Is anyone able to comment on the crystalline structures in the second chapter? Copper's cubic unit of structure is described as a face-centered cubic arrangement with atoms at coordinates 0,0,0; 0,1/2,1/2; 1/2,0,1/2; 1/2,1/2,0. The iron cubic unit of structure is described as a body-centered arrangement. There are two atoms in the unit at coordinates 0,0,0 and 1/2, 1/2, 1/2. Also, what am I supposed to gather from the stereoscopic image? I'm having trouble imagining this spatially even with the diagrams. Most of the above is a direct quote from p25 in the Dover republication of General Chemistry.