Green coffee beans are, in contrast to roasted coffee beans, very hard and contain some rest of moisture. It is therefore not easy to grind them.

Most mills used for grinding roasted coffee beans are not suitable for grinding raw coffee beans. Most hand-mills with a stone or ceramic grinder (burr grinders) and grinders in automatic coffee machines (e.g. disc mill) can be damaged already at the first grinding attempt. So we strongly advise you not to try it!