shagreen Untanned sharkskin retaining the placoid scales;
鲨鱼皮保留盾鞣制鲨鱼皮;
shagreen Untanned sharkskin retaining the placoid scales;
鲨鱼皮保留盾鞣制鲨鱼皮;
(3) the observations and determination methods of form, cleavage, Becke line, shagreen surface, relief, pseudo-absorption, absorption, color, pleochroism of minerals under plane polarized light;
⑶单偏光镜下物形态、解理、多色、吸、面、突起、贝克线等观察与测定方法;
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