Class : Phosphates, arsenates, vanadates
    Subclass : Hydrated phosphates
    Crystal system : Orthorhombic
    Chemistry : NaCaCu₅(PO₄)₄Cl 5H₂O
    Rarity : Rare

Sampleite is a rare complex phosphate from the oxidation zone of copper deposits in arid climates ; it accompanies many secondary copper minerals. Very occasionally, it develops on the walls of caves, by reaction between copper sulfides and bat guano. It was named in honor of Mat Sample, who was for many years the superintendent for the Chile Exploration company of the Chuquicamata mine, the discovery deposit. Sampleite forms lamellar crystals not exceeding one centimeter, frequently gathered in rosettes or incrustations, of a beautiful light blue or blue-green to deep blue color.

Main photo : Sampleite from La Farola Mine, Atacama, Chile © Uwe Haubenreisser

Twinning is common.

No fakes listed for this mineral species.