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Protasite

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Formula:
Ba(UO2)3O3(OH)2 · 3H2O
System:
Monoclinic
Colour:
Light Orange
Lustre:
Sub-Adamantine
Name:
Named for Professor Jean Protas (1932– ), French mineralogist, University of Nancy, Nancy, France, who first synthesized the compound, and for his work with uranium oxide minerals.
This page provides mineralogical data about Protasite.

Classification of Protasite

Approved
4.GB.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
5.5.3.1

5 : OXIDES CONTAINING URANIUM OR THORIUM
5 : AX3O10·xH2O
7.16.14

7 : Oxides and Hydroxides
16 : Oxides of U
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Type Occurrence of Protasite

Year of Discovery:
1986

Physical Properties of Protasite

Sub-Adamantine
Colour:
Light Orange

Crystallography of Protasite

Crystal System:
Monoclinic
Cell Parameters:
a = 12.29Å, b = 7.22Å, c = 6.95Å
β = 90.4°
Ratio:
a:b:c = 1.702 : 1 : 0.963
Unit Cell Volume:
V 616.68 ų (Calculated from Unit Cell)

Optical Data of Protasite

Type:
Biaxial (-)
Dispersion:
r > v

Chemical Properties of Protasite

Formula:
Ba(UO2)3O3(OH)2 · 3H2O
Essential elements:
All elements listed in formula:

Relationship of Protasite to other Species

4.GB.05AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O
4.GB.05CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
4.GB.05RameauiteK2Ca(UO2)6(OH)16 · H2O
4.GB.10BecquereliteCa(UO2)6O4(OH)6 · 8H2O
4.GB.10BillietiteBa(UO2)6O4(OH)6 · 4-8H2O
4.GB.15RichetitePb(UO2)4O5 · 4H2O
4.GB.20BauranoiteBa(UO2)2(OH)6 · 1-2H2O
4.GB.20Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
4.GB.20Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
4.GB.25FourmarieritePb(UO2)4O3(OH)4 · 4H2O
4.GB.30Wölsendorfite(Pb,Ca)U2O7 · 2H2O
4.GB.35MasuyitePb(UO2)3O3(OH)2 · 3H2O
4.GB.40MetavandendriesscheitePbU7O22 · nH2O n < 12
4.GB.40VandendriesscheitePbU7O22 · 12H2O
4.GB.45VandenbrandeiteCu(UO2)(OH)4
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2O
4.GB.55CuritePb3(UO2)8O8(OH)6 · 3H2O
4.GB.60Iriginite(UO2)Mo2O7 · 3H2O
4.GB.65UranosphaeriteBi(UO2)O2(OH)
4.GB.70HolfertiteCaxU6+2-xTi(O8-xOH4x) · 3H2O
7.16.1UraniniteUO2
7.16.2Schoepite(UO2)8O2(OH)12 · 12H2O
7.16.3ParaschoepiteUO3 · 2H2O
7.16.4MetaschoepiteUO3 · 1-2H2O
7.16.5MetastudtiteUO4 · 2H2O
7.16.6Studtite[(UO2)(O2)(H2O)2] · H2O
7.16.7IanthiniteU4+(UO2)5O7 · 10H2O
7.16.8CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
7.16.9VandenbrandeiteCu(UO2)(OH)4
7.16.10RoubaultiteCu2(UO2)3(OH)10 · 5H2O
7.16.11BecquereliteCa(UO2)6O4(OH)6 · 8H2O
7.16.12RameauiteK2Ca(UO2)6(OH)16 · H2O
7.16.13AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O
7.16.15BillietiteBa(UO2)6O4(OH)6 · 4-8H2O
7.16.16BauranoiteBa(UO2)2(OH)6 · 1-2H2O
7.16.17Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
7.16.18Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
7.16.19OrthobranneriteU4+U6+Ti4O12(OH)2
7.16.20Thorutite(Th,U,Ca)Ti2(O,OH)6
7.16.21Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.22Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.23Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
7.16.24FourmarieritePb(UO2)4O3(OH)4 · 4H2O
7.16.25RichetitePb(UO2)4O5 · 4H2O
7.16.26CuritePb3(UO2)8O8(OH)6 · 3H2O
7.16.27MasuyitePb(UO2)3O3(OH)2 · 3H2O
7.16.28VandendriesscheitePbU7O22 · 12H2O
7.16.29MetavandendriesscheitePbU7O22 · nH2O n < 12
7.16.30SayritePb2(UO2)5O6(OH)2 · 4H2O
7.16.31Wölsendorfite(Pb,Ca)U2O7 · 2H2O
7.16.32Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
7.16.33UranosphaeriteBi(UO2)O2(OH)

Other Names for Protasite

Name in Other Languages:
German:Protasit
Spanish:Protasita

Other Information

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 Protasite

Reference List:
Mineralogical Magazine (1986): 50: 125-128.

Pagoaga, M.K., Appleman, D.E., and Stewart, J.M. (1987) Crystal structures and crystal chemistry of the uranyl oxide hydrates becquerelite, billietite, and protasite. American Mineralogist: 72: 1230-1238.

Burns, P.C. and Hanchar, J.M. (1999) The structure of masuyite, Pb[(UO2)3O3(OH)2](H2O)3, and its relationship to protasite. Canadian Mineralogist: 37: 1483-1491.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Protasite

Localities for Protasite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Democratic Republic of Congo (Zaïre) (TL)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Shinkolobwe
Amer.Min.(1987) 72, 1230-1238
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
Markl, G. & Slotta, C. (2011): Die Uranmineralien des Lagerstättenreviers Wittichen im mittleren Schwarzwald. Lapis 36 (3), 25-37; 54 (in German).
      • Wolfach
        • Oberwolfach
          • Rankach valley
Kolitsch, U. & Götzinger, M. (2000): Einige Neufunde aus der Grube Clara im mittleren Schwarzwald: Eulytin, Namibit, Volborthit, Gearksutit, Spertiniit, Monazit-(La), Protasit, Sainfeldit, Cyanotrichit und Vauquelinit. Erzgräber 14, 33-47. (in German)
Italy
 
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Giudicarie Valleys
        • Rendena Valley
          • Bocenago & Spiazzo
Campostrini I.(2013): Minerali secondari dei giacimenti uraniferi nelle Arenarie di Val Gardena del Trentino occidentale (Alpi Meridionali, Italia). Studi Trent. Sci. Nat., 93, pagg. 89-114.
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Chitinskaya Oblast'
        • Krasnokamensk
          • Strel'tsovskoe Mo-U ore field
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 46
Mineral and/or Locality  
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