The effect of heat treatment on physical properties of natural quartz from Khoaprangam, Lopburi

Abstract

This research aim to study physical properties of heat treatment natural quartz from Khaoprangam, Lopburi and in heat treatment the conduction for improving natural quartz by heat treatment. Natural quartz from local area were cut and burn at temperature of 200oC, 400oC, 600oC, 800oC and 1,000oC, respectively. At each temperature, two quartz were burn for 1 hour. Then, physical properties of the quartz were investigated comparing to unburned quartz Such as density, hardness, and optical properties, forms and crystals refraction. The results show that density of quartz 2.64 hardness 7.5, refraction of quartz 1.544 have SiO2 , optical properties 482 nm and 478 nm. In conclusion quartz which heat treatment at 200oC is bright and its physical properties are closet to natural quartz.