Multimedia Gallery - Neoformed clay coating

From the Soil Micromorphology Slide Collection

Micromorphological description of slide: Basaltic fragment covered with an isotropic, nonlaminated clay coating (interpreted to be neoformed and noncrystalline)

Data for the horizon
Physical and chemical data available: See references.
Macromorphological description of horizon: See references. Micromorphological description of horizon: See references.

Data for thin section
Preparation of sample: acetone dry Impregnating medium: polyester resin
Thickness of section: 30 µm

Soil Classification
U.S.: Albaqualf

Elevation: 350-375 m
Physiographic position: Quaternary terrace in valley of the Allier River
Topography: Flat
Parent material: Mafic volcanic and granitic deposits Soil climatic data and/or soil water balance: Poorly drained

Data for 35-mm slide
Frame length: 2.8 mm
Light mode: Plane polarized (CT23); cross polarized (CT 24)

Feijtel, T.C., A. Jongmans, N. van Breemen, and R. Miedema. 1988. Genesis of two Planosols in the Massif Central, France. Geoderma 43:249-269.
Feijtet, T.C., A. Jongmans, and J.D.J. van Doesburg. 1989. Identification of clay coatings in an older Quaternary terrace of the Allier, Limagne, France. Soil Sci. Soc. Am. J. 53:876-882.
Source – A. Jongmans

Slides CT23 and CT24. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.