To convert a signed binary int to a decimal number, use the following algorithm. We illustrate the algorithm on two four-bit examples: 1110 and 0101. If the leftmost bit is a 1, the number is negative. Do the following... (1110 starts with a 1.
Copper pyrites is a common name for the mineral chalcopyrite, which has a formula CuFeS2. It can be considered to be made up of Cu+ Fe3+ S2- ions but there is covalent character.
Pyrrhotite has the formulae FeS and a relative hardness of 5. It is a magnetic common mineral often found in igneous rocks. It is mined for the nickel minerals such as nickel-iron, NiFe, and annabergite, Ni3(AsO4)2.8H20, associated with it. Quartz. Quartz has the formulae SiO2 and a relative hardness of 7.