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22 Jul-17:21:23 Re: franjungle collection (Franjungle)
22 Jul-17:13:44 Re: don lum collection (Franjungle)
22 Jul-15:47:06 Re: don lum collection (Pierre Joubert)
22 Jul-13:56:45 Re: don lum collection (Don Lum)
22 Jul-13:32:55 Re: don lum collection (Pierre Joubert)
22 Jul-13:31:04 Re: quartz collecting outings in south africa (Pierre Joubert)
22 Jul-13:29:11 Re: don lum collection (Don Lum)
22 Jul-13:11:21 Re: collection of michael shaw (Crosstimber)
22 Jul-09:25:27 Re: quartz collecting outings in south africa (Bob Harman)
22 Jul-02:52:04 Re: the collection of pierre and riana joubert (Pierre Joubert)
21 Jul-13:30:18 Re: franjungle collection (Franjungle)
21 Jul-10:03:04 Re: quartz collecting outings in south africa (Pierre Joubert)
21 Jul-09:22:24 Re: collection of fiebre verde - cunas (#661) (Fiebre Verde)
21 Jul-09:16:21 Re: quartz collecting outings in south africa (Reinhardt Van Vuuren)
21 Jul-09:02:40 Re: quartz collecting outings in south africa (Heimo Hellwig)
21 Jul-08:36:04 Re: collection of michael shaw (Crosstimber)
21 Jul-03:58:59 Re: quartz collecting outings in south africa (Pierre Joubert)
21 Jul-03:57:24 Re: quartz collecting outings in south africa (Pierre Joubert)
21 Jul-03:43:22 Re: collection of heimo hellwig (Heimo Hellwig)
21 Jul-02:37:58 Re: collection of heimo hellwig (Pierre Joubert)
21 Jul-01:35:40 Re: collection of heimo hellwig (Heimo Hellwig)
21 Jul-00:06:54 Re: collection of philippe durand (Philippe Durand)
20 Jul-17:59:04 Re: a mineralogical trip through the states of usa - arizona (Jordi Fabre)
20 Jul-14:04:30 Re: collection of philippe durand (Don Lum)
20 Jul-13:57:37 Re: collection of michael shaw (Don Lum)

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Don Lum Collection
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Don Lum




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PostPosted: May 12, 2017 10:28    Post subject: Re: Don Lum Collection  

Pierre Joubert wrote:
Hi Don. Stunning quartz specimens with cookeite.Well done with acquiring them.


Thank you, Pierre. I have been enjoying the pictures of your collecting trips.

Hello to Riana.

Regards,

Don

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Don Lum




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PostPosted: May 14, 2017 16:09    Post subject: Re: Don Lum Collection  

Marcasite tubes


IMG_7254.JPG
 Mineral: Fluorite, Calcite, Marcasite
 Locality:
Annabel Lee Mine, Bethel level, Harris Creek Sub-District, Hardin County, Illinois, USA
 Dimensions: 220mm x 185mm x 47mm
 Description:
Marcasite tubes on Fluorite with Calcite
ex Les Tolonen
mined circa 1985-1986
 Viewed:  1645 Time(s)

IMG_7254.JPG



IMG_7257.JPG
 Mineral: Fluorite, Calcite, Marcasite
 Locality:
Annabel Lee Mine, Bethel level, Harris Creek Sub-District, Hardin County, Illinois, USA
 Dimensions: 220mm x 185mm x 47mm
 Description:
Marcasite tubes on Fluorite with Calcite
ex Les Tolonen
mined circa 1985-1986
 Viewed:  1637 Time(s)

IMG_7257.JPG



P5120844.JPG
 Mineral: Fluorite, Calcite, Marcasite
 Locality:
Annabel Lee Mine, Bethel level, Harris Creek Sub-District, Hardin County, Illinois, USA
 Dimensions: 220mm x 185mm x 47mm
 Description:
Marcasite tubes on Fluorite with Calcite
ex Les Tolonen
mined circa 1985-1986
 Viewed:  1640 Time(s)

P5120844.JPG



P5120833.JPG
 Mineral: Fluorite, Calcite, Marcasite
 Locality:
Annabel Lee Mine, Bethel level, Harris Creek Sub-District, Hardin County, Illinois, USA
 Dimensions: 220mm x 185mm x 47mm
 Description:
Marcasite tubes on Fluorite with Calcite
ex Les Tolonen
mined circa 1985-1986
 Viewed:  1637 Time(s)

P5120833.JPG



P5120836.JPG
 Mineral: Fluorite, Calcite, Marcasite
 Locality:
Annabel Lee Mine, Bethel level, Harris Creek Sub-District, Hardin County, Illinois, USA
 Dimensions: 220mm x 185mm x 47mm
 Description:
Marcasite tubes on Fluorite with Calcite
ex Les Tolonen
mined circa 1985-1986
 Viewed:  1648 Time(s)

