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It's not very big actually, 32mm on an edge I think ( I'll check ).
Here's a pic of the beast. If you look carefully at the top surface you can just see the diag join lines. It's certainly an interesting piece of glass and throws all sorts of colours and effects if you twist it through various angles. It needs to be in a dark place to stop view through the block interfering with the incoming light from the front face ( Left facing in the pic ).
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