One of the mysteries of the English language finally explained.
- ‘The outer zone of the alteration halo is most extensively developed in the semi-pelitic schists, and is manifested by the pseudomorphous replacement of biotite by chlorite, rutile and quartz, and feldspar by sericite.’
- ‘Whenever this layer is found, collectors know to look carefully below it for highly silicified wood and nodules (either as agate fortifications or pseudomorphous replacement of barite concretions).’
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