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@ deighaingeal

The BBWs are not used for building, they are too soft. It is the rocks between the veins that are used for building. The veins are not more that 10% of the rock and of that 10% only...

The backing of most coticules is a piece of slate glued to the coticule to reinforce it. The Belgian blue side of the coticule often gets detached from the coticule due to the controlled explosions...