求大神帮我鉴定这是什么石头?里面有晶体硅熔点高硬度大，硬度能划玻璃。谢谢

来源：蜘蛛抓取(WebSpider) 时间：2017-02-05 04:51 标签： 晶体与非晶体硬度
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这是什么石头硬度比玻璃大在光下是透明的
紫水晶的成分是二氧化硅,硬度7 ,比重2.65,折射率1.54-1.55,具二向色性.从不同角度观赏,可显示出蓝或红的紫色调,通常以混合式或阶式做成刻面.天然产出的紫水晶因含铁、锰等矿物质而形成漂亮的紫色,主要颜色有淡紫色、紫红、深红、大红、深紫、蓝紫等颜色,以深紫红和大红为最佳,过于淡的紫色则较为平常.天然紫晶通常会有天然冰裂纹或白色云雾杂质.具有宝石价值的紫晶均产在火山岩、伟晶岩、或灰岩、页岩的晶洞中.紫晶在自然界分布广泛,主要产地有巴西、俄罗斯、南非、马达加斯加.
这块怎样'好吗
顶级：晶体通透，肉眼观察无棉絮、无冰裂、无杂质、无划伤，做工精湛，完美无暇。
3A级：晶体通透，肉眼观察有极少量棉絮或冰裂、无划伤，做工精湛，接近完美。
2A级：晶体通透，含少量棉絮、冰裂、瑕疵，做工欠佳。
A级及以下：晶体些许浑浊，较多棉絮、冰裂和瑕疵。
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水晶的？？？？。。。。。。。。。
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