previous month zodiac signs next month Topaz fact file Crystal Structure:orthorhombicChemical Composition:fluosilicate of aluminum Hardness:5-6 MOHSRefractive Index:colorless and blue topaz – 1.610 to 1.617yellow and brown topaz – 1.630 to 1.637Colors:Many colors including pink, blue, lavender, yellow, orange, orange-yellow, brownish…