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Don Lum Collection
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Don Lum




Joined: 03 Sep 2012
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PostPosted: May 07, 2019 17:25    Post subject: Re: Don Lum Collection  

Bob Morgan wrote:
Looking through pics on mindat there are coatings of quartz and calcite. Yours looks like neither. The calcite coatings are of scalenahedral shaped crystals. Yours looks like simple rhombs.
Since both calcite and rhodochrosite are rhombohedral, I wouldn't rule out this simply being a rhodochrosite specimen.
It appears that the Oppu Mine produced both botryoidal and rather sharp crystals. Perhaps this is botryoidal overcoating of a prior generation of rhombs or three way blades.
'Just speculating. There's nothing really like yours on Mindat.



Bob,

Thank you for your idea. It looks like rhodochrosite on the bottom also. I see that Jordi agrees with your comment. I appreciate your taking the time to go through mindat and write me. I looked through mindat also and could not find anything that looked like this specimen either. This piece represents two generations of rhodochrosite.

Regards,

Don



P5021934 (2).JPG
 Mineral: Rhodochrosite
 Locality:
Oppu Mine, Nishimeya-mura, Naka-Tsugaru-gun, Aomori Prefecture, Tohoku Region, Honshu Island, Japan
 Dimensions: 15.2 cm x 11.7 cm x 4.7 cm
 Description:
Back of specimen posted on 05/02/2019. P5011921(2).jpg
 Viewed:  464 Time(s)

P5021934 (2).JPG



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Don Lum




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PostPosted: May 07, 2019 18:11    Post subject: Re: Don Lum Collection  

Elmwood


P5021948 (2).JPG
 Mineral: Calcite, Fluorite, Dolomite
 Locality:
Elmwood Mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith County, Tennessee, USA
 Dimensions: 21.5 cm x 11 cm x 10.5 cm
 Description:
Calcite, Micro Fluorite, Dolomite
 Viewed:  461 Time(s)

P5021948 (2).JPG



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Niels Brouwer




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PostPosted: May 07, 2019 18:46    Post subject: Re: Don Lum Collection  

Once again an impressive specimen that fits very well in your excellent quality collection, Don.

You can be quite sure that no baryte was harmed in the making of this pseudomorph. :D If it's indeed a pseudomorph in the first place, it would seem to be one after a trigonal mineral species or similar, which pretty much excludes baryte as a candidate.


Edit: I meant the rhodochrosite of course, I had overlooked the additional posts on this new page. Love the subtle purple of that Elmwood calcite too!
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Don Lum




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PostPosted: May 07, 2019 19:07    Post subject: Re: Don Lum Collection  

Niels Brouwer wrote:
Once again an impressive specimen that fits very well in your excellent quality collection, Don.

You can be quite sure that no baryte was harmed in the making of this pseudomorph. :D If it's indeed a pseudomorph in the first place, it would seem to be one after a trigonal mineral species or similar, which pretty much excludes baryte as a candidate.


Edit: I meant the rhodochrosite of course, I had overlooked the additional posts on this new page. Love the subtle purple of that Elmwood calcite too!



Thank you for your nice comment, Niels. I hope you are well.

Regards,

Don

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Tobi




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PostPosted: May 08, 2019 01:17    Post subject: Re: Don Lum Collection  

Niels Brouwer wrote:
Once again an impressive specimen that fits very well in your excellent quality collection, Don.
I have nothing to add :-)
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PostPosted: May 12, 2019 22:23    Post subject: Re: Don Lum Collection  

Tabular Quartz


P5121962 (2).JPG
 Mineral: Quartz
 Locality:
Montgomery County, Arkansas, USA
 Dimensions: 58 mm x 34 mm x 12 mm
 Description:
tabular quartz
 Viewed:  313 Time(s)

P5121962 (2).JPG



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Don Lum




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PostPosted: May 14, 2019 13:19    Post subject: Re: Don Lum Collection  

Amethyst


P5121951 (2).JPG
 Mineral: Quartz (variety amethyst)
 Locality:
Piedra Parada (Las Vigas), Municipio Tatatila, Veracruz (Veracruz de Ignacio de la Llave), Mexico
 Dimensions: 45 mm x 30 mm x 30 mm
 Description:
 Viewed:  214 Time(s)

P5121951 (2).JPG



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PostPosted: May 16, 2019 16:30    Post subject: Re: Don Lum Collection  

Smithsonite


P5121968 (2).JPG
 Mineral: Smithsonite
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 Dimensions: 18 mm x 18 mm x 13 mm
 Description:
 Viewed:  103 Time(s)

P5121968 (2).JPG



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