自从在自然界发现含烧禄石碳酸岩型铌矿床以来,知道Nb_2O_5在碳酸岩内含量远远高出于其他各类岩浆岩和沉积岩。据佩克腊资料,Nb_2O_5在碳酸岩中平均含量为0.001—0.9％,在碱性岩中为0.001—0.05％,在辉 Since the discovery of burnt-pebble-type niobium deposits in nature, it is known that the content of Nb 2 O 5 in carbonate rocks is much higher than that of other types of magmatic rocks and sedimentary rocks. According to the Peikla data, Nb 2 O 5 is present in an average amount of 0.001-0.9% in carbonate rocks and 0.001-0.05% in alkaline rocks.