苏纪石的历史
舒俱来最早于1944年在日本岩手县被发现，由地质学家杉健一（Kenichi Sugi）命名。[1]有文献推断舒俱来为碱性热水溶液流经碳酸盐型锰矿时，产生气液变质作用而成，属于矽卡岩。[2]全球主要产地集中在南非（如韦塞尔锰矿）、日本及加拿大等地，其中南非为高品质宝石级舒俱来的主要供应地。舒俱来莫氏硬度为5.5-6.5，密度约2.74-2.79 g/cm³，具有弱至中等荧光性（长波紫外线下呈橙红色）。其颜色成因与锰、铁等过渡金属元素的电子跃迁有关，部分深紫色品种因含微量钒元素而更显浓郁。按颜色与透明度可分为皇家紫（高饱和度紫色）、樱花紫（粉紫色交织）及冰种（半透明）等类别。
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