For iron sulfide, two elements (sulfur and iron) are heated together so that they form the compound iron sulfide. Although iron sulfide contains both sulfur and iron, it is not a mixture: it is a pure substance. Both the sulfur and the iron have 'given up' their individual properties to become a compound.
Granite is a hard igneous rock that is mostly made up of feldspar and quartz. Granite has a crystalline structure, and it can have a wide range of colors from grey to pink. The color of a granite rock is dependent upon the composition of minerals.Any igneous rock that contains one fifth of quartz is labeled as granite.ranite is a hard igneous rock that is mostly made up of feldspar and quartz. Granite has a crystalline structure, and it can have a wide range of colors from grey to pink. The color of a granite rock is dependent upon the composition of minerals.
These large crystals give the rock coarse (granite) to very coarse (pegmatite) texture. Granite typically has crystals of from 1 to 10 mm in size while pegmatite's crystals can be 10mm (1cm) and very much larger (see ESRT).They are non-vesicular (no gas pockets). Both are FELSIC and low density.ranite & Pegmatite. Both granite and pegmatite are made from the same minerals (pink zone in chart). These are silicates including potassium and plagioclase feldspars, quartz, biotite and amphibole.