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quartz has great economic importance. many varieties are gemstones, including amethyst, citrine, smoky quartz, and rose quartz. sandstone, composed mainly of quartz, is an important building stone. large amounts of quartz sand (also known as silica sand) are used in the manufacture of glass and ceramics
quartz has great economic importance. many varieties are gemstones, including amethyst, citrine, smoky quartz, and rose quartz. sandstone, composed mainly of quartz, is an important building stone. large amounts of quartz sand (also known as silica sand) are used in the manufacture of glass and ceramics...
https://www.mustanglink.com/quartz.html
quartz has great economic importance. many varieties are gemstones, including amethyst, citrine, smoky quartz, and rose quartz. sandstone, composed mainly of quartz, is an important building stone. large amounts of quartz sand (also known as silica sand) are used in the manufacture of glass and ceramics
quartz has great economic importance. many varieties are gemstones, including amethyst, citrine, smoky quartz, and rose quartz. sandstone, composed mainly of quartz, is an important building stone. large amounts of quartz sand (also known as silica sand) are used in the manufacture of glass and ceramics...
http://www.mustanglink.com/quartz.html