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Does obsididan rock have large mineral grains?
No. Obsidian is formed by the very rapid cooling of lava which means that crystals do not have time to form.
What is an example of extrusive rock that has cooled too quickly for grains to form?
Obsidian, which is volcanic glass, is a good example.
When water combines with mineral grains do the grains become smaller or larger?
When water combines with mineral grains, the grains become larger. The increase in size of mineral grains strains the rock material and weakens it.
What type of grains does metamorphic rock have?
Metamorphic rock may have coarse, flattened, or aligned mineral grains.
If you found a rock with flat mineral grains which rock would it be?
Metamorphic Rock
Which rock has large mineral grains granite obsidian basalt or pumice?
Granite
Which rock is very smooth and has no visible mineral grains?
Glassy textuered rocks, such as Obsidian.
Does obsidian a glassy rock have a large grain size or a small grain size?
Actually, obsidian doesn't have grains at all. Technically obsidian is a glass, which means it has no internal structure. When geologists refer the the grain size of a rock, they mean how big the crystals that make it up are. Since obsidian has no crystals, it therefore has no grain size.
Does obsididan rock have large mineral grains?
No. Obsidian is formed by the very rapid cooling of lava which means that crystals do not have time to form.
What does rock contain?
Molten rock contains liquified minerals, some solid mineral grains, and dissolved gasses.
What rock has large mineral grains?
Fine grains of rocks are referred to as "clasts." The word "clast" comes from the Greek word "klastos," meaning "broken."
Must all rocks form crystals?
All rock does not contain mineral crystals. Obsidian, or volcanic glass, in particular is a rock that has cooled so quickly from lava that mineral crystals were not able to form.
What does contain?
Molten rock contains liquified minerals, some solid mineral grains, and dissolved gasses.
What is an example of extrusive rock that has cooled too quickly for grains to form?
Obsidian, which is volcanic glass, is a good example.
Is sandstone a mineral?
No. Sandstone is not a mineral, it is a rock type.
Does rock always have to contain a mineral?
A rock will always contain at least one mineral.
What is a rock with long flat mineral grains?
A metamorphic rock
