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A mixture of sand and clay, mudstone, metamorphose (process of changing from one type of rock into a metamorphic rock) into gneiss rocks or schist rocks. The mudstones would change under heat and pressure to make the new Metamorphic rocks.

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βˆ™ 13y ago
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βˆ™ 6mo ago

Gneiss was originally formed from igneous or sedimentary rocks that underwent metamorphism due to heat and pressure. These precursor rocks could have been granite, shale, or other rocks that were transformed into gneiss through the metamorphic process.

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βˆ™ 15y ago

Either Igneous or Sedimentary. Metamorphic rocks form from either intense heat, intense pressure, or intense heat and pressure. So both Igneous and Sedimentary rocks can form Metamorphic Rocks.

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βˆ™ 13y ago

A mixture of sand and clay, mudstone, metamorphose (process of changing from one type of rock into a metamorphic rock) into gneiss rocks or schist rocks. The mudstones would change under heat and pressure to make the new Metamorphic rocks.

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βˆ™ 10y ago

Yes. Gneiss is a high-grade metamorphic rock.

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βˆ™ 12y ago

It is limestone before it is altered by heat and pressure

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βˆ™ 10y ago

Gneiss can form either from granite or schist. Schist itself a metamorphic rock which can often be traced back to sedimentary rocks such as shale.

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βˆ™ 15y ago

Granite, an igneous rock

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Q: What was gneiss before it undertook heat and pressure?
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Related questions

Put some heat and pressure on granite and you'll get?

Gneiss, if the heat and pressure are sufficient.


How does Granite turn to gneiss?

by adding heat and pressure


What type of rock forms when heat and pressure is put on granite?

When heat and pressure are applied to granite, it transforms into a metamorphic rock called gneiss. Gneiss typically exhibits banded textures and can contain minerals such as quartz, feldspar, and mica that have been reoriented due to the intense pressure and heat.


How does the rock granite change to the rock gneiss?

Heat and pressure


If granite were subjected to intense heat and pressure it would likely change to?

If granite were subjected to intense heat and pressure, it would likely change to gneiss, a metamorphic rock. Gneiss forms through the recrystallization of minerals in granite under high temperature and pressure conditions.


What does granite rock turn into after heat and pressure?

Granite will become gneiss.


When granite is changed by heat and pressure it becomes what metamorphic rock?

gneiss


When shale is exposed to heat and pressure this metamorphic rock is formed?

gneiss


What do heat and pressure change shale to?

Heat and pressure change shale into metamorphic rock, specifically slate when exposed to low to moderate levels of heat and pressure, and then further into phyllite, schist, and gneiss as the intensity of heat and pressure increases.


What causes granite to transform into gneiss?

It is impossible for granite to turn into gneiss it is a scientific impossibility that cannot be done with only heat and pressure :)


What metamorphic rock does granite turn into after heat and pressure?

Granite will become gneiss.


What group of rock does gneiss belong in?

Metamorphic, because it is formed with heat and pressure