GRE写作范文——Topaz
<p> <span word="Topaz">Topaz</span> <span word="is">is</span> <span word="a">a</span> <span word="hard">hard</span>, <span word="transparent">transparent</span> <span word="mineral">mineral</span>. <span word="It">It</span> <span word="is">is</span> <span word="a">a</span> <span word="compound">compound</span> <span word="of">of</span> <span word="aluminum">aluminum</span>, <span word="silica">silica</span>, <span word="and">and</span> <span word="fluorine">fluorine</span>. <span word="Gem">Gem</span> <span word="topaz">topaz</span> <span word="is">is</span> <span word="valuable">valuable</span>. <span word="Jewelers">Jewelers</span> <span word="call">call</span> <span word="this">this</span> <span word="variety">variety</span> <span word="of">of</span> <span word="the">the</span> <span word="stone">stone</span> <span word="precious">precious</span> <span word="topaz">topaz</span>. <span word="The">The</span> <span word="best">best</span>-<span word="known">known</span> <span word="precious">precious</span> <span word="topaz">topaz</span> <span word="gems">gems</span> <span word="range">range</span> <span word="in">in</span> <span word="color">color</span> <span word="from">from</span> <span word="rich">rich</span> <span word="yellow">yellow</span> <span word="to">to</span> <span word="light">light</span> <span word="brown">brown</span> <span word="or">or</span> <span word="pinkish">pinkish</span> <span word="red">red</span>. <span word="Topaz">Topaz</span> <span word="is">is</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="hardest">hardest</span> <span word="gem">gem</span> <span word="minerals">minerals</span>. <span word="In">In</span> <span word="the">the</span> <span word="mineral">mineral</span> <span word="table">table</span> <span word="of">of</span> <span word="hardness">hardness</span>, <span word="it">it</span> <span word="has">has</span> <span word="a">a</span> <span word="rating">rating</span> <span word="of">of</span> 8, <span word="which">which</span> <span word="means">means</span> <span word="that">that</span> <span word="a">a</span> <span word="knife">knife</span> <span word="cannot">cannot</span> <span word="cut">cut</span> <span word="it">it</span>, <span word="and">and</span> <span word="that">that</span> <span word="topaz">topaz</span> <span word="will">will</span> <span word="scratch">scratch</span> <span word="quartz">quartz</span>.</p><p> <span word="The">The</span> <span word="golden">golden</span> <span word="variety">variety</span> <span word="of">of</span> <span word="precious">precious</span> <span word="topaz">topaz</span> <span word="is">is</span> <span word="quite">quite</span> <span word="uncommon">uncommon</span>. <span word="Most">Most</span> <span word="of">of</span> <span word="the">the</span> <span word="worlds">worlds</span> <span word="topaz">topaz</span> <span word="is">is</span> <span word="white">white</span> <span word="or">or</span> <span word="blue">blue</span>. <span word="The">The</span> <span word="white">white</span> <span word="and">and</span> <span word="blue">blue</span> <span word="crystals">crystals</span> <span word="of">of</span> <span word="topaz">topaz</span> <span word="are">are</span> <span word="large">large</span>, <span word="often">often</span> <span word="weighing">weighing</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="carats">carats</span>. <span word="For">For</span> <span word="this">this</span> <span word="reason">reason</span>, <span word="the">the</span> <span word="value">value</span> <span word="of">of</span> <span word="topaz">topaz</span> <span word="does">does</span> <span word="not">not</span> <span word="depend">depend</span> <span word="so">so</span> <span word="much">much</span> <span word="on">on</span> <span word="its">its</span> <span word="size">size</span> <span word="as">as</span> <span word="it">it</span> <span word="does">does</span> <span word="with">with</span> <span word="diamonds">diamonds</span> <span word="and">and</span> <span word="many">many</span> <span word="other">other</span> <span word="precious">precious</span> <span word="stones">stones</span>, <span word="where">where</span> <span word="the">the</span> <span word="value">value</span> <span word="increases">increases</span> <span word="about">about</span> <span word="four">four</span> <span word="times">times</span> <span word="with">with</span> <span word="each">each</span> <span word="doubling">doubling</span> <span word="of">of</span> <span word="weight">weight</span>. <span word="The">The</span> <span word="value">value</span> <span word="of">of</span> <span word="a">a</span> <span word="topaz">topaz</span> <span word="is">is</span> <span word="largely">largely</span> <span word="determined">determined</span> <span word="by">by</span> <span word="its">its</span> <span word="quality">quality</span>. <span word="But">But</span> <span word="color">color</span> <span word="is">is</span> <span word="also">also</span> <span word="important">important</span>: <span word="blue">blue</span> <span word="topaz">topaz</span>, <span word="for">for</span> <span word="instance">instance</span>, <span word="is">is</span> <span word="often">often</span> <span word="irradiated">irradiated</span> <span word="to">to</span> <span word="deepen">deepen</span> <span word="and">and</span> <span word="improve">improve</span> <span word="its">its</span> <span word="color">color</span>.</p><p> <span word="Blue">Blue</span> <span word="topaz">topaz</span> <span word="is">is</span> <span word="often">often</span> <span word="sold">sold</span> <span word="as">as</span> <span word="aquamarine">aquamarine</span> <span word="and">and</span> <span word="a">a</span> <span word="variety">variety</span> <span word="of">of</span> <span word="brown">brown</span> <span word="quartz">quartz</span> <span word="is">is</span> <span word="widely">widely</span> <span word="sold">sold</span> <span word="as">as</span> <span word="topaz">topaz</span>. <span word="The">The</span> <span word="quartz">quartz</span> <span word="is">is</span> <span word="much">much</span> <span word="less">less</span> <span word="brilliant">brilliant</span> <span word="and">and</span> <span word="more">more</span> <span word="plentiful">plentiful</span> <span word="than">than</span> <span word="true">true</span> <span word="topaz">topaz</span>. <span word="Most">Most</span> <span word="of">of</span> <span word="it">it</span> <span word="is">is</span> <span word="variety">variety</span> <span word="of">of</span> <span word="amethyst">amethyst</span>: <span word="that">that</span> <span word="heat">heat</span> <span word="has">has</span> <span word="turned">turned</span> <span word="brown">brown</span>.</p><p> </p>
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