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Locality for sphalerite and white mineral
  
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Pete Richards
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PostPosted: Nov 02, 2023 13:28    Post subject: Locality for sphalerite and white mineral  

Here is an old specimen, probably 19th century, of sphalerite and a white mineral. There are two specimens in the collection with catalog number 2260, reportedly from Joplin, Missouri. However, the two specimens look very different, so I somewhat distrust the locality attribution.

This specimen features dark brown sphalerite with incomplete balls of a white, elongated mineral that I am assuming is barite. The white mineral began growing after some sphalerite was already deposited on the brownish matrix (weathered limestone?)

Can anyone offer a definite attribution of a locality? Can anyone verify the identity of the white ball-forming mineral?



IMG_7854.JPG
 Mineral: Sphalerite and ?
 Dimensions: 7 x 8 cm
 Description:
Top view of specimen
 Viewed:  3039 Time(s)

IMG_7854.JPG



IMG_7849.jpg
 Description:
Back side of specimen - matrix
 Viewed:  3025 Time(s)

IMG_7849.jpg



IMG_7874.JPG
 Description:
Side view. Matrix toward bottom. Shows a band of sphalerite before nucleation and growth of white mineral.
 Viewed:  3009 Time(s)

IMG_7874.JPG



IMG_7896.JPG
 Description:
Another side view.
 Viewed:  2992 Time(s)

IMG_7896.JPG



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PostPosted: Nov 02, 2023 16:29    Post subject: Re: Locality for sphalerite and white mineral  

Dan, one of the foremost experts in Missouri minerals, assist us:

Dan Weinrich wrote:

Sure looks like barite/sphalerite from somewhere here in the middle U.S. It could be from Missouri, though normally one doesn’t see sphalerite like that with the barite, only galena. But I suppose that it is possible. Looks like a really old specimen and could have come from most any small surficial deposit. There are/were a lot of them throughout the state.

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