Fritz Millhaupt's tip on using a mortar and pestle to reduce scenery material to a smaller size is great, but for those of you who have forgotten chemistry lab, it may be useful to point out that you hold the pestle in your fist, thumb pointing up, and grind stuff making a circular motion with your arm. The curves on the pestle and the mortar are designed so this works most efficiently.
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Mortar and Pestle
Fritz Millhaupt's tip on using a mortar and pestle to reduce scenery material to a smaller size is great, but for those of you who have forgotten chemistry lab, it may be useful to point out that you hold the pestle in your fist, thumb pointing up, and grind stuff making a circular motion with your arm. The curves on the pestle and the mortar are designed so this works most efficiently.