Foyaite Igneous Rock from Monchique complex, Monchique, Faro, Portugal

Contributed by: Daniel C. Montero
Date: May 4th, 2026
Locality: Monchique Complex, Monchique, Faro, Portugal (See on Mindat)

Description:
A nepheline syenite with predominant orthoclase and a trachytic texture.
These are rich in fluorescent Sodalite

Originally posted by Daniel C Montero on Nature's Rainbows in 2023.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Sodalite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: Orange