Before independence, India was subjugated by the British. This is an example sentence using subjugate.
CALL US NOW: +45 96 90 96 90. Home | Mining | Copper ores. The main copper sulphide minerals are chalcopyrite (CuFeS2) chalcocite (Cu2S), covellite (CuS), bornite (Cu5FeS4), tetrahedrite ((Cu,Fe)12Sb4S13) and enargite (Cu3AsS4). The largest source of copper is from porphyry ore deposits in which one or a combination of the aforementioned minerals occurs. A typical copper sulphide ore contains various levels of iron sulphide types that generally include pyrite (FeS2) and pyrrhotite (Fe1-xS).
Chalcocite, copper(I) sulfide (Cu 2 S), is an important copper ore mineral. It is opaque and dark-gray to black with a metallic luster. It has a hardness of 2Â½ - 3 on the Mohs scale. It is a sulfide with an orthorhombic crystal system.