Tag Archive for Opal

October Birthstone – Opal

opal-birthstone

previous month zodiac signs next month Opal fact file Crystal Structure:octahedron Chemical Composition: Quartz – Silicon dioxide, SiO2 Hardness: 5 ½ to 6 ½ MOHSRefractive Index: 1.43-1.46Colors: Body color – white or tan or bluish.Play colors – red, orange, yellow,…