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Turbo
Joined: 30 Sep 2009
Posts: 260
Location: Delaware
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 Posted: Jan 03, 2015 17:22 Post subject: Re: Mineral Display Case Project. |
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| rfarrar wrote: | Nice looking cabinet and display. You have some great calcites. I would be concerned that the Homestake Mine calcite might be mis-labelled. I know of no calcites of this habit from the Homestake Mine, Lawrence Co., SD in the SDSM&T collection or the Black Hills Institute collection. What is the matrix? Most of those from the Homestake have a little phyllite or cummingtonite- gruenerite schist on the back. Homestake Mining Corporation has (had) mines in many states, most referred to locally as the Homestake Mine. Perhaps this one got attributed to the wrong state somewhere along the line.
Bob |
Hi,
You would know SD material better than me. It appears to have been acid dipped. The crystal edges are rounded aggressively. I've attached pictures of the matrix. Looks like it could be chert?
Ed
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rfarrar
Joined: 04 Mar 2012
Posts: 5
Location: South Dakota
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| Posted: Jan 03, 2015 19:01 Post subject: Re: Mineral Display Case Project |
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Ed,
The SD Homestake is a preCambrian metamorphic deposit. Perhaps this came from a Homestake owned mine in the Tri-State or New Lead Belt of Missouri.
Bob
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2089
Location: Oklahoma
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| Posted: Jan 04, 2015 16:05 Post subject: Re: Mineral Display Case Project |
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Ed,
I believe Bob is right in thinking that the Homestake Mine piece is from the Tri-State District. The chert matrix is a dead giveaway, and a high percentage of calcite specimens from there were acid dipped to increase their luster. There is a Homestake Mine in the Granby Field of the Tri-State District, Newton County Missouri. I'll bet that's where this specimen is from.
Michael
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Turbo
Joined: 30 Sep 2009
Posts: 260
Location: Delaware
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| Posted: Jan 04, 2015 17:25 Post subject: Re: Mineral Display Case Project |
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I agree. It's probably from the Tri State District. I will have to change the label.
Thanks!
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Martin Rich
Joined: 15 Aug 2013
Posts: 127
Location: Lower Austria
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| Posted: Jan 06, 2015 22:37 Post subject: Re: Mineral Display Case Project |
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This is a very, very nice display and as a fan of calcite I like all your specimens.
Martin
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keith compton
Joined: 04 Feb 2015
Posts: 3
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| Posted: Feb 18, 2015 23:16 Post subject: Re: Mineral Display Case Project |
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Hi Turbo
Well done on the construction of the case, and you have some great calcite specimens.
My only suggestion would be to consider using some form of base for the minerals - the glass can scratch easily, particularly with the heavier pieces. You can get perspex cut to size - very little cost - no need for expensive custom made bases. Other material includes felt, flat cork sheet - easily cut to size, black painted wood (even balsa wood).
On the labels I note the use of a comma at the end of the first line - not needed.
Well done
Cheers
Keith
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Turbo
Joined: 30 Sep 2009
Posts: 260
Location: Delaware
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| Posted: Feb 19, 2015 12:29 Post subject: Re: Mineral Display Case Project |
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Hi,
They all have custom bases I either made myself with plaster or acrylic with felt feet. Some just have felt feet. I hid the bases as best I could and painted them to color of matrix. So none of the minerals actually touch the glass!
Best,
Ed
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Turbo
Joined: 30 Sep 2009
Posts: 260
Location: Delaware
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| Posted: Jun 17, 2015 21:26 Post subject: Re: Mineral Display Case Project. |
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Another label that I'm curious about possibly needing a change is the calcite (DSC_1679.JPG) pictured that was said to be from Brushy Creek Mine. It may be No. 29 Mine, but I'd need more corroboration. It has a form that somewhat deviates from the typical brushy creek. The form is similar to those from No. 28 Mine, except that it is gray. I've seen one identical gray crystal labeled No. 29 Mine.
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Jun 17, 2015 21:48 Post subject: Re: Mineral Display Case Project |
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| 29 is correct. These were mined maybe 15 years or so ago by a contractor, Mark Kielbaso, I believe. He could probably tell you the drift it was collected in. His contact is through Mindat or his webite (google his name).
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Turbo
Joined: 30 Sep 2009
Posts: 260
Location: Delaware
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| Posted: Jun 18, 2015 18:56 Post subject: Re: Mineral Display Case Project |
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| Mark has confirmed it is a No. 29 specimen. Exciting news! Thanks!
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