Estudio refractométrico y conoscópico de las gemas facetadas transparentes birrefringentes de la colección del Museo de Geologia de Barcelona

Abstract

Refractometric and conoscopic study of faceted transparent birrefringent gems of the collection of the Museu de Geologia of Barcelona

This work is a revision of faceted transparent birrefringent gems detailed in the catalogue of the collection of the Museu de Geologia published in 2000. The process use figures of interference as especially convincing method for a correct identification of these kind of gems. The Conoscope Figueras 93 is especially suitable for a clear and correct observation of figures of interference.
The gemmological refractometer has been used for refractometric readings.