Granite, after metamorphism transforms to
- Aquartzite
- Bslate
- Cschist
- DgneissCorrect
Solution
Concept
Metamorphic transformation of granite rock
Formula
NONE
Step-by-step solution
1. Granite is an igneous rock composed mainly of quartz, feldspar, and mica. 2. Under intense heat and pressure, granite undergoes regional metamorphism. 3. The metamorphic process transforms granite into a foliated metamorphic rock known as gneiss. Answer: D
Explanation
Granite is an igneous rock predominantly composed of quartz and feldspar minerals. When subjected to intense heat and directed pressure during regional metamorphism, its mineral grains realign into distinct light and dark bands, transforming it into gneiss. Sandstone transforms into quartzite, while shale transforms into slate.
Why the other options are wrong
A) Quartzite is formed from the metamorphism of sandstone. B) Slate is formed from the metamorphism of shale or mudstone. C) Schist is formed from the metamorphism of slate, phyllite, or basalt.
Shortcut
Granite metamorphoses into Gneiss (remember "G" to "G").
Common mistake
Confusing gneiss, the metamorphic product of granite, with quartzite or slate.
Correct answer: D) gneiss