what is meant by the term you mentioned in the last?
The diamond cubic crystal structure is a repeating pattern of 8 atoms that certain materials may adopt as they solidify.
Diamond cubic
The diamond cubic crystal structure is a repeating pattern of 8 atoms that certain materials may adopt as they solidify. While the first known example was diamond, other elements in group 14 also adopt this structure, including α-tin, the semiconductors silicon and germanium, and silicon/germanium alloys in any proportion.

we know that diamonds did not form from coal because UNANSWERABLE can you state any of its properties? Yes -  It is the hardest and least compressible. It has the highest thermal conductivity and the highest sound velocity. It has low adhesion and friction, and its coefficient of thermal expansion is extremely low. Its optical transparency extends from the far infrared to the deep ultraviolet and it has high optical dispersion. It also has high electrical resistance. It is chemically inert, not reacting with most corrosive substances, and has excellent biological compatibility. when was it discovered? Diamonds are thought to have been first recognized many centuries ago 3,000years but most likely 6,000years how is it used politically? UNANSWERABLE what is its status in space? They are very common in space. is there any carbon content in it? Yes - Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic.
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Diamond cubic [SEP] Introduction
The diamond cubic crystal structure is a repeating pattern of 8 atoms that certain materials may adopt as they solidify. While the first known example was diamond, other elements in group 14 also adopt this structure, including α-tin, the semiconductors silicon and germanium, and silicon/germanium alloys in any proportion. Although often called the diamond lattice, this structure is not a lattice in the technical sense of this word used in mathematics.