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Glass Identification - Post here for all ID requests => Glass => Topic started by: barandi on June 17, 2011, 03:33:04 PM

Title: Help to identify geode bowl. Murano?
Post by: barandi on June 17, 2011, 03:33:04 PM

Nice bowl, 12 x 9 cm, 4 cm height, no label. Murano? 1960's?
Many thanks

Title: Re: Help to identify geode bowl. Murano?
Post by: Greg. on June 17, 2011, 03:37:57 PM

Looks like Murano geode bowl, prob around the 60s, although I wouldn't be surprised if they were still being produced!

Title: Re: Help to identify geode bowl. Murano?
Post by: barandi on June 17, 2011, 03:46:32 PM

Probably, but I'm sure this is not new, it had a lot of dirt and some wear and tear...
Thank you

Title: Re: Help to identify geode bowl. Murano?
Post by: kane_u_pain on June 18, 2011, 02:19:45 AM

Definitely murano...why do people call this a geode bowl? Shouldn't they be round?

No idea as to maker as I have never seen/owned one with a label...

Title: Re: Help to identify geode bowl. Murano?
Post by: barandi on June 18, 2011, 03:53:08 PM

Thanks, I thought geode was when the rim is flat, any shape: round, oval...

Title: Re: Help to identify geode bowl. Murano?
Post by: Lustrousstone on June 18, 2011, 06:33:41 PM

http://en.wikipedia.org/wiki/Geode

Title: Re: Help to identify geode bowl. Murano?
Post by: kane_u_pain on June 18, 2011, 11:24:22 PM

So it is okay to call this shape a geode? I always thought they had to be round

Or have I had this conversation here before and completely forgotten  :ho: it wouldn't surprise me...

Title: Re: Help to identify geode bowl. Murano?
Post by: ahremck on June 19, 2011, 01:00:27 AM

If you read the Wikipedia reference supplied by Christine you will see that Geodes are formed in cavities in the rock. 

Naturally we can not expect the cavity to be round.  In fact the process of filling or part filling the cavity would be a very long time-frame.  So what tends to happen is that the crystallizing material contains impurities that change the crystal colour.  This is most spectacular in good agate - especially Australian agate from Agate Creek.  If the cavity is vaguely spherical and the colour combinations are such that the bands come in three or four layers only slicing it in half produces an extremely close approximation of Geode glass.  It is important to realise that the layers are usually of very even thickness - except for the centre of a filled cavity.  See an example off Google images.

There is no reason that Geode glass needs to be round - but given the complexities of trying to keep three or four layers of different coloured glass organised so the layer thickness remains more or less constant must constrain the number of shapes it makes sense to attempt.

Hope this clarifies things, Kane

Ross

Title: Re: Help to identify geode bowl. Murano?
Post by: TxSilver on June 19, 2011, 01:29:04 AM

Christine, the last geode at the Wikipedia link you gave looks like this bowl's shape. Perfect. I think the main requirement for a geode glass bowl is the top be flat like it was cut with a lapidary saw, then polished. Barnadi's bowl looks like it fits this, so I wouldn't have any problem calling it a geode.