If a soil particle passes through the #200 sieve, it is most likely what type of soil?

When a soil particle passes through the #200 sieve, it indicates that the soil has a very fine particle size, typically less than 0.075 mm (75 microns). This size classification is associated with silt and clay.

Clay/silt, which aligns with the information provided, includes particles that are small enough to pass through this sieve size, leading to their identification as fine-grained soils. These soils exhibit unique physical properties such as plasticity and cohesion, especially in the case of clay.

In contrast, sandy soil contains larger particles that do not pass through the #200 sieve, making it a distinct classification. Gravel consists of even larger particle sizes, and while silty clay also involves fine particles, the direct reference to passing through the #200 sieve most clearly points to the classification as clay/silt, where the defining characteristic is the fine particle size that influences the soil's behavior and engineering properties.