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About PiretiteHide

Ca(UO2)3(SeO3)2(OH)4 · 4H2O
Crystal System:
For Dr. Paul Piret (born Tournai, Belgium May 13th 1932 and passed away in Ottignies, Belgium on March 22nd 1999), Professor of Crystallography, University of Louvain-la-Neuve, Belgium. Described about 30 new mineral species, in co-authorship with Michel Deliens.
This page provides mineralogical data about Piretite.

Classification of PiretiteHide


4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
J : Selenites with additional anions, with H2O

Physical Properties of PiretiteHide

Transparent, Translucent
Pale yellow
2½ on Mohs scale

Optical Data of PiretiteHide

Biaxial (-)
RI values:
nα = 1.540 nβ = 1.730 nγ = 1.750
Measured: 33° , Calculated: 32°
Max Birefringence:
δ = 0.210
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of PiretiteHide

Ca(UO2)3(SeO3)2(OH)4 · 4H2O
IMA Formula:
Ca(UO2)3(Se4+O3)2(OH)4 · 4H2O

Crystallography of PiretiteHide

Crystal System:
Cell Parameters:
a = 7.010(3) Å, b = 17.135(7) Å, c = 17.606(4) Å
a:b:c = 0.409 : 1 : 1.027
Unit Cell V:
2,114.77 ų (Calculated from Unit Cell)
Space group is Pmnm or Pmn21

Type Occurrence of PiretiteHide

Place of Conservation of Type Material:
Royal Belgian Institute of Natural Sciences, Brussels

Synonyms of PiretiteHide

Other Language Names for PiretiteHide


Related Minerals - Nickel-Strunz GroupingHide

4.JJ.05MarthoziteCu2+(UO2)3(SeO3)2O2 · 8H2OOrth.
4.JJ.10GuilleminiteBa(UO2)3(SeO3)2O2 · 3H2OOrth. mm2 : Pmn21
4.JJ.20DemesmaekeritePb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2OTric.
4.JJ.25Haynesite(UO2)3(OH)2(SeO3)2 · 5H2OOrth.

Other InformationHide

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 PiretiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Record: 28: 404.
Vochten, R., Blaton, N., Peeters, O., Deliens, M. (1996) Piretite,
Ca(UO2)3(SeO3)2(OH)4•4H2O, a new calcium uranyl selenite from Shinkolobwe, Shaba, Zaire. Canadian Mineralogist: 34: 1315–1322.

Internet Links for PiretiteHide

Localities for PiretiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
  • Olomouc Region
    • Jeseník District
      • Javorník
In the collection of Brent Thorne. Acquired from Systematica minerals. Analyzed by Dr. Jakub Plasil.
DR Congo (TL)
  • Haut-Katanga
    • Kambove District
      • Shinkolobwe
Can Min (1996), 34 (6), p. 1317
Mineral and/or Locality  
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