Mineral Parameters

Florida Soil Characterization Data Base abbreviations for the most common soil minerals found in Florida soil clay fractions (<0.002 mm) are as follows:

KA_MIN: Kaolinite; 1:1 non-expansible secondary phyllosilicate.
HIV_MIN: Hydroxyinterlayered vermiculite; partially-expansible secondary phyllosilicate
SM_MIN: Smectite; 2:1 expansible secondary phyllosilicate.
QZ_MIN: Quartz; SiO2; primary tectosilicate.
GI_MIN: Gibbsite; Aluminum hydroxide.

Abbreviations for minerals found less commonly in Florida soils clay fractions are:

FL_MIN: Feldspar; primary tectosilicate with cations (mostly K in Florida) in structure.
VM_MIN: Vermiculite; 2:1 expansible secondary phyllosilicate;
CL_MIN: Calcite; calcium carbonate.
DL_MIN: Dolomite; Calcium magnesium carbonate.
CH_MIN: Chlorite; non-expansible phyllosilicate.
SE_MIN: Sepiolite; Magnesium silicate.

Mineralogy was determined only for selected horizons within a soil, and only for the clay (<0.002-mm) fraction. The data are based on x-ray-diffraction analysis, and should be viewed as semi-quantitative. They can show relative depth- or geographic trends when expressed as ratios or indices; absolute percentages should be interpreted with caution. Iron oxide minerals, present in small amounts in most soils, were removed by pretreatment to enable effective dispersion of clay. Also, some common minerals tend to occur in amounts too small to be detected by x-ray diffraction.