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igneous rocks are variable in composition .. and so the minerals produced by their weathering .. serecite (formed by the weathering of plagioclase), idingsite (weathering of olivine), zeolites, Kaoline ( weathering of orthoclase), epidot, chlorite ..

2007-02-09 09:37:09 · answer #1 · answered by Geo06 5 · 2 0

This question is overly generic. There are many weathering processes and weathering agents that can act upon igneous rocks.

Igneous rocks have mica, feldspar and quartz. I think what you're looking for is gypsum or clay.

2007-02-09 08:56:25 · answer #2 · answered by vintageprincess72 4 · 0 0

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