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Mica Genesis in Hawaiian Soils¹

ABSTRACT

A soil mica having a formula Na_0.11 NH4_0.06 K_1–24 (Al, Si) (Al, Fe, Mg) O₂₀ (OH)₄ has been identified in soils of the wet uplands in the Hawaiian Islands. It contains 7.2% potash and is predominantly a mixer-layered mica with vermiculite-montmorillonite and chlorite. The mica is concentrated in the surface horizons, and its concentration increases with soils formed under increasing rainfall and elevation. Biological recycling of potash is proposed as a mechanism for its formation.

¹ Published with the approval of the Director of the Hawaii Agr. Exp. Sta. as Technical Paper no. 880 and of the Hawaii Inst. of Geophysics as Contribution No. 214. Data taken from a thesis submitted by the senior author in partial fulfillment of the requirements for an M.S. degree.

² Former East-West Center grantee and graduate student, and Associate Soil Scientist, respectively.

Received for publication May 26, 1967. Accepted for publication September 7, 1967.