Tag Archive for Tourmaline

October Birthstone – Tourmaline


previous month zodiac signs next month > Tourmaline fact fileCrystal Structure: long and sub-triangular Chemical Composition: silicate of Boron and Aluminum Hardness: 7-7.5 MOHS Refractive Index: 1.620 and 1.640 Colors: black, red, pink, green, and blue “Watermelon” colors – red…

October Birthstone – Opal


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,…