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  1. Topaz | Uses and Properties of the Mineral and Gem

    • Topaz is a rare silicate mineral with a hardness of 8 and a wide range of natural and treated colors. Learn about its physical and chemical characteristics, geologic occurrence, and popularity as a births… See more

    Overview

    Topaz is one of the Mohs hardness minerals and has been an important gemstone for thousands of years. It occurs in a wide range of colors, many of which are produc… See more

    Geology.com
    What Is Topaz?

    Topaz is a rare silicate mineral with a chemical composition of Al2 SiO4 (F,OH)2. It is best known … See more

    Geology.com
    Topaz - The November Birthstone

    Topaz is the original modern birthstone for the month of November. Its status as a traditional birthstone contributes significantly to the gem's popularity and is the reason … See more

    Geology.com
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