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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 18:53 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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I LIKED my visit, had a good time, had a full day with a curator and we brought FLASHLIGHTS.
_________________ Minerals you say? Why yes, I'll take a dozen or so... |
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 18:57 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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...Now, where was I? Oh yes.....
HART - Recently 're-discovered' in the Geological Survey collections this specimen came by exchange from Peter Bancroft. Some careful cleaning and conservation reveals our best rose-quartz - Minas Gerais, Brazil
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How's this for a rose quartz? |
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_________________ Minerals you say? Why yes, I'll take a dozen or so... |
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 19:06 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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So, I have never been called a celebrity guest before, have you Jolyon? Kind of funny isn't it? ( chuckling here <------ )
Speaking of celebrities..here's my very own Jim with that Quartz.
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 19:07 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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...Calcite
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_________________ Minerals you say? Why yes, I'll take a dozen or so... |
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 19:11 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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Witherite from Cumbria. This is superb! |
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_________________ Minerals you say? Why yes, I'll take a dozen or so... |
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 19:14 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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...Chlinoclase.
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 19:19 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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Great anatase from Binn, Valais, Switzerland 1896. In Bancroft's book the crystal is 3.7 x 3.2 cm.
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 19:24 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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HART - The famed stephanite from Wheal Newton, Cornwall. For the species a 'killer' specimen, let alone the fact it is Cornish. A wonderful paper by Prof. J.W. Lewis (Camb. Phil. Soc. Proc., Vol. IV, Part IV, 240-252) describes the form and crystallography.
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 06, 2011 19:32 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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HART - The acanthite is an amazing specimen. From Wheal Newton Cornwall, mid 19th century. By far the best one in the collection although Russell has smaller and similar. This specimen came from a Mr Bennett who was agent for the mine - he also supplied the stephanite crystal above
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Tobi

Joined: 07 Apr 2009
Posts: 3495
Location: Good Old Germany



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John S. White
Site Admin

Joined: 04 Sep 2006
Posts: 1263
Location: Stewartstown, Pennsylvania, USA



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Posted: Oct 07, 2011 05:27 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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Are not the more recent tourmalines Alan Hart is referring to that are similar to the one shown in Gail's photos that is illustrated in Sowerby from Burma and not Viet Nam?
Hi John, the Burmese material I am familiar with tends towards a richer rubellite colour, this is the specimen I saw that me me think 'wow a mini Symes rubellite', very similar in colour and form. Unless of course the locality is 'wrong'.
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Tourmaline Luc Yen, Vietnam approx 12 x 12 cm |
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_________________ John S. White
aka Rondinaire |
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 07, 2011 07:01 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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The huge old tourmaline was from Siam , ( AVA) (now Burma and Thailand)
_________________ Minerals you say? Why yes, I'll take a dozen or so... |
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 07, 2011 07:04 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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Tobias, you are SO on spot! To be, or not to be, that is the question?
_________________ Minerals you say? Why yes, I'll take a dozen or so... |
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John S. White
Site Admin

Joined: 04 Sep 2006
Posts: 1263
Location: Stewartstown, Pennsylvania, USA



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Posted: Oct 07, 2011 07:58 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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I understand that, but I was referring to the new material that is similar in appearance that Alan Hart said was from Viet Nam. I feel quite certain that it is also from Burma, very likely the same general area as the antique piece in the photos.
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 07, 2011 08:19 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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and let's continue...
Matlockite from the Ludlam collection. From old workings in the lead mines around Cromford, Derybshire. Thick tabular crystals for the species, which also occur in thinner masses or radiating spherulitic aggregates with galena etc
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 07, 2011 08:20 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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61 and 62 above is Chlinoclase.
_________________ Minerals you say? Why yes, I'll take a dozen or so... |
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Alan.Hart

Joined: 05 Jan 2009
Posts: 15
Location: London


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Posted: Oct 07, 2011 08:25 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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Hi John, yes the Burma material seems to tend a lot more toward rubellite colour, the specimen I saw which was distinctly similar was being sold by Wayne Leicht - I have an image somewhere and will try and upload it. It could be however that my memory is playing tricks on me - be interesting to see......
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 07, 2011 09:47 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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Gail

Joined: 21 Feb 2008
Posts: 5789
Location: Texas, Lone Star State.



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Posted: Oct 07, 2011 09:50 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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Jesse Fisher

Joined: 18 Mar 2009
Posts: 581
Location: San Francisco



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Posted: Oct 07, 2011 09:57 Post subject: Re: A trip to London and the museum. Sept 2011. Gail and Jim Spann |
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The habit of the "Sowerby" tourmaline is very much like some of the recent material from Yen Bai, about 100 km NE of Hanoi, in Vietnam. The tourmaline from these pegmatites is polychrome, and I have seen colors ranging from pale pink to deep to green. I have a fairly large one that is roughly similar to the NHM one except that the a pink interior has been covered with a thin surface layer of dark green.
I also have a tourmaline, reportedly from the Momeik area, near Mogok, which is a pale yellow-pink color and has a brush-like habit with multiple terminations. The overall appearance of the Vietnamese tourmalines is much closer, however.
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