1. Sand, silt, and clay; coarse fragments.
• Sand = 2.0-0.05 mm diameter particles
• Silt = 0.05-0.002 mm diameter
• Clay = <0.002 mm diameter
• Coarse fragments = > 2 mm diameter
2. Understand and use the textural triangle.

The textural triangle helps determine the soil textural classification of a soil based on its fine-earth fraction (particles <2mm, that is sand, silt and clay). On the bottom, find the percent sand, on the left hand, percent clay, and on the right hand, percent silt. As an example, a soil has 15% sand, 60% silt, and 25% clay – this soil would be classified as a silt loam (Figure from Soil Survey).

image source: http://nmsp.cals.cornell.edu/publications/factsheets/factsheet29.pdf