3 · 5.5H2O
19.11.26UpaliteAl(UO2)3(PO4)2O(OH) · 7H2O
19.11.27FurongiteAl13(UO2)7(PO4)13(OH)14 · 58H2O
19.11.28ThreadgolditeAl(UO2)2(PO4)2(OH) · 8H2O
19.11.29PhuralumiteAl2(UO2)3(PO4)2(OH)6 · 10H2O
19.11.30MoreauiteAl3(UO2)(PO4)3(OH)2 · 13H2O
19.11.31SabugaliteHAl(UO2)4(PO4)4 · 16H2O
19.11.32Uranospathite(Al,◻)(UO2)2F(PO4)2 · 20(H2O,F)
19.11.33AlthupiteAlTh(UO2)7(PO4)4O2(OH)5 · 15H2O
19.11.34Françoisite-(Nd)Nd(UO2)3(PO4)2O(OH) · 6H2O
19.11.35Kivuite(Th,Ca,Pb)(UO2)4(HPO4)2(OH)8 · 7H2O
19.11.36ParsonsitePb2(UO2)(PO4)2 · 0-2H2O
19.11.37DewindtiteH2Pb3(UO2)6O4(PO4)4 · 12H2O
19.11.38DumontitePb2(UO2)3(PO4)2O2 · 5H2O
19.11.39PrzhevalskitePb(UO2)2(PO4)2 · 4H2O
19.11.40LehneriteMn2+(UO2)2(PO4)2 · 8H2O
19.11.42VochteniteFe2+Fe3+(UO2)4(PO4)4(OH) · 12-13H2O

Other Names for Phosphuranylite

Name in Other Languages:

Other Information

May fluoresce due to admixed autunite, etc.
Other Information:
Readily soluble in acids.
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 Phosphuranylite

Reference List:
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.

Plášil, J., Sejkora, J., Cejka, J., Škoda, R., Goliáš, V. (2009): Supergene mineralization of the Medvedín uranium deposit, Krkonoše Mountains, Czech Republic. Journal of Geosciences, 54, 15-56.

Internet Links for Phosphuranylite URL:
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Localities for Phosphuranylite

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.
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