(Blauquarz-Fundstelle, Grabenbachgebiet, Golling, Salzburg, Österreich)
Occurrence of blue quartz (also known as sapphire quartz), owing its colour to microscopic inclusions of magnesioriebeckite. The crystals, which are often associated to flawless rock crystals, occur in a vein disseminating a layer of carbonatite-silicate boulders formed by hydrothermal alteration of underlying Werfen slates. Part of the mineralization is genetically related to neighbouring melaphyr-diabases, providing the sodium needed for the formation of the alkali hornblendes.
This locality is known since the late 18th century. Located in the upper Grabenbach valley, about 5 km NE of Golling.
Ref.:
- A. Strasser: Die Minerale Salzburgs (1989)
