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A vesicular igneous texture generally indicates rapid cooling.
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Large crystal grains in an igneous rock are an indication that crystals formed?
1. Over long period of time
Which rocks has two different size grains of the same mineral?
The rock is conglomerate. The other rock would be Breccia if its grains were not rounded.
how and where would the rock might have been formed that has large crystals of feldspar mica and quartz?
due to the large crystal grains of the rock and existence of feldspar and mica the rock could either be of igneous or metamorphic origin.incase it is of igneous origin the rock is intrusive igneous rock that form deep in the earth crust and cool at a relatively slow rate developing large crystals.in case of metamorphic origin the rock is high grade metamorphic rock that have experienced high metamorphic condition (high pressure and temperature);that is it is a gneiss that has characteristic coarse grains crystals.
What type igneous is pumice intrusive small crystal or extrusive large crystal?
It is neither. Pumice is an extrusive highly vesicular igneous rock composed of volcanic glass and very tiny mineral crystals.
What is the textural difference between coarse-grained phaneritic and fine-grained aphanitic rocks?
Phaneritic rock has visible identifiable crystal grains. Aphanitic rock has crystal grains that are too small to be visible with the naked eye. In igneous rock, the difference is due to the amount of time spent in cooling. Long term cooling of magma underground leads to large crystals, rapid cooling of lava above ground leads to small crystal texture.
Large crystal grains in an igneous rock are an indication that crystals formed?
1. Over long period of time
Lin found an igneous rock with large grains of mineral crystal where did this rock most likely form?
d. on the surface of the Earth
Does slow cooling of igneous rocks form large or small crystal grains?
Slow cooling of igneous rocks typically forms large crystal grains. This is because slow cooling allows more time for mineral grains to grow, resulting in larger crystals. Examples of rocks formed through slow cooling and having large crystal grains include granite and gabbro.
Igneous rock that forms deep inside the earth and has large mineral grains is called?
Intrusive igneous rock.
Which one has large grains between intrusive and extrusive igneous rocks?
intrusive
Do extrusive igneous rocks have small grains since intrusive has large?
That is correct.
Which rocks has two different size grains of the same mineral?
The rock is conglomerate. The other rock would be Breccia if its grains were not rounded.
What does an igneous rock's crystal grain size indicate to the observer?
The size of the mineral crystals in an igneous rock is related to the rate of time spent in cooling from magma. Longer exposure to the crystallization temperature means larger crystals. Less time means smaller crystals, or in the case of obsidian, which cools extremely quickly, no crystallization.
how and where would the rock might have been formed that has large crystals of feldspar mica and quartz?
due to the large crystal grains of the rock and existence of feldspar and mica the rock could either be of igneous or metamorphic origin.incase it is of igneous origin the rock is intrusive igneous rock that form deep in the earth crust and cool at a relatively slow rate developing large crystals.in case of metamorphic origin the rock is high grade metamorphic rock that have experienced high metamorphic condition (high pressure and temperature);that is it is a gneiss that has characteristic coarse grains crystals.
What type igneous is pumice intrusive small crystal or extrusive large crystal?
It is neither. Pumice is an extrusive highly vesicular igneous rock composed of volcanic glass and very tiny mineral crystals.
What are large grains of intrusive rock that cools down slowly?
Intrusive Igneous rocks. Examples: obsidian, magma
What is the textural difference between coarse-grained phaneritic and fine-grained aphanitic rocks?
Phaneritic rock has visible identifiable crystal grains. Aphanitic rock has crystal grains that are too small to be visible with the naked eye. In igneous rock, the difference is due to the amount of time spent in cooling. Long term cooling of magma underground leads to large crystals, rapid cooling of lava above ground leads to small crystal texture.
