2007-03-09 16:12:13 · 3 answers · asked by buslc36 2 in Science & Mathematics ➔ Earth Sciences & Geology
Granite and diorite are members of the Grano-diorite Family. The best method is to determine the type of feldspars and to look at the total amount of quartz. Granite must have both potassium feldspar and plagioclase feldspar. Diorite shouldn't have any potassium feldspar. In regards to quartz, a granite must have 35% quartz and a diorite can't have more than 5% quartz. This is sometimes misleading, for there is a granite in my city where the quartz is micro-crystalline and cannot be seen without cutting a thin section and looking under a microscope. This is an unusual case though.
2007-03-10 01:40:10 · answer #1 · answered by Amphibolite 7 · 0⤊ 0⤋
Check the ratios of certain minerals such as quartz. Also remember how the mineral originates and where. You would best get this mountain of information by using DIORITE as the search term or starting with Wikipedia and following that out to the specific data you need.
2007-03-10 00:24:26 · answer #2 · answered by Draken 2 · 0⤊ 0⤋
look for dark mafic materials . Diorite is salt and peper looking granite is mostly composed of felsic minerald such as quartz, biotite, feldspars and sometimes hornblende
2007-03-10 00:36:18 · answer #3 · answered by magnetic__reversal 2 · 1⤊ 0⤋