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PhotosCalcite - Joplin Field, Tri-State District, Jasper Co., Missouri, USA

1st Oct 2017 00:25 UTCStephen C. Blyskal Expert

Calcite, Pyrite, Galena

Viburnum Trend Mining District, Missouri, USA

Classic Sweetwater Mine crystal, from the Viburnum Trend on the eastern side of Missouri. I see this mistake all the time. There are very clear differences between the Tri-State and Viburnum Trend calcites, but it takes looking at several 100 of each before they are clear. I have collected crystals from both sites since the 1970s.

1st Oct 2017 03:21 UTCKevin Conroy Manager

I agree, this is definitely from the Viburnum Trend.

1st Oct 2017 17:45 UTCEdward Bayley

I agree it is Viburnum Trend, although I am not 100% that it is Sweetwater, but it would be my best guess.

1st Oct 2017 19:47 UTCStephen C. Blyskal Expert

So how do we get the admins to change these locations?

1st Oct 2017 22:40 UTCEdward Bayley

I guess one way is PM the person who uploaded them and refer them to the message board. If they agree with the consensus, they can change it.

1st Oct 2017 22:41 UTCRob Woodside 🌟 Manager

That's what we are supposed to do but any help is much appreciated.

Looking at them they seem to be dealer photos, some of whom have given us permission to do what we want with the photos. They are busy people. So I'll get to work now.

Arghh!!! Some clever person has separated all the "Viburum Trend" into Missouri Counties. So if you tell me which county these all come from I'll be happy to fix them. Should we have a "Viburnum Trend, Missouri, USA" locality for those whose Counties are unknown?

2nd Oct 2017 01:23 UTCDoug Daniels

Rob-

A generic "Viburnum Trend, Missouri, USA" might be a good idea. I remember back when such specimens started showing up, that often the only location was "Viburnum Trend". I think that's what most of my specimens from there have, much to my consternation. Kinda like the Tri-State District as a location (and of which I have a few specimens).

2nd Oct 2017 02:19 UTCKevin Conroy Manager

I don't remember ever seeing a lustrous golden yellow calcite from the northern or middle parts of the Trend, so these are almost certainly from Reynolds County. Sweetwater Mine is where most of the crystals like this are from but West Fork and Fletcher Mines also produced some.

2nd Oct 2017 04:25 UTCDoug Daniels

Which is why a generic location may be needed for some - based on a photo, and the color of the specimen, and so forth, you can't magically come up with which mine it came from. Wish it was so easy for many of my specimens (not just calcites).

2nd Oct 2017 07:18 UTCKeith Compton 🌟 Manager

Hi

Photo (mindat ID 695190) is a dealer photo. The specimen was previously owned by a European collector. No prior labels to that of the European collector and the Fabre label.

As I now have the specimen - I'm ok with it being labeled Viburnum trend district, particularly as I am no expert on this area or the Joplin field.

The Calcite is definitely on Dolostone and with Chalcopyrite and a single octahedral Galena xl.

Having said that and viewing some of the other "questionable" specimens, are people questioning them based on what has come out recently? These appear to be "older" specimens and the styles may have been different in earlier times as is often the case with mine development. Just asking.

Cheers

Keith

2nd Oct 2017 16:43 UTCKevin Conroy Manager

An easy way to tell Tri-State from Viburnum Trend specimens is the matrix. Chert = Tri-State, dolostone = Trend. There are some exceptions from the Tri-State of course, but I've never seen chert in the Trend.

The crystal habits for the calcite (and for that matter the galena, sphalerite and chalcopyrite) are also different for the two districts. Sometimes the differences are a little subtle, but when looking closely at them the differences are pretty clear.

As for the Trend, there were several periods of deposition, all moved generally from south to north. The theory goes that as mineral deposition took place the fluids changed (it's about 30 miles from the south to north ends of the Trend, 50 miles if you include the Indian Creek outlier). In general this is why the minerals from the south end of the Trend are more lustrous than those at the north end. There are definitely exceptions to this! Also, generally the quartz crystals are larger, while the dolomite crystals are smaller and aren't as white, toward the north end. This has pretty much been the case throughout the history of the Trend.

2nd Oct 2017 17:20 UTCEdward Bayley

Kevin,

There is also no sphalerite in the Trend, correct? Casteel produced some bright yellow gemmy specimens this year, but not with the same habit as the above photo. That find was an aberration for Casteel.

Keith,

I question specimens based on the totality of what I've seen from both districts, not on recent material. It's hard to date material from the Trend since some recent stuff looks like stuff from the 70s and 80s.

Best,

Ed Bayley

2nd Oct 2017 19:15 UTCKevin Conroy Manager

Sphalerite has been found in several mines in the Trend. It ranges from gemmy yellowish-green to opaque black. The crystals tend to be pretty small, a large one would be 6 mm.

5th Oct 2017 22:20 UTCRob Woodside 🌟 Manager

Now There is a pan county Viburnam Trend https://www.mindat.org/loc-296167.html?cacheclear=1 in addtion to the county split in Viburnam Trend District

https://www.mindat.org/loc-3870.html

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