Abstract
Abstract The clay mineralogy of four soil profiles derived from epidiorite, serpentinised peridotite, and serpentinite has been investigated by X-ray diffraction and electron optical procedures. The sand mineralogy of each soil, and the minerals in the fresh rocks, were determined by X-ray diffraction and optical methods. A weathering sequence was established in which ferromagnesian minerals, especially chrysotile and lizardite, have altered to vermiculite. In three profiles the vermiculite contained much interlayer material, and altered to chlorite, whereas in the fourth profile this mineral contained little interlayer material, and did not alter to chlorite. Lizardite may have an unusual tubular form.
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