I have a lighting commission that was going to use glass shades, client has just asked me to investigate mica which I have not used before. 

I need to shape the shade into a either half cones or shallow troughs that would be closed at both ends and I have seen mica curved for lighting but have googled forming & bending mica sheets but can't find any info ....  any pointers very gratefully received!  Can you form it with heat or hot water, will it drape over a form?