Gneiss. It is a high grade metamorphic rock, having been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock.
Gneiss is the metaphoric rocks would most likely have formed at the highest temperatures and pressures.
<u>EXPLANATION:</u>
Gneiss is known as a metaphoric rock which is designed in the shape of sedimentary or igneous rock which have a very high tendency of temperature up to 320 degrees Celsius with high pressure.
This kind of rock can withstand a heavy amount of load. Gneiss is a rock which is made out of 6-7 range when measured in Mohs scale.
