Orlandiite
Orlandiite is an IMA-recognized mineral species in the halide class, with the chemical formula Pb₃Cl₄(Se⁴⁺O₃)·H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 5.66; Vitreous to silky luster.
IMA symbol Ola, IMA status: approved, named in 1998.
Found in the oxidized zone of a hydrothermal base-metal deposit, in a selenium-rich part.
It is found associated with Chalcomenite, atacamite, pseudoboléite, chlorargyrite.
The mineral was named to honor Paolo Orlandi (1946–), Professor of Mineralogy, University of Pisa, Pisa, Italy, who has described a variety of new minerals from Italy.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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