Gneiss is a high grade metamorphic rock. It can withstand very high temperatures and pressures than schist, a medium grade metaphoric rock. Since it is a rock, it is made up of many different minerals and does not have a chemical formula. Gneiss is formed by the metamorphosis of granite or sedimentary rock. Gneiss displays distinct foliation, representing alternating layers composed of different minerals. It is found in western Greenland comprise the oldest crustal rocks known (more than 3.5 billion years old). Gneiss is an old German word meaning bright or sparkling.
When I first chose this rock, no one knew what it was. I searched online for a while and found nothing that was exactly like my rock. When I did the rock identifier, it told me I had gneiss, but my rock looked nothing like it. I was confused and just left it as gneiss. No one still knows what it is, even when we described it in Google.
I chose to shape my rock this way because it was really uneven when I first chose it. In the first picture, it had an odd curve to it, so I had Jiapsi cut it to make a rectangular prism. I originally wanted to facet the rock, but it was too small and wide to shape it into that. I thought this rock was cool at first, but once I grinded it down, it wasn't as pretty as it was naturally. I feel like I kind of messed it up and took away all it's nice looking layers.
When I first chose this rock, no one knew what it was. I searched online for a while and found nothing that was exactly like my rock. When I did the rock identifier, it told me I had gneiss, but my rock looked nothing like it. I was confused and just left it as gneiss. No one still knows what it is, even when we described it in Google.
I chose to shape my rock this way because it was really uneven when I first chose it. In the first picture, it had an odd curve to it, so I had Jiapsi cut it to make a rectangular prism. I originally wanted to facet the rock, but it was too small and wide to shape it into that. I thought this rock was cool at first, but once I grinded it down, it wasn't as pretty as it was naturally. I feel like I kind of messed it up and took away all it's nice looking layers.