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Analytical investigations - galloplumbogummite in a different habit!

EDS confirmed galloplumbogummite spheres (pictures 1-5; picture no. can be seen by mouse overlay on the pictures below) in germanite renierite ore, accompanied by otjisumeite needles (pictures 8-10), unknown bright phase (lead phospate without Cl, picture 9), and stolzite (picture 11).

This sample shows, that only the chemical environment determines whether it is plumbogummite or galloplumbogummite. Several similar looking spheres in a germanite/renierite matrix, where other Ge/Ga minerals are absent, were "only" plumbogummite.

Older material with confirmed galloplumbogummite had a different crystal habit (pictures 6-7) and was accompanied by tsumcorite in flat cracks in germanite ore.

Mineral references: 
Locality references: 
Album: 
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!
Album: Analytical investigations - galloplumbogummite in a different habit!

Comments

Submitted by jeyjey on
The unknown lead phosphate could be Hydroxylpyromorphite, yet not listed from Tsumeb. As Cl is substituted by OH it might be more common, than the number of localities given for that species.