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claytonender · 25-03-2007, 23:06

In the Natural History Museum in London, in the room that has all sorts ofrocks etc in , there is a Nori brick - with a plaque saying that this is a definition of hardness

25-03-2007, 23:06	#15
claytonender Senior Member Join Date: Nov 2004 Location: Clayton-le-Moors Posts: 892 Liked: 0 times Rep Power: 270	Re: Accy Nori In the Natural History Museum in London, in the room that has all sorts ofrocks etc in , there is a Nori brick - with a plaque saying that this is a definition of hardness