Analysis
HTS 2530.90.10 covers natural cryolite; natural chiolite under heading 2530 (mineral substances not elsewhere specified or included).
Rates on the nearby lines range from duty-free to 2.9%. The costliest confusion would be with 2530.90.20 (natural micaceous iron oxides) at 2.9%, a difference of 2.9 points on the customs value.
There is no general-rate duty on this line, which puts it with roughly 91% of the 78 tariff lines in chapter 25 that are also free. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
The other lines in the same group are 2530.90.20 (natural micaceous iron oxides, 2.9%) and 2530.90.80 (other: other, duty-free).
Census statistics map these goods to NAICS 21239 (Other Nonmetallic Mineral Mining and Quarrying), an industry of 236 US establishments employing 10,238 people, the industry a domestic producer of these goods reports under.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 2530.90.20 | Natural micaceous iron oxides | 2.9% |
| 2530.90.80 | Other: other | Free |