01 / Aegirine syenite (エジル石閃長岩)
Three new minerals have beenfound in Iwagi Island's rock.

The prefectural natural monument "aegirine syenite" (エジル石閃長岩) is rock from Iwagi Island. Sugilite (1970s) and katayamalite (1983) were found in it, and murakamiite, approved in 2016, comes from the same island. The photo shows a specimen containing katayamalite.
- Prefectural natural monument (designated Mar. 8, 1968)
- Sugilite, katayamalite and murakamiite are new minerals
- Murakamiite approved as a new species on Oct. 7, 2016
