Homework / test English to Russian Science Geology

Например, в таком предложении:

This work concluded that the deposit was a complex interbedding of shales, ***magnetite ores*** and limestone which would suggest a skarn type deposit especially as the ore zone had been subjected to contact metamorphism (transformation into granite) at the boundaries.

Или в таком:

Although three types of ore were identified: magnetite, magnetite-haematite, and a magnetic pyhrrotite, only the magnetite was considered to have any industrial significance.

Как все-таки правильно перевести это на русский? Магнетитная руда? Магнитная руда? Магнетитовая?