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Kummerite

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SER1030129

Kummerite

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Description
Locality: 
Sapucaia Mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 2.1 × 1.8 cm
Description

This sample on sale was found by me on 2012 in the Sapucaia's dump. On 2019 this mineral was studyed and found to be a polymorph of kummerite. In 2019 a proposal was sent to IMA (IMA  2019-035) with the name varvelloite but, unfortunally, it was not approved. Later, in 2021, the name was changed to parakummerite as suggested by the Commission being it a polymorph of kummerite (IMA  2019-035a). This proposal was rejected too by the Commission because retained only an intermediate at half way between kastningite and kummerite like kummerite (half way in the series laueite-mangangordonite), ferrisicklerite (half way between triphylite and heterosite), and a lot of other accepted mineral species. The phosphate association includes also mangangordonite, cacoxenite and strengite.

 

Mineral Data
What's on the rock

Kummerite

Formula: 
Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O
Crystal System: 
Triclinic
Colour: 
Amber yellow
Streak: 
White
Type Locality: 
Cornelia Mine, Hagendorf, Bavaria, Germany
Isostructural with: 
Laueite

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Start 09 Apr 18:00
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