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Columnar Marcasite
  
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John Betts




Joined: 07 Jun 2012
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PostPosted: Jan 17, 2019 19:45    Post subject: Columnar Marcasite  

I need help identifying the origin of a 28 mm stalactitic formation of marcasite (or possibly pyrite, though the crystals are wedge-shaped which is typical of marcasite).

The rear is coated with colorless quartz crystals to 0.5 mm.

It is not typical of specimens from the Buick Mine in Missouri because the marcasite crystals on this specimen are oriented in the same plane (not random as would be expected from the Buick Mine).

Any help with the locality will be greatly appreciated.



pyrite-marcasite.jpg
 Mineral: marcasite
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pyrite-marcasite.jpg



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Kevin Conroy




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PostPosted: Jan 17, 2019 22:47    Post subject: Re: Columnar Marcasite  

Hi John,

Although the marcasite crystals are aligned, which is very rare for the mining district, I do think that this is from the Viburnum Trend. Without any matrix present I'm not going to be able to pin this down to a certain mine. I can tell you that the marcasite stalactites with preferentially deposited druse quartz are/were only found in the northern part of the Trend. So, Buick, Magmont, Casteel, Viburnum #27, Viburnum #28 and Viburnum #29 mines are all possibilities. It's also possible that this could be from Indian Creek or Goose Creek mine (outliers of the Viburnum Trend, both in Washington County) but specimens from these mines are scarce, and I've never seen a marcasite stalactite from either.

Kevin
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John Betts




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PostPosted: Jan 18, 2019 11:32    Post subject: Re: Columnar Marcasite  

Thanks Kevin. It is from an old collection assembled in the 1960s-1970s. Sadly, it lost it's label somewhere along the way.Though labeling back then might have just said "Missouri."
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