idocrase
/ˈaɪdəʊkreɪs/noun
mass noun
- a mineral consisting of a silicate of calcium, magnesium, and aluminium, occurring typically as dark-green to brown prisms in metamorphosed limestone符山石（由钙、镁、铝硅酸盐组成, 多为暗绿至棕色变质石灰石结晶柱）。
词源
early 19th cent.: from Greek eidos 'form' + krasis 'mixture'.