Rock 365 : Day 46 : Boulby Potash #365photos

Day 46 : This week I’ll concentrate on samples from the Cleveland Potash mine at Boulby, North Yorkshire.  This is the Boulby Potash. It comes in two forms, a clean ore and a shaly ore, the ‘ore’ in question being sylvinite (a mixture of sylvite KCl and halite NaCl).  Close to a major fault the sylvinite becomes strained and this can be seen in the mineral lineations on the crystals.