蓝色尖晶石 来自斯里兰卡 结晶良好的八面体 Blue spinels are not that common. This blue specimen from Sri Lanka is a remarkable example of its kind, being a well-crystallised octahedron of a rare blue
虹彩晶格长石 虹彩拉长石 The tiny Utnerrengatye mine in Harts Range, Northern Territory, Australia. Rainbow lattice feldspar was discovered there in 1985 and acknowledged as a new gem material in 1989
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