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Igneous Rock
Igneous rock is formed from cooled magma or lava. The magma turns solid as it cools, and eventually becomes rock. It is sometimes crystallized.
1,149 Questions
No, granite is not considered permeable as it is a dense and non-porous rock. Water and other liquids cannot easily pass through its surface.
What is volcanic equivalent of norite?
The volcanic equivalent of norite is andesite. Both rock types are classified as intermediate in composition, with norite being a plutonic igneous rock and andesite being its volcanic counterpart formed from the same magma source.
Why pumice floats while a rock of similar size will sink in the same tank of water?
When pumice is formed - it traps minute amounts of gas in bubbles within the rock itself. This makes it buoyant.
Can igneous rock be molten again?
Yes, it can. Re-melting of igneous rock underground actually plays an important role in how magma chambers develop.
What is the difference between exclusive and intrusive rocks?
There is no such thing as an "exclusive" rock. However, there are extrusive rocks. These are divisions of igneous rocks, or rocks that form from molten rock. Intrusive rocks form from molten rock that has cooled underground. They can also be called plutonic rocks. Extrusive rocks, also called volcanic rocks, form from molten rock that has formed at or above the surface.
conchoidal fracture
No, anorthosite is not extrusive. Anorthosite is an intrusive igneous rock, meaning it forms from magma that cools and solidifies beneath the Earth's surface. Extrusive rocks, on the other hand, form from lava that cools and solidifies on the Earth's surface.
How can one identify a smokey quartz?
Smokey quartz is a beautiful of yellowish brown. When set in rings, necklaces or earrings the smokey quartz makes quite a statement. It is a very popular stone for medium priced jewelry.
Which characteristic provides the best evidence that pegmatite is solidified deep underground?
Very coarse texture.
How do you identify minerals I Me My We Our?
Minerals have certain properties, or characteristics, that help to identify them. Minerals can be identified by their color, luster, streak, cleavage, hardness, specific gravity, and even by their chemical composition.
What types of igneous rock cooled down from magma?
All igneous rock has been created from the cooling of magma or lava.
Why are there holes in someigneous rocks?
Some rocks have holes in them because they come out of a volcano as lava and the lava starts to harden but it doesn't turn into a rock straight away but the bubble of air pop leaving a whole so when the rock hardens its stays with all the hole.
