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Pyromorphite
Apatite group - phosphates
Formule chimique :
Pb5(PO4)3Cl
Système cristallin :
hexagonal
Etymologie :
From the Greek pyros meaning fire and morpho meaning form.
Dureté :
3.5 – 4
Densité :
6.5 – 7.1
Propriétés physiques :
Resinous sheen. Colour from yellow to brown, green. Translucent. Any fracture. Cleavage according to (1010) poor.
Propriétés chimiques :
It is the phosphorus (P) pole of the pyromorphite - mimetite - vanadinite series. It is soluble in nitric acid.
Formule chimique :
Pb5(PO4)3Cl
Habitus :
In hexagonal prismatic crystals, sometimes barrel-shaped or cavernous.
Gîtologie :
Pyromorphite is an alteration mineral of lead deposits.
Determination :
Relatively easy due to habitus and colour.
Utilisation :
No significant use
Pyromorphite is found in often cavernous crystals as a secondary mineral in oxidised Pb deposits. In France, it is found at Farges (Corrèze), Ally (Haute-Loire), Pontgibaud (Puy de Dôme), Beaujeu (Rhône), Huelgoat (Finistère),…
Beautiful crystals come from Germany, Czech Republic, Russia, USA, Australia, Austria and the UK.
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