2505.10 - Silica sands and quartz sands:

This HTS category, 2505.10, specifically covers silica sands and quartz sands. These are natural sands where silica (silicon dioxide) is the predominant mineral component. They are generally recognized for their high purity and specific granular characteristics, making them suitable for various industrial applications.

At this level, the category distinguishes itself from its sibling category, 2505.90, which is designated for "Other" natural sands. While 2505.10 focuses exclusively on silica and quartz sands, the "Other" category encompasses all other types of natural sands not otherwise specified, such as construction sand or decorative sand, which may have different mineral compositions or intended uses.

Within 2505.10, two subcategories further refine the classification based on chemical composition and purity. Subcategory 2505.10.10.00 addresses highly pure silica sand, defined by a minimum silica content of 95% by weight and a limited iron oxide content of 0.6% or less. This high purity is crucial for applications like glass manufacturing. The other subcategory, 2505.10.50.00, covers all other silica sands and quartz sands that do not meet the strict specifications of 2505.10.10.00, acknowledging a broader range of silica sands with varying impurities.