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Schist and slate are closely related. They're both metamorphic rocks, only to a different degree. Schist often encompasses larger crystal structures, such as garnet. Slate does not.
For those...

It's true that Maurice Celis manages to keep his business profitable by selling almost everything else he quarries in order to get to the coticule. Slate is not among it. They produce natural...

SPR member Joelski was so kind to give me a copy of a little booklet, written in French by one Charles Gaspard, about the coticule history. Joelski and I have been planning a translation thread for...