Pyromorphite

Pyromorphite

In sufficient quantity, pyromorphite can be mined as an ore of lead.  It's chemical formula is Pb₅(PO₄)₃Cl.  This is a typical coloration for the mineral.  Apparently, this forms on the oxidation boundaries of lead.

Pyromorphite

This sample was obtained from Sherman Mine in Burke, Idaho.

Pyromorphite

Most of my information came from mindat.org

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Pyrochlore

Pyrochlore

The formula is (Na,Ca)₂Nb₂O₆(OH,F).  It usually has included radioactive elements which are not part of the chemical equation.

Pyrochlore

It is a member of the Pyrochlore group.  Pyrochlore typically contains .05% Uranium and Thorium.  Wikipedia does not mention practical uses but this seems the most likely possibility to me.

This sample was obtained from Oka, Quebec, Canada.

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