The prominence of clay minerals in the hydrothermally altered rocks of many mineral deposits has been emphasized in recent years. The presence of clay minerals of hydrothermal origin has long been recognized but for obscure reasons not much importance had been attributed to them. It has now been shown that most of the minerals belonging to the clay groups (kaolin, montmorillonite and hydromica groups) occur abundantly in many hydrothermally altered rocks. In general the clay minerals form during the early stage, or advancing front of the alteration and are commonly converted to sericite as the process continues.The detailed paragenesis of clay minerals in hydrothermally altered rocks is imperfectly known and needs much work for its clarification.

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