冰岛的火山学家托瓦杜？托达森表示，这次岛山冰川产生的火山灰的细腻程度是十分不寻常的。
The fineness of the ash in this case is unusual, says Thorvaldur Thordarson, an Icelandic volcanologist.
该天珠为，色泽分明、油亮润泽，纹路清晰自然、质感细腻圆润，表面有一定程度的风化纹，包浆厚重。
The beads of color clear, shiny and moist, clear lines of natural, mellow and delicate texture, a certain degree of surface weathering pattern, thick patina.
五看：质地主要是从石头的表层、石肤来看石头的硬度、密度与细腻、光洁的程度。
Five see: texture is mainly from the surface of the stone, stone skin to see the hardness of the stone, density and delicate, bright and clean degree.
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