P5120836.JPG



P5120840.JPG
 Mineral: Fluorite, Calcite, Marcasite
 Locality:
Annabel Lee Mine, Bethel level, Harris Creek Sub-District, Hardin County, Illinois, USA
 Dimensions: 220mm x 185mm x 47mm
 Description:
Marcasite tubes on Fluorite with Calcite
ex Les Tolonen
mined circa 1985-1986
 Viewed:  1646 Time(s)

P5120840.JPG



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alfredo
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PostPosted: May 15, 2017 07:14    Post subject: Re: Don Lum Collection  

As a fan of metallic minerals, I must say Don's Illinois marcasite tubes are spectacular and amazing! Something very similar is occasionally found at the Huanuni tin mine in Bolivia, but usually straight or with only milder curvatures. I wonder why they form like that and, if there is a simple explanation for their formation, why they are so uncommon?
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Jamison Brizendine




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PostPosted: May 15, 2017 11:00    Post subject: Re: Don Lum Collection  

That Annabel Lee Mine specimen is definitely an oddity and a sweet one at that!

I searched my 1988 Rocks and Minerals article on the district and there was this note:

"Marcasite occurs as reniform and stalactitic late-stage overgrowths on calcite and fluorite and as inclusions in fluorite, frequently in the color zones...A notable occurrence of marcasite was found in 1985 in the Annabel Lee Mine as twinned (marcasite) crystals (2 to 5 mm) intergrown with pyrite and coating yellow fluorite cubes (3 to 6 cm)" (Lillie, 1988).

Your specimen probably came from the Bethel Level.

References Cited:

Lillie, R. (1988) Minerals of the Harris Creek Fluorspar District, Hardin County, Illinois. Rocks and Minerals: 63(3): p. 224.
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Don Lum




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PostPosted: May 15, 2017 13:02    Post subject: Re: Don Lum Collection  

Jamison Brizendine wrote:
That Annabel Lee Mine specimen is definitely an oddity and a sweet one at that!

I searched my 1988 Rocks and Minerals article on the district and there was this note:

"Marcasite occurs as reniform and stalactitic late-stage overgrowths on calcite and fluorite and as inclusions in fluorite, frequently in the color zones...A notable occurrence of marcasite was found in 1985 in the Annabel Lee Mine as twinned (marcasite) crystals (2 to 5 mm) intergrown with pyrite and coating yellow fluorite cubes (3 to 6 cm)" (Lillie, 1988).

Your specimen probably came from the Bethel Level.

References Cited:

Lillie, R. (1988) Minerals of the Harris Creek Fluorspar District, Hardin County, Illinois. Rocks and Minerals: 63(3): p. 224.

Thank you for looking up the article, Jamison. Do you have any idea of the mechanism of the formation of the tubes? I had imagined an organic origin with replacement (mineralization) of the tubes with silica and/or marcasite. I found an article about tube worms in hot vents in the Pacific Ocean being replaced by minerals but I have no idea what happened in this specimen from Illinois. I will post that reference.

Regards,

Don

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Don Lum




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PostPosted: May 15, 2017 13:15    Post subject: Re: Don Lum Collection  

Alfredo and Jamison,

Please take a look at this article when you get a chance.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4359681/
(link normalized by FMF)

Regards,

Don

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Don Lum




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PostPosted: May 15, 2017 14:18    Post subject: Re: Don Lum Collection  

Don Lum wrote:
Alfredo and Jamison,

Please take a look at this article when you get a chance.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4359681/
(link normalized by FMF)

Regards,

Don

Other ideas: steady dripping of a saturated or supersaturated solutions like what Jamison mentioned, stalactitic growths. Or like the dripping of a candle. Or mineralization of a fungal rhizome. The reason that I don't think it is a steady drip is because the tubes change directions. As David Filby said in the Time Machine: One cannot choose, but wonder.

Don

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Don Lum




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PostPosted: May 15, 2017 14:50    Post subject: Re: Don Lum Collection  

I just received an email from Jared Freiburg with some information. I know he will not mind my sharing.

