REPLY

Janke has corroborated the results of Wellendorf & Krinsley (1980) which indicated that small quartz particles are platy in nature. This is not the first time that fine, platy quartz has been described in the literature; Krinsley & Smalley (1973) believed that quartz particles became increasingly flatter with decreasing size and that a cleavage mechanism could operate below about 100μm. If Janke's work were extended to smaller sizes, perhaps this idea of increasing flatness with decreasing size would be confirmed or denied.