One of our projects is repairing a harbour.  A recent visit has been to see the yard and quarry producing stone for protecting its foundations.  Here is Gavin Tennant at the Clashach quarry on the Moray coast with one his blocks.  The rock is obtained by drilling holes and using a low explosive that is very gentle, resulting in blocks up to 90 tons!  Although it’s a sandstone, being non-calcareous the stone is highly durable.  The colour is generally of sand dunes, but pinks and streaks can be obtained from beds near a geological fault at one end of the quarry.