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Scanning Electron Microscopy of Opaque Opaline Forms Isolated from Forest Soils in Ohio¹

ABSTRACT

Opaque opal bodies isolated from surface horizons (A1) of three Miamian soils were examined with correlative light optical and scanning electron microscope techniques. Opaque bodies comprise from 15 to 70% of the opal isolated from these horizons and range in morphology from spheres to nondescript equidimensional, rod, or elongated forms. Under transmitted light only the gross morphological outline can be deduced. However, with the scanning electron microscope a strong similarity exists between many of the opaque bodies and spheres, cups, mosaic aggregates, and bladed opaline forms isolated from reference deciduous tree leaves. Some of the opaque forms provide positive differentiation of grass vs. forest origin of the opal.

¹ Contribution from the Dep. of Agronomy, Ohio Agr. Res. and Dev. Center, State Project 371, Journal Paper no. 91-72. Presented before Div. S-9 and S-5 Soil Science Society of America, Miami, Florida, Nov. 2, 1972.

² Professor and Instructor of Agronomy, respectively, Ohio Agr. Res. and Dev. Center, Wooster and Ohio State Univ., Columbus 43210.

Received for publication September 15, 1972. Accepted for publication March 7, 1973.