Plumbogummite

Plumbogummite is a rare secondary lead phosphate mineral, belonging to the alunite supergroup of minerals.The basic structural units of plumbogummite are PO4 tetrahedra, with phosphorus atoms at the center and oxygen atoms at the corners, together with AlO6 octahedra, aluminium atoms (Al) at the center and oxygen atoms at the corners. The tetrahedra and octahedra combine by sharing corners, to form composite layers. Lead atoms (Pb) occupy sites between the layers.

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Plumbogummite-01 - Yangshuo Mine China
Here is a nice sample of blue Plumbogummite associated with yellow Pyromorphite from the Yangsh..
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Plumbogummite-02 - Yangshuo Mine China
Plumbogummite on Pyromorphite (yellow) from the Yangshuo mine, Yangshuo Co., Guilin Prefecture,..
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