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24 May-10:47:29 Re: don lum collection (Don Lum)
23 May-13:15:37 Re: collection of michael shaw (Crosstimber)
23 May-12:58:36 Re: rhodochrosite argentina (Mathias)
23 May-10:21:32 Re: rhodochrosite argentina (Kevin Schofield)
23 May-09:21:20 Re: franjungle collection (Firmo Espinar)
23 May-08:55:30 Re: new generation for picture - ploum (Ploum)
23 May-02:57:06 Re: rhodochrosite argentina (Jordi Fabre)
23 May-01:22:49 Re: collection of michael shaw (Tobi)
23 May-01:20:56 Re: don lum collection (Tobi)
23 May-01:17:17 Re: rhodochrosite argentina (Tobi)
22 May-15:25:33 Re: rhodochrosite argentina (Condoragatemines)
22 May-14:59:26 Re: new generation for picture - ploum (Ploum)
22 May-13:25:06 Re: new generation for picture - ploum (Jose Luis Jara Jara)
22 May-12:45:31 Re: new generation for picture - ploum (Ploum)
22 May-11:49:57 Re: collection of enrique llorens (Enrique Llorens)
22 May-10:13:34 Re: don lum collection (Don Lum)
22 May-09:19:34 Re: collection of michael shaw (Crosstimber)
22 May-08:41:03 Re: don lum collection (Crosstimber)
22 May-07:26:31 Re: new generation for picture - ploum (Ploum)
22 May-07:03:51 Re: collection of annemieke en rob schnerr (Rob Schnerr)
21 May-22:12:15 Re: rock id help (Fuss)
21 May-18:25:37 Re: don lum collection (Don Lum)
21 May-13:06:37 Re: new generation for picture - ploum (Jose Luis Jara Jara)
21 May-12:48:44 Re: new generation for picture - ploum (Ploum)
21 May-09:06:29 Re: are there any sicilian sulphur fakes still around? (Kevin Conroy)

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Don Lum Collection
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Tobi




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PostPosted: Apr 15, 2019 01:09    Post subject: Re: Don Lum Collection  

Wonderful specimens as usual, Don, both the aquamarine and the bastnäsite.
Any idea how and why these hollow (?) tubes in the aquamarine crystal develop?
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Don Lum




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PostPosted: Apr 15, 2019 11:56    Post subject: Re: Don Lum Collection  

Tobi wrote:
Wonderful specimens as usual, Don, both the aquamarine and the bastnäsite.
Any idea how and why these hollow (?) tubes in the aquamarine crystal develop?


Tobi, I have wondered about these tubes myself but do not know how or why they form. Some of these tubes are filled with liquid. I believe some of the FMF members can enlighten us. Thanks for the great question. Sorry I don't have an answer for you.

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Don

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Kevin Conroy




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PostPosted: Apr 15, 2019 14:59    Post subject: Re: Don Lum Collection  

The following is from: Dissolution Behaviour of Beryl, vorgelegt von MSc. Geology, Raji Kurumathoor Parameshwaran, geb. in Taliparamba, Kerala, India, on page 101:

"The study of inclusions is widely used by the gemmologists to recognise natural gem stones from the synthetic ones. Because of the fluids used in the synthesis of most gems in the laboratory usually are quite unlike those present in nature (Roedder, 1982). The inclusions manifest the identifying characteristics of the pegmatitic growth process. Aquamarine is often traversed by fine growth tubes parallel to c-axis in concurrence with the structural peculiarities of beryl having hollow channels between silicate rings (Gübelin, 1953). These inclusions known as "rain" are used as a positive identification of aquamarine by gemmologists. According to Gübelin, 1953, the beryl structure causes the development of growth tubes either hollow or filled with foreign substances. "
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Don Lum




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PostPosted: Apr 15, 2019 15:44    Post subject: Re: Don Lum Collection  

Kevin Conroy wrote:
The following is from: Dissolution Behaviour of Beryl, vorgelegt von MSc. Geology, Raji Kurumathoor Parameshwaran, geb. in Taliparamba, Kerala, India, on page 101:

"The study of inclusions is widely used by the gemmologists to recognise natural gem stones from the synthetic ones. Because of the fluids used in the synthesis of most gems in the laboratory usually are quite unlike those present in nature (Roedder, 1982). The inclusions manifest the identifying characteristics of the pegmatitic growth process. Aquamarine is often traversed by fine growth tubes parallel to c-axis in concurrence with the structural peculiarities of beryl having hollow channels between silicate rings (Gübelin, 1953). These inclusions known as "rain" are used as a positive identification of aquamarine by gemmologists. According to Gübelin, 1953, the beryl structure causes the development of growth tubes either hollow or filled with foreign substances. "



Thank you very much for your erudite explanation, Kevin.

