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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.

Regards,

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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