Orlandiite
A valid IMA mineral species
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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.
Unique Identifiers
Mindat ID:
7056
Long-form identifier:
mindat:1:1:7056:6
Similar Names
| Orlandinite | A synonym of Boulangerite |
IMA Classification of Orlandiite
Approved
IMA Formula:
Pb2+3Cl4(Se4+O3)·H2O
Approval year:
1998
Classification of Orlandiite
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ola | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Orlandiite
Vitreous, Silky
Transparency:
Translucent
Colour:
Colourless to white
Streak:
White
Tenacity:
Brittle
Cleavage:
Perfect
Perfect {010}
Perfect {010}
Density:
5.66 g/cm3 (Calculated)
Optical Data of Orlandiite
Type:
Biaxial
Dispersion:
strong
Comments:
n = 1.96(5)
Chemistry of Orlandiite
Mindat Formula:
Pb3(SeO3)(Cl,OH)4 · H2O
Element Weights:
Crystallography of Orlandiite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.136(3) Å, b = 8.430(6) Å, c = 9.233(7) Å
α = 62.58(7)°, β = 71.84(4)°, γ = 75.13(4)°
α = 62.58(7)°, β = 71.84(4)°, γ = 75.13(4)°
Ratio:
a:b:c = 0.965 : 1 : 1.095
Unit Cell V:
529.29 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Elongate tabular crystals.
Twinning:
Invariably twinned on {010}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005881 | Orlandiite | 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 |  | 2003 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.00 Å | (100) |
| 3.258 Å | (75) |
| 3.188 Å | (75) |
| 3.818 Å | (55) |
| 3.731 Å | (44) |
| 2.103 Å | (40) |
| 2.728 Å | (38) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
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
Associations Based on Photo Data:
| 3 photos of Orlandiite associated with Chalcomenite | CuSeO3 · 2H2O |
| 2 photos of Orlandiite associated with Sarrabusite | Pb5CuCl4(SeO3)4 |
| 1 photo of Orlandiite associated with Pseudoboleite | Pb31Cu24Cl62(OH)48 |
Related Minerals - Strunz-mindat Grouping
| 4.JH. | Magselite | [Mg(H2O)6](Se4+O3) |
| 4.JH. | Bernardevansite | Al2(SeO3)3 · 6H2O |
| 4.JH.05 | Chalcomenite | CuSeO3 · 2H2O |
| 4.JH.10 | Clinochalcomenite | CuSeO3(H2O)2 |
| 4.JH.10 | Ahlfeldite | Ni(SeO3) · 2H2O |
| 4.JH.10 | Cobaltomenite | CoSeO3 · 2H2O |
| 4.JH.15 | Mandarinoite | Fe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0) |
| 4.JH.30 | Nestolaite | CaSeO3 · H2O |
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.
Internet Links for Orlandiite
mindat.org URL:
https://www.mindat.org/min-7056.html
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References for Orlandiite
Reference List:
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. The Canadian Mineralogist, 37 (6) 1493-1498
Localities for Orlandiite
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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.
Argentina | |
| Grundmann et al. (2018) |
| Grundmann et al. (2018) |
Bolivia | |
| Alfredo Petrov specimen |
Germany | |
| Belendorff (2021) |
Italy (TL) | |
| [AmMin 85:1563] +2 other references |
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Baccu Locci Mine, Villaputzu, South Sardinia Province, Sardinia, Italy