鄂东南一带的铁矿床中,有一种粉砂状矿石.这种矿石的构造特别疏松,采取标本时稍用力即成粉砂状,因此,对其制作光片一直是没有得到解决的问题.近来经过多次实验,取得了初步成果,总结如下: 标本采取参照土工实验的取样方法,采用环刀取样.环刀是用直径为30毫米、长为20毫米、壁厚1毫米的铁(铜)管制成.取样时将环刀插进保持原始结构的粉矿里,然后将环刀外围粉矿剥开,再将环刀连同标本一起取下,用塑料薄膜轻包即成. In the southeastern part of Hubei Province, there is a silt-shaped ore, which is especially loose in structure and slightly harder to be silted when taken. Therefore, it has always been an unresolved issue for making light flakes. Recently, many experiments have been made and preliminary results have been obtained, which are summarized as follows: Specimens taken by reference to the geotechnical test sampling method, the ring knife sampling ring knife is a diameter of 30 mm, a length of 20 mm, a wall thickness of 1 mm of iron ) Into the ring when the sample will be inserted into the ring cutter to maintain the original structure of the powder mine, and then the ring knife outside the powder ore stripped, and then remove the ring knife together with specimens, with plastic film light package Serve.