Calcium Oxalate Phytoliths

This image shows a number of calcium oxalate monohydrate (whewellite) phytoliths from maple (Acer macrophyllum) leaves. This image shows a representative sampling of the prismatic and twinned forms common to maple leaf phytoliths. Angles around 140, 70, 110, and 127 are common, depending on the form and orientation of the crystal.