Don

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PostPosted: Apr 22, 2019 02:17    Post subject: Re: Don Lum Collection  

Yes, thanks Kevin!
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PostPosted: Apr 24, 2019 20:36    Post subject: Re: Don Lum Collection  

In Memory of Heimo Hellwig


P4241890 (2).JPG
 Mineral: Azurite, Cerussite
 Locality:
Tsumeb Mine, Easter Pocket, Tsumeb, Otjikoto Region, Namibia
 Dimensions: 35 mm x 22 mm x 22 mm
 Description:
ex Georg Gebhard
Lustrous dark blue twinned Azurite with Cerussite.
 Viewed:  903 Time(s)

P4241890 (2).JPG



P4241891 (2).JPG
 Mineral: Azurite, Cerussite
 Locality:
Tsumeb Mine, Easter Pocket, Tsumeb, Otjikoto Region, Namibia
 Dimensions: 35 mm x 22 mm x 22 mm
 Description:
ex Georg Gebhard
Broad flat blade of Azurite.
 Viewed:  902 Time(s)

P4241891 (2).JPG



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Don Lum




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PostPosted: Apr 25, 2019 15:22    Post subject: Re: Don Lum Collection  

Quartz with phantoms


P4241910 (2).JPG
 Mineral: Quartz (variety amethyst, variety smoky quartz)
 Locality:
Goboboseb Mountains, Brandberg area, Erongo Region, Namibia
 Dimensions: 92 mm x 37 mm
 Description:
Quartz crystal with phantoms
 Viewed:  833 Time(s)

P4241910 (2).JPG



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jose luis jara jara




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PostPosted: Apr 25, 2019 15:27    Post subject: Re: Don Lum Collection  

I like the ghost of amethyst in quartz
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Don Lum




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PostPosted: Apr 25, 2019 15:38    Post subject: Re: Don Lum Collection  

jose luis jara jara wrote:
I like the ghost of amethyst in quartz


Thank you for pointing him/her out, Jose.

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PostPosted: Apr 30, 2019 20:02    Post subject: Re: Don Lum Collection  

Elmwood


IMG_7934 (2).JPG
 Mineral: Calcite, Barite, Micro Fluorite
 Locality:
Elmwood Mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith County, Tennessee, USA
 Dimensions: 195 mm x 190 mm x 130 mm
 Description:
 Viewed:  707 Time(s)

IMG_7934 (2).JPG



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Don Lum




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PostPosted: May 01, 2019 12:24    Post subject: Re: Don Lum Collection  

Nigeria


IMG_7932 (2).JPG
 Mineral: Schorl (Tourmaline Group), Muscovite
 Locality:
Ofiki, Oyo State, Nigeria
 Dimensions: 29 cm x 25 cm x 22.5 cm
 Description:
 Viewed:  667 Time(s)

IMG_7932 (2).JPG



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PostPosted: May 01, 2019 22:28    Post subject: Re: Don Lum Collection  

Oppu Mine


P5011918 (2).JPG
 Mineral: Rhodochrosite after Calcite
 Locality:
Oppu Mine, Nishimeya-mura, Naka-Tsugaru-gun, Aomori Prefecture, Tohoku Region, Honshu Island, Japan
 Dimensions: 12 cm x 6.1 cm x 3.4 cm
 Description:
 Viewed:  611 Time(s)

P5011918 (2).JPG



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PostPosted: May 02, 2019 02:04    Post subject: Re: Don Lum Collection  

After seeing the recent specimens, I think this topic should be re-named, instead of Don Lum Collection it should be DON LUM MINERAL MUSEUM!

I'm in awe, Don, they're getting better and better! :-)
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Don Lum




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PostPosted: May 02, 2019 11:54    Post subject: Re: Don Lum Collection  

Tobi wrote:
After seeing the recent specimens, I think this topic should be re-named, instead of Don Lum Collection it should be DON LUM MINERAL MUSEUM!

I'm in awe, Don, they're getting better and better! :-)



Tobi, I am humbled by your comment and glad you are enjoying the collection. I appreciate your taking the time to write.

Sincerely,

Don

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Kevin Conroy




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PostPosted: May 02, 2019 13:50    Post subject: Re: Don Lum Collection  

Don, awesome pseudomorph!
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Don Lum




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PostPosted: May 02, 2019 15:04    Post subject: Re: Don Lum Collection  

Kevin Conroy wrote:
Don, awesome pseudomorph!


Thank you, Kevin. I appreciate your comment.

Regards,

Don

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PostPosted: May 02, 2019 15:40    Post subject: Re: Don Lum Collection  

Rhodochrosite

The label reads Rhodochrosite after Baryte, Oppu Mine. I think that this is Rhodochrosite after perhaps Tetrahedrite or Chalcopyrite or Sphalerite.

I would appreciate any opinion about what the mineral was that was replaced by the Rhodochrosite in this specimen.

Thank you.



P5011921 (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:
 Viewed:  513 Time(s)

P5011921 (2).JPG



P5011926 (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:
 Viewed:  515 Time(s)

P5011926 (2).JPG



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PostPosted: May 07, 2019 12:59    Post subject: Re: Don Lum Collection  

Don Lum wrote:
Rhodochrosite Pseudomorph
The label reads Rhodochrosite after Baryte, Oppu Mine. I think that this is Rhodochrosite after perhaps Tetrahedrite or Chalcopyrite or Sphalerite.
I would appreciate any opinion about what the mineral was that was replaced by the Rhodochrosite in this specimen.
Thank you.
An interesting specimen Don, but I have no idea on this. The only pseudomorphs of rhodochrosite that I know from Oppu Mine are after calcite. Maybe this is a strange kind of it but it does not look like it once was calcite ... or barite ...

I hope that one of us can solve this riddle!
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PostPosted: May 07, 2019 13:46    Post subject: Re: Don Lum Collection  

Thank you, Tobi.
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Bob Morgan




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PostPosted: May 07, 2019 16:23    Post subject: Re: Don Lum Collection  

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.
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