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P.4<br />

TABLE P.1.2. Weathering Sequence <strong>of</strong> CJay-Size Minerals in Soils<br />

and Sedimentary Deposits-al<br />

Weathering Stage Clay-Size Mineral Occurring at Various Stages<br />

and Symbol <strong>of</strong> the Weathering Sequence<br />

1, Gp Gypsum (also halite, etc.)<br />

2, Ct Calcite (also dolomite, aragonite, etc.)<br />

3, Hr Olivine-hornblende (also diopside, etc.)<br />

4, Bt Biotite (also glauconite, chlorite, antigorite, etc.)<br />

5, Ab Albite (also anorthite, microcline, stilbite, etc.)<br />

6, Qtz Quartz (also cristobalite, etc.)<br />

7, Il Illite (also muscovite, sericite, etc.)<br />

8, X Hydrous Mica - Intermediates<br />

9, Mt Montmorillonite (also beidellite, etc.)<br />

10, KI Kaolinite (also halloysite, etc.)<br />

11, Gb Gibbsite (also boehmite, etc.)<br />

12, Hm Hematite (also goethite, limonite, etc.)<br />

13, An Anatase (also rutile, ilmenite, corundum, etc.)<br />

(a) After Jackson et al. (1948).<br />

TABLE P.1.3. Persistence Order <strong>of</strong> Minerals(a'b)<br />

-3. Anatase 11. Epidote<br />

-2. MUSCOVITE 12. HORNBLENDE<br />

-1. Rutile 13. Andalusite<br />

1. Zircon 14. Topaz<br />

2. Tourmaline 15. Sphene<br />

3. Monazite 16. Zoisite<br />

4. Garnet 17. AUGITE<br />

5. BIOTITE 18. Sillimanite<br />

6. Apatite 19. Hypersthene<br />

7. Ilmenite 20. Diopside<br />

8. Magnetite 21. Actinolite<br />

9. Staurolite 22. OLIVINE<br />

10. Kyanite<br />

(a) After Pettijohn (1941).<br />

(b) Capitals signify common minerals<br />

listed in the Goldrich sequence.<br />

mineral in a weathering solution depend on many environmental factors such as pH, Eh, com-<br />

plexing agents, temperature, fixation/adsorption, ion exchange and ionic strength. These<br />

factors are explained briefly below.

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