Hi Don-

Saw your post on FMF as I do my daily lurking. First off, photos are great! I've thought about this a lot in the past as my MS research locale had the occurrence of marcasite stalactites. They are most common in the Upper Mississippi Valley Pb-Zn District but found all around the fringe of the Illinois Basin. Although, very uncommon for the Illinois Fl District, I would imagine a similar mechanism for precipitation. The short and probably cheap answer is that these formed as a result of the reaction of iron (likely in the host rock sediments) and H2S formed through microbial sulfate reduction or thermochemical sulfate reduction. Either processes are likely associated with the generation of hydrocarbons during the “cooking” of organic rich shale that underlies the fluorspar host rocks. It is no surprise to find these precipitated over the early generation yellow that is often etched and also associated with an event of hydrocarbon (pyrobitumen) generation and migration. All in all more research is needed on the generation of marcasite stalactite (tubes) form. I think S isotopes of marcasite stalactites from different locales may help us better understand the mechanism of precipitation. All the fun papers I could do if I had time. J

Cheers

Survey_Logo
Jared T. Freiburg
Geologist
University of Illinois at Urbana-Champaign
615 East Peabody Dr., Champaign, IL 61820

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Don Lum




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PostPosted: May 15, 2017 18:01    Post subject: Re: Don Lum Collection  

Hello Jared,

Thanks for your insight about the Marcasite tubes. It's good to hear from you.

Regards,

Don

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PostPosted: May 18, 2017 12:26    Post subject: Re: Don Lum Collection  

Strontianite, Calcite


IMG_7261.JPG
 Mineral: Strontianite, Calcite
 Locality:
Minerva I Mine, Ozark-Mahoning group, Cave-in-Rock Sub-District, Hardin County, Illinois, USA
 Dimensions: 125mm x 100mm x 75mm
 Description:
 Viewed:  1175 Time(s)

IMG_7261.JPG



P5120856.JPG
 Mineral: Strontianite, Calcite
 Locality:
Minerva I Mine, Ozark-Mahoning group, Cave-in-Rock Sub-District, Hardin County, Illinois, USA
 Dimensions: 125mm x 100mm x 75mm
 Description:
 Viewed:  1177 Time(s)

P5120856.JPG



P5120857.JPG
 Mineral: Strontianite, Calcite
 Locality:
Minerva I Mine, Ozark-Mahoning group, Cave-in-Rock Sub-District, Hardin County, Illinois, USA
 Dimensions: 125mm x 100mm x 75mm
 Description:
 Viewed:  1175 Time(s)

P5120857.JPG



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Carles Millan
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PostPosted: May 18, 2017 13:24    Post subject: Re: Don Lum Collection  

Really nice strontianite, Don. I love the pyramidal habit and the flower-like groups. By the way, which are the calcite crystals?
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PostPosted: May 18, 2017 13:54    Post subject: Re: Don Lum Collection  

Carles Millan wrote:
Really nice strontianite, Don. I love the pyramidal habit and the flower-like groups. By the way, which are the calcite crystals?


The Strontianite are the acicular crystals, some in bow-tie arrangement. Are you suggesting that there is no calcite present, Carles?

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PostPosted: May 18, 2017 14:19    Post subject: Re: Don Lum Collection  

The calcites are the larger, whiter crystals, aren't they?
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PostPosted: May 18, 2017 14:24    Post subject: Re: Don Lum Collection  

alfredo wrote:
The calcites are the larger, whiter crystals, aren't they?


Alfredo, you are correct. The larger whiter crystals look like dogtooth calcite.

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PostPosted: May 18, 2017 14:26    Post subject: Re: Don Lum Collection  

To be sure a chemical analysis would be needed.
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PostPosted: May 18, 2017 14:45    Post subject: Re: Don Lum Collection  

Carles Millan wrote:
To be sure a chemical analysis would be needed.


Carles,

I disagree. This is a classic association from the Minerva Mine. A simple drop of HCL will confirm the calcite.
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PostPosted: May 18, 2017 14:55    Post subject: Re: Don Lum Collection  

Doesn't strontianite fizz with acid too?
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PostPosted: May 18, 2017 14:59    Post subject: Re: Don Lum Collection  

crosstimber wrote:
Carles Millan wrote:
To be sure a chemical analysis would be needed.
Carles, I disagree. This is a classic association from the Minerva Mine. A simple drop of HCL will confirm the calcite.

The strontianite also reacts with HCl. It's a carbonate like calcite. And strontium is a metal chemically very close to calcium.

Whether it is a typical combination of Minerva mine is another story. I'm not going to argue about such statement.
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PostPosted: May 18, 2017 15:00    Post subject: Re: Don Lum Collection  

alfredo wrote:
Doesn't strontianite fizz with acid too?


Yes, Alfredo, strontianite will fizz with acid. But the larger scalenohedral crystals associated with the strontianite are clearly calcite. Minerva Mine strontianites tend to form curved crystal aggregates which are shown nicely in Don's photo.
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PostPosted: May 18, 2017 15:59    Post subject: Re: Don Lum Collection  

Thank you Michael, Alfredo, and Carles. All I can say with certainty is that no hydrochloric acid will touch this specimen as long as it is in my collection. ;-)

Don

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