Weathering - exploreiowageology.org€¦ · weathering-resistant Fe and Al oxides. 0 02 g 02 molecules and cations Exchangeable water molecules and cations Illite and smectite have

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Web adventure: Frost at work

Frost shattered

rocks

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gypsum

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pyroxene hematite quartz

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dissolution

calcite bicarbonate

Strat and Sed, Ch. 1 23

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• Orthoclase (K) feldspar • Plagioclase (Na) feldspar

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Mafic minerals Felsic mineralsolivine

Ca plagioclasepyroxene

Ca-Na plagioclaseamphibole Na-Ca plagioclase

Na plagioclasebiotite

orthoclase, muscovite, quartzincr

easi

ng st

abili

ty

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