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About OrlandiiteHide

Pb3(SeO3)(Cl,OH)4 · H2O
Colourless to white
Vitreous, Silky
Specific Gravity:
5.66 (Calculated)
Crystal System:
Named by I. Campostrini, C.M. Gramaccioli, and F. Demartin in 1999 in honor of Paolo Orlandi (b.1946), Italian mineralogist, University of Pisa, Italy. He has described several new minerals.
This page provides mineralogical data about Orlandiite.

Classification of OrlandiiteHide

Approval Year:

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
H : Selenites without additional anions, with H2O

Physical Properties of OrlandiiteHide

Vitreous, Silky
Colourless to white
5.66 g/cm3 (Calculated)

Optical Data of OrlandiiteHide


Chemical Properties of OrlandiiteHide

Pb3(SeO3)(Cl,OH)4 · H2O
IMA Formula:
Pb3Cl4(Se4+O3) · H2O

Crystallography of OrlandiiteHide

Crystal System:
Elongate tabular crystals.
Invariably twinned on {010}.

Type Occurrence of OrlandiiteHide

Place of Conservation of Type Material:
University of Milan, Milan, Italy.
Geological Setting of Type Material:
Selenium-rich oxidized zone of a hydrothermal ore deposit.
Associated Minerals at Type Locality:

Synonyms of OrlandiiteHide

Other Language Names for OrlandiiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Chalcomenite1 photo of Orlandiite associated with Chalcomenite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.JH.05ChalcomeniteCuSeO3 · 2H2OOrth. 2 2 2 : P21 21 21
4.JH.10AhlfelditeNi(SeO3) · 2H2OMon. 2/m
4.JH.10ClinochalcomeniteCuSeO3 · 2H2OMon.
4.JH.10CobaltomeniteCoSeO3 · 2H2OMon.
4.JH.15MandarinoiteFe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0)Mon. 2/m : P21/b
4.JH.25LarisaiteNa(H3O)(UO2)3(SeO3)O2 · 4H2OMon. m : Pm

Fluorescence of OrlandiiteHide

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 OrlandiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Campostrini, I., Gramaccioli, C.M., Demartin, F. (1999) Orlandiite, Pb3Cl4(SeO3)3•H2O, a new mineral species, and an associated lead-copper selenite chloride from the Baccu Locci mine, Sardinia, Italy, Canadian Mineralogist: 37: 1493-98.
Demartin, F., Gramaccioli, C.M., Pilati, T. (2003) The crystal structure of orlandiite, Pb3Cl4(SeO3)·H2O, a complex case of twinning and disorder. The Canadian Mineralogist: 41: 1147-1153.

Internet Links for OrlandiiteHide

Localities for OrlandiiteHide

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.
Italy (TL)
  • Sardinia
    • South Sardinia Province
      • Sarrabus-Gerrei
        • Gerrei
          • Villaputzu
Campostrini, I., Gramaccioli, C. M. and Demartin, F. (1999): Orlandiite, Pb3Cl4(SeO3)3•H2O, a new mineral species, and an associated lead-copper selenite chloride from the Baccu Locci mine, Sardinia, Italy. Can. Mineral. 37, 1493-1498; [AmMin 85:1563]; Campostrini, I. & Gramaccioli, C. M. (2001): Selenium-rich secondary minerals from the Baccu Locci mine (Sardinia, Italy). Neues Jahrbuch fuer Mineralogie, Abhandlungen 177, 37-59.
Mineral and/or Locality  
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