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# The Secret Summit of Mount Index
- URL: https://www.cascadepbs.org/show/nick-rocks/episode/the-secret-summit-of-mount-index-ze1lu3/
- Published: 2024-12-23T19:45:50.000Z
- Updated: 2025-12-12T19:29:46.000Z
- Description: Index granite is famous for its texture, but Mount Index contains more mysterious rock.
- Author: Cascade PBS Staff
- Tags: Nick on the Rocks, Season 6, Episode 4, #ZZZ_Episode_d593cae8-3b35-443e-b17f-00c4114fb591, #episode, #ZZZ_Show_fb43f9d5-44f4-411a-854a-568025965642, #v1.16

Index granite was used to build the iconic Smith Tower in Seattle, and it is known by climbers all over the world for its grippy quality. And while Mount Index consists mostly of the famous granite that shares its name, its peak is made of much older and more mysterious rock.