A question for 'szgabor': 'Where was this?'

It looks like some mineral crystal and its inside is lit with blue light.
My first guess is a salt-crystal lamp, but I think it would be too simple and easy.

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Regards,
Gábor
My website
My PPG site

Is that crystal?,,,,,Or could it be , perhaps,,, Ice??
Though it does look dry to be ice

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Best Regards, Larry.

All the gear & no idea.

A geode?

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Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
Flickr • Fluidr • PPG • Street • Portfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!

Yes, you all correct, it is the build up of lime-scale within the copper outlet pipe/tube at the top of my hot water cylinder. The outlet tube was originally 19 mm inside diameter (I/D) approx. The resultant escape hole measured approximately 8mm x 6mm after some 27 years of domestic use. Thus a cross sectional area reduction of 83%, approximately! I supported the tube on a scrap of extrusion, placed a blue card behind the subject and illuminated the card with a hand held torch in an attempt to give a blue water affect. 35mm macro lens with 31mm of extension tube, I set the exposure to bulb and guessed at 17 seconds, using the old contact printing method of counting 1 'O', 2 'O', etc., in my head. See my later uploaded oblique view image of a short length of the tube.
Regards Photon

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All five minute jobs take a minimum of eight hours!

The combination of the blue and white colors is really nice. I like shape and texture of crystals, nice shot Colin.

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Regards,
Gábor
My website
My PPG site