MAY BE OPTION D IS CORRECT BUT I FOUND MOST APPROPRIATE IS OPTION C ....BELOW IS A GRAPH OF QUARTZ POLYMORPH YOU CAN SEE THE PRESSURE AND TEMPERATURE RANGE MUST BE VERY MUCH HIGH I...
Coesite and stishovite have a higher density than the low pressure polymorphs, in particular stishovite, which has a specific density of 4.29 g/cm3. While Coesite is still made of ...