secondary mineral

Show Summary Details

Quick Reference

A mineral formed by the subsolidus alteration of a pre-existing primary mineral in an igneous rock. Minerals which have crystallized from a magma are stable only at high temperature and can readily alter to low-temperature, secondary minerals when a fluid, e.g. water, is introduced into the rock system. The fluid acts as a catalyst to initiate the alteration reaction. Most secondary minerals are hydrated silicates. A typical example is the alteration of primary olivine to secondary chlorite and serpentine.

Subjects: Earth Sciences and Geography.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.