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Ice vase - Feb 2002
Ice vase - Jan 2004
Ice tower - Mar 2004
Ice pegs - 2007-8
Ice spike - Jan 2008
Ice spike - Dec 2008
Ice spikes - Dec 2008
Ice spikes - Feb 2009
Ice needle - Feb 2009
Ice triangles
Ice hair - Jan 2005
Brian Maginn's ice spike
Jon Nelson's ice vase
Stefan's 150mm ice spike

For more information see:

SnowCrystals.com
and
Ice spikes

also

Scientific American
Create ice spikes
Icicles in reverse

Brian Maginn's ice spike, 3rd January 2009

I don't usually use other people's pictures, but Brian sent me these and I thought they were so amazing that I asked him if I could use them. He has kindly given his permission.
He found this ice spike in his garden in Leicestershire, England, on 3rd January 2009. It is a giant, measuring 115mm in height. That's more than twice the height of my largest spike!

enormous ice spike

enormous ice spike

The picture below gives a better idea of its size:

view of enormous ice spike in bird bath

Many thanks, Brian!