• S. Md. Shahabudden
• Nazia Sultana

A gemstone is a mineral and in cut and polished form, is used to make jewellery or other adornments. Chalcedony is one of the important quartz mineral variety. Characteristically, it is a cryptocrystalline type of quartz. In India, Chalcedony was reported only from Maharashtra. The authors reported the occurrence of Chalcedony for the first time from Kolluru area of Guntur district, Andhra Pradesh, India. Physical and Optical properties are studied to identify the gemstone using Standard methods. The study found that the properties are consistent with Chalcedony.

Chalcedony, hardness, refractive index, pleochroism, fluorescence

"PHYSICAL AND OPTICAL PROPERTIES OF CHALCEDONY GEMSTONE- A CASE STUDY FROM KOLLURU AREA, GUNTUR DISTRICT, ANDHRA PRADESH, INDIA", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 4, page no.208-214, April-2020, Available :http://www.jetir.org/papers/JETIR2004235.pdf

"PHYSICAL AND OPTICAL PROPERTIES OF CHALCEDONY GEMSTONE- A CASE STUDY FROM KOLLURU AREA, GUNTUR DISTRICT, ANDHRA PRADESH, INDIA", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 4, page no. pp208-214, April-2020, Available at : http://www.jetir.org/papers/JETIR2004235.pdf