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Mystery Hopper Octahedral Pseudomorph
  
  Index -> What is it? - Where is it from?
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Peter Megaw
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PostPosted: Nov 03, 2021 15:22    Post subject: Mystery Hopper Octahedral Pseudomorph  

An elderly neighbor recently gave me this interesting hoppered octahedral (?) pseudomorph. He was an industrial minerals geologist who specialized in sulfur, zeolites and evaporites, but doesn't remember where he got it or what he thought it was. This looks like a classic evaporite hopper "salt" crystal, but an octahedral habit is unusual for halite and maybe something like northupite is a more likely precursor. I am not certain it is truly octahedral as the axes are slightly unequal.

it's distinctive enough that I'm hoping someone recognizes the species and the locality.



20210901_125216.jpg
 Mineral: Uncertain
 Dimensions: 5 x 4 x 3.8 cm
 Description:
Fairly sharp hoppered pseudomorph after ?? from where??
 Viewed:  1215 Time(s)

20210901_125216.jpg



20210901_125202.jpg
 Mineral: unknown
 Description:
Fairly sharp hoppered pseudomorph after ?? from where??
 Viewed:  1218 Time(s)

20210901_125202.jpg



20210901_125226.jpg
 Description:
Fairly sharp hoppered pseudomorph after ?? from where??
 Viewed:  1216 Time(s)

20210901_125226.jpg



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Bob Carnein




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PostPosted: Nov 03, 2021 15:37    Post subject: Re: Mystery Hopper Octahedral Pseudomorph  

Did your neighbor travel to Africa? Maybe northupite from Lake Katwe, Uganda??
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