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Olivine from Marburg, Germany
  
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Tobi
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PostPosted: Apr 26, 2009 05:41    Post subject: Olivine from Marburg, Germany  

I mentioned before that i was collecting olivine for many years near my hometown. There was one really exceptional find that i want to share with you. When i showed it to fellow collectors in Germany they were stunned and they assured me that a olivine crystal of that size is very unsual for Europe. These olivines are grown in the basalt on a former military training area a few kilometers away from Marburg (Northwestern Hesse). One day, it is three years ago, i picked up a piece of basalt and turned it around ... that's what my eyes saw after the cleaning. The crystal has a lenght of 20 mm and is completely transparent.


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PostPosted: Apr 27, 2009 13:58    Post subject: Re: Olivine from Marburg, Germany  

Very nice crystal and in nice contrasting matrix too!
There are some wonderful olivine which were found primarily in the 1950-60s in Norway (Almklovdalen) but large crystals are rare. I have a gemmy 4 cm crystal, of which some 2.5 cm is flawless and could cut a large stone. Of course I keep it as a specimen! But unlike yours, it has no matrix. Thanks for showing it Tobias!
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PostPosted: Apr 28, 2009 10:42    Post subject: Re: Olivine from Marburg, Germany  

A 4 cm gem crystal of olivine? Wow, please show it!

These olivines from the basalt near Marburg are usually not that big and gemmy. I was collecting them for 5 years or so, and i always found just the ordinary clusters of crystals, the biggest of them about 4 mm. One day i found my second-best one, a single crystal of 18 x 11 x 7 mm, but it was broken and weathered. Yes, and then there was this one ... i couldn't believe my eyes when i held it in my hands.
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Peter




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PostPosted: Apr 28, 2009 14:32    Post subject: Re: Olivine from Marburg, Germany  

Guten abend

I do not have this specimen where I am now. Will try to remember to make a snapshot and post for you!
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Andreas Gerstenberg




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PostPosted: Mar 05, 2010 06:45    Post subject: Re: Olivine from Marburg, Germany  

I kinda know this sweety. Oh, I really think I do...
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Tobi
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PostPosted: Mar 05, 2010 12:49    Post subject: Re: Olivine from Marburg, Germany  

You do. It's the one we already discussed on mineralienatlas.de some time ago ...
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Jason




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PostPosted: Mar 05, 2010 12:56    Post subject: Re: Olivine from Marburg, Germany  

That is sweet..color looks fantastic..well done Tobias..do you have a pic of a regular or standard find from that location
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PostPosted: Mar 05, 2010 13:25    Post subject: Re: Olivine from Marburg, Germany  

My last answer was so dumb, sorry: I forgot that this specimen was the one i sold to Andreas and which is now in his collection :D

Amethystguy, i will try to take photos of some average specimen from there tomorrow.
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Tobi
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PostPosted: Mar 06, 2010 07:06    Post subject: Re: Olivine from Marburg, Germany  

amethystguy wrote:
That is sweet..color looks fantastic..well done Tobias..do you have a pic of a regular or standard find from that location?

Here's a sample of a common piece of rock from that locality (4 cm specimen). Really boring tiny crystals of olivine in basalt, like you can find them on thousands of localities all around the world. 99,9 percent of them from Marburg look like that and are absolutely unspectacular ...



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PostPosted: Mar 06, 2010 07:22    Post subject: Re: Olivine from Marburg, Germany  

... but the other 0,1 percent are really good (for central-European olivine).

I made two real good finds: The one with which i started the thread and which now is in Andreas Gerstenberg's collection, and this one here. It measures 50 x 30 x 18 mm at all and the "large" crystal measures nearly 1 cm.

And this is but a fragment of a former, larger single crystal that - according to the visual cavity in the basalt and to the measures of its fragments - must have had a size of 18 x 12 x 9 mm. Brilliant for a European olivine, but broken and weathered long time ago.



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Jason




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PostPosted: Mar 06, 2010 09:23    Post subject: Re: Olivine from Marburg, Germany  

LOL..compared to the norm, the good ones you found are like night and day..well done Tobias!!!!
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Antonio Alcaide
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PostPosted: Mar 06, 2010 09:59    Post subject: Re: Olivine from Marburg, Germany  

Universal law of crystals and finds: "If a find provides thousands of small crystals one can find one or two big ones at least". It's a matter of chance -and effort-. Tobias' olivines are the proof.

Cheers

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PostPosted: Mar 07, 2010 03:37    Post subject: Re: Olivine from Marburg, Germany  

That's right, Antonio. I don't know how many field trips i went on to look for olivines, but i think i was there maybe a dozen times or so and i only found these two large crystals. And if you say that it needs a thousand disappointments to succeed once: I think turned around and picked up about at least 2000 rocks to find that two good ones, so your calculation was right ;-)
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