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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.

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Is gneiss soft or hard?

Gneiss is hard.


What group is gneiss in?

A Gneiss is a Metamorphic rock


Is gneiss folaited or nonfolaited?

Gneiss is foliated.


Does gneiss scratch glass?

Gneiss, a metamorphic rock composed of granular minerals, typically does not scratch glass. The hardness of gneiss generally ranges between 6 and 7 on the Mohs scale, while glass has a hardness of around 5.5. Therefore, while some minerals within gneiss may be hard enough to scratch glass, the rock itself usually does not have the consistent properties required to do so.


Is an gneiss rock sedimentary rock?

No, gneiss is metamorphic.


What are the characteristics of gneiss?

Gneiss is foliated and coarse grained


What is gneiss mineral group?

Gneiss is a rock, not a mineral.


How hard is it to drill through gneiss?

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)


Where would gneiss be in the US?

Gneiss is a part of the earths lower crust. No matter where you drill you will eventually uncover gneiss.


Is gneiss nonbanded?

No. Gneiss has alternating light and dark bands.


Can gneiss metamorphose into phyllite?

No. Phyllite can metamorphose into schist and then into gneiss.


Is gneiss an example of igneous rock?

No. Gneiss is a metamorphic rock.