talc

This term refers to both the raw geological mineral and the processed powder derived from it. In a scientific context, it is characterized by its extreme softness, serving as the baseline for the Mohs scale of mineral hardness. The tactile quality is often described as soapy or greasy, which distinguishes it from other white minerals.

As a powder, it is associated with hygiene and dermatological care, specifically for moisture absorption. Because it is an uncountable mass noun, it cannot be pluralized to describe multiple quantities of the powder; instead, speakers must use partitive phrases such as a container of talc or a dusting of talc to specify amount.