PYROMORPHITE (DES MILLIERS DE CRISTAUX VERT VIF) (grande armoire)
PYROMORPHITE (DES MILLIERS DE CRISTAUX VERT VIF) (grande armoire)
La pyromorphite est un minéral composé de chlorophosphate de plomb, de formule Pb₅(PO₄)₃Cl, et se trouve en quantité suffisante pour être extraite comme minerai de plomb. Elle forme généralement des cristaux prismatiques hexagonaux, souvent coiffés de plans basaux et présentant parfois d'étroites faces pyramidales hexagonales. On trouve également des cristaux en forme de tonneau, ainsi que des agrégats globulaires et réniformes. Appartenant au groupe des apatites, la pyromorphite ressemble beaucoup à la mimétite (Pb₅(AsO₄)₃Cl) et à la vanadinite (Pb₅(VO₄)₃Cl) par ses propriétés physiques et chimiques, ce qui rend leur distinction difficile sans analyse chimique.
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