Petrographic and Gemological Characteristics of Nephrite of Shinuray Village, Tagab District, Kapisa Province

چکیده

Nephrite is a well-known variety of jade composed predominantly of amphibole minerals (tremolite–actinolite series) and is classified as a semi-precious stone. It is widely used in jewelry making and ornamental objects. In terms of its macroscopic characteristics, nephrite shows strong similarities to serpentinite and jadeite; therefore, detailed petrographic, mineralogical, and gemological investigations are essential for its accurate identification. Numerous nephrite occurrences have been reported from different regions of Afghanistan, one of which is located in Shinwari village, Kapisa Province. Considering the significance of this semi-precious stone in the carving industry and commercial markets, the present study focuses on determining the petrographic and gemological characteristics of nephrite from the Shinwari locality in Kapisa Province. The main objective of this research is to define the petrographic features, gem quality, and mineral composition of nephrite in the study area. This study employs a combination of literature review, fieldwork, and laboratory methods. Laboratory analyses include thin section preparation, X-ray fluorescence (XRF), determination of refractive index, and specific gravity measurements. The results of the analyses indicate that the nephrite from this area exhibits good gem quality and belongs to the actinolite-type nephrite.

Keywords: Nephrite Stone, Gem Quality, Semi-precious Stones, Actinolite nephrite and Shinuray Village