Gneiss is hard.
Typically very hard, imagine drilling into a granite top at your local cocktail bar... Imagine it twice as hard... Now in terms of drilling in all boils down to the amount of air pressure you have going DTH to break and pulverize the gneiss. Typically, if one would use a 24bar 1170 cfm compressor, drilling a 6"dia hole, you will drill roughly 4-8m per hour. This is our averages in Archean granites and gneiss. It takes way much longer if you have less air pressure (less than 21bars / 300psi)
I am trying to find out what the other two types of rock besides gneiss form the Matterhorn. Gneiss is a metamorphic rock. That's a nice piece of gneiss!
A fractured surface--rough. A polished or worn surface--smooth.
Zinc is considered a hard metal; its hardness is similar to that of Iron.
Gneiss is composed of mineral grains that are arranged into distinct layers or bands. The most common minerals found in gneiss include quartz, feldspar, and mica. The banding in gneiss is a result of intense heat and pressure during its formation, causing the minerals to segregate into layers.
Gneiss is metamorphic rock that forms from preexisting sedimentary or igneous rocks. It is developed under high temperature and pressure conditions, causing it to become hard.
There are types of igneous rocks that are hard (eg granite) and others that are soft (eg volcanic ash). There are types of metamorphic rocks that are hard (eg gneiss) and others that are soft (eg marble). Thus "hardness" is not a characteristic that can be used to distinguish between the two.
Hard
it is hard and sometimes soft
hard
soft you can bend and hard you can not
soft
Soft
"Treated wood can be soft or hard." But, generally what is bought from a lumberyard is soft.
is larch wood soft or hard wood
one is soft and the other is hard
Solid is hard. It is nt soft.