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Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable. Jewelers call this variety of the stone precious topaz . The best-known precious topaz gems range in color from rich yellow to light brown or pinkish red. Topaz is one of the hardest gem minerals. In the mineral table of hardness, it has a rating of 8, which means that a knife cannot cut it, and that topaz will scratch quartz.
The golden variety of precious topaz is quite uncommon. Most of the world s topaz is white or blue. The white and blue crystals of topaz are large, often weighing thousands of carats. For this reason, the value of topaz does not depend so much on its size as it does with diamonds and many other precious stones, where the value increases about four times with each doubling of weight. The value of a topaz is largely determined by its quality. But color is also important: blue topaz, for instance, is often irradiated to deepen and improve its color.
Blue topaz is often sold as aquamarine and a variety of brown quartz is widely sold as topaz. The quartz is much less brilliant and more plentiful than true topaz. Most of it is variety of amethyst: that heat has turned brown.
英语语法:anyone/any one;no one/none;every/each的区别
英语语法:many,much的区别
不定式的特殊句型too…to…
forget doing/to do的区别
英语语法:as + 形容词或副词原级 + as
短语动词的用法
不定式主语的语法知识
英语语法:every , no, all, both, neither, nor的区别
动词不定式的否定形式
英语语法:关系代词
动名词与不定式
英语语法:副词及其基本用法
英语语法:both, either, neither, all, any, none的区别
worth 的用法
形容词与副词的比较级
兼有两种形式的副词
英语语法:代词比较辩异 one,that 和it
英语语法:one/another/the other的区别
不定式的时态和语态
助动词should,would的用法
用形容词表示类别和整体
不定式的特殊句型so as to
不定式的特殊句型Why not
不定式作宾语的语法应用
助动词have的用法
以-ly结尾的形容词
助动词do 的用法
不定式作状语的语法应用
形容词及其用法
不定式作表语的语法应用
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