No. Small crystals form.
Small crystals are likely to form when the solution cools quickly or when there are impurities present that inhibit crystal growth. Large crystals are likely to form when the solution is allowed to cool slowly or when there is a high concentration of solute in the solution.
Pumice is made of glass. Glass forms when molten rock cools too quickly for crystals to form.
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glassy texture, hope this helps :)
When molten rock cools slowly, it will have a lot of time to form crystals, so the crystal size will be quite big. Take granite, for example. With the naked eye, you can see the individual crystals. The grain size is quite large. The kind of mineral that forms is dependent on the composition of the magma.
Fine crystal grain.
Small crystal grains form when molten rock cools quickly. In an extrusive igneous rock, it's referred to as aphanitic texture.
If lava cools quickly, the minerals don't have as much time to form crystals, so the crystals do not become very large. Igneous rocks that cooled quickly and have small crystals are described as "aphanitic" igneous rocks.
Not enough information. Some crystals will break if they cool rapidly, some crystals will not form correctly if the solution cools too quickly.
Pumice doesn't have crystals at all, as it cools too quickly for them to form.
Small crystals are likely to form when the solution cools quickly or when there are impurities present that inhibit crystal growth. Large crystals are likely to form when the solution is allowed to cool slowly or when there is a high concentration of solute in the solution.
Large crystals with well-formed crystal faces tend to form when the mineral is given enough time to grow undisturbed in a stable environment with plenty of space and nutrients. The slower the cooling or solidification process, the larger and more well-formed the crystals can grow.
If rock cools quickly it does not have time to form large crystals and so it forms small ones. At slower cooling rates there is time to form larger crystals.
Small crystal grains form from rapid cooling of magma resulting in an aphanitic rock texture.
Pumice is made of glass. Glass forms when molten rock cools too quickly for crystals to form.
Crystals formed from slow cooling typically have larger crystal sizes due to more time for the atoms to arrange in an ordered structure. This results in minerals with well-defined crystal faces and clearer textures, as seen in intrusive igneous rocks like granite and gabbro.
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