Tag: Tourmaline

October Birthstone – Tourmaline

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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…

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October Birthstone – Opal

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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,…

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