Since a large particle size can easily cause division deviation, material over 10mm is not suitable for coning and quartering method.In this instance a riffle divider should be used.

• 由于大颗粒样品堆成圆锥时容易产生偏析，造成缩分偏差，样品粒度大于10mm不宜使用圆锥四分法，最好使用二分器。