Orlandiite
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About Orlandiite
Formula:
Pb3(SeO3)(Cl,OH)4 · H2O
Colour:
Colourless to white
Lustre:
Vitreous, Silky
Specific Gravity:
5.66 (Calculated)
Crystal System:
Triclinic
Name:
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 Orlandiite
Approved
Approval Year:
1998
4/K.01-30
4.JH.20
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
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 Orlandiite
Vitreous, Silky
Transparency:
Translucent
Colour:
Colourless to white
Streak:
White
Tenacity:
Brittle
Density:
5.66 g/cm3 (Calculated)
Optical Data of Orlandiite
Type:
Biaxial
Dispersion:
strong
Chemical Properties of Orlandiite
Formula:
Pb3(SeO3)(Cl,OH)4 · H2O
IMA Formula:
Pb3Cl4(Se4+O3) · H2O
Crystallography of Orlandiite
Crystal System:
Triclinic
Morphology:
Elongate tabular crystals.
Twinning:
Invariably twinned on {010}.
Type Occurrence of Orlandiite
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 Orlandiite
Other Language Names for Orlandiite
Common Associates
Associated Minerals Based on Photo Data:
| Chalcomenite | 1 photo of Orlandiite associated with Chalcomenite on mindat.org. |
Related Minerals - Nickel-Strunz Grouping
| 4.JH.05 | Chalcomenite | CuSeO3 · 2H2O | Orth. 2 2 2 : P21 21 21 |
| 4.JH.10 | Ahlfeldite | Ni(SeO3) · 2H2O | Mon. 2/m |
| 4.JH.10 | Clinochalcomenite | CuSeO3 · 2H2O | Mon. |
| 4.JH.10 | Cobaltomenite | CoSeO3 · 2H2O | Mon. |
| 4.JH.15 | Mandarinoite | Fe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0) | Mon. 2/m : P21/b |
| 4.JH.25 | Larisaite | Na(H3O)(UO2)3(SeO3)O2 · 4H2O | Mon. m : Pm |
Fluorescence of Orlandiite
None.
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 Orlandiite
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 Orlandiite
mindat.org URL:
https://www.mindat.org/min-7056.html
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Localities for Orlandiite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| 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. |
Baccu Locci Mine, Villaputzu, Gerrei, Sarrabus-Gerrei, South Sardinia Province, Sardinia, Italy