In this specimen, we can observe various smoky quartz crystals, with a very uniform colour and exceptional transparence. They are disposed on a feldspar matrix, accompanied by various prismatic aegirine crystals with striated faces and a very intense black color. This specimen belongs from the Jaime Murria collection (Barcelona). 5y371a

Reserved

I initially classified this specimen as actinolite, but after some doubts I analysed it using SEM-EDS and X-ray diffraction (XRD). The results indicate that it is an aegirine, probably after arfvedsonite (striated prism...). A very good-sized specimen, with different crystals growing in parallel, shiny, with striated faces, and a clearly visible green colour. Pieces of this quality are almost impossible to obtain today. We will send the analyses to the buyer.

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A very good-sized specimen with an aggregate of brilliant aegirine crystals of an intense green, almost black colour, with well-defined faces and edges. It is accompanied by green fibrous crystals of arfvedsonite. They are disposed in a matrix of orthoclase crystals with quartz.

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