转关于苏纪石的国外资料 PS: 原来舒俱来还有个名字-----杉石

查了几天资料，发现网上的材料实在有限，重复居多，所以借着对舒的新鲜劲，开始查外文资料，顺便与大家分享。
以下是自己龟速翻译的，附上原文，因不是专业搞研究的，难免讲外行话，请高手发现谬误后务必指教。

Sugilite


Sugilite occurs as a microcrystalline aggregate and ranges in color from dark to medium purple, with variable amounts of dark or light mottling when chalcedony is present. Although a small percentage of the rough is translucent, most pieces seen on the market are opaque. The pure purple specimens which are nearly 100% Sugilite are 5 1/2 - 6 in hardness, while the pieces containing chalcedony may be 6 1/2 or higher and often have a more reddish purple color and/or distinctive patterning.
苏纪石是一种微晶聚合体，颜色变化范围由深紫到中紫，因伴生石英的存在而形成深浅不一的斑点。尽管有极少量的原石是透明或半透明体，大部分市面流通可见的通常是不透明体。舒含量接近100%的纯紫色标本硬度通常为5.5-6，而含伴生石英的标本硬度则可达到6.5或6.5以上，并且颜色更接近紫红且有独特的纹路。