 
 <prompt> Multiple chunks of copper. Based on di last question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: Copper dey come out from big stars and e dey inside Earth crust for concentration of about 50 parts per million (ppm), where e dey as native copper or inside minerals like copper sulfides chalcopyrite and chalcocite, copper carbonates azurite and malachite, and copper(I) oxide mineral cuprite. The biggest mass of copper wey dem discover weigh 420 tonnes and dem find am for 1857 for Keweenaw Peninsula for Michigan, US. Native copper na polycrystal, with the biggest single crystal wey dem describe measure 4.4×3.2×3.2 cm. 