There is high tantalite grade for certain large scale granite - pegmatite pattern tantalite - columbite mine in our country.
我国某大型花岗伟晶岩型铌钽矿含钽品位高居我国钽铌矿山之首.
At pegmatite contacts the composition changes to chalcopyrite, millerite, pyrite, and accompanied by magnetite and hematite.
在伟晶岩接触带,硫化物成分变为黄铜矿 、 针镍矿 、 黄铁矿及硫镍铁矿, 伴生有磁铁矿和赤铁矿.
Li - Be - Ta - Nb - bearing deposits in Lianyun Mountain on thewing of Lianyun Mountain anticline the densely distributed pegmatite area.
连云山上石含锂铍钽铌矿床位于连云山背斜南翼上石伟晶岩密集区,其地层为板溪群二云母片岩.