- Tower Rock is a shonkinite saddle ridge.
- With the addition of alkali feldspar replacing or becoming more dominant than calcic plagioclase theralites grade into foidal syenite, including shonkinite.
- The Adel Mountains Volcanic Field in north-central Montana is a significant and abundant source of shonkinite, which is found primarily in Montana in the United States, Ontario in Canada, and the southwest Pacific Ocean island of Timor.
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