Crystal size in igneous rocks is generally a marker for how long magma or lava took to cool and solidify. Larger crystal size is indicative of slow cooling.
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Symmetrical crystal shapes indicate that the mineral has a well-defined crystal structure with uniform internal arrangement of atoms or molecules. This suggests that the mineral formed under conditions that allowed for ordered growth, resulting in distinct geometric shapes.
The cooling rate of the magma primarily determines the size of a mineral crystal. Faster cooling rates lead to smaller crystals, while slower cooling rates result in larger crystals. Other factors such as the mineral composition and level of nucleation can also influence crystal size.
Quartz crystals range in size from cryptocrystalline (difficulty in observing even with microscopes) to gigantic. The largest individual quartz crystal recorded weighed more than 96,000 pounds and was roughly 20 feet in length.
Overall mineral crystal size depends on how fast a solution cools. Slower cooling allows more time for mineral crystals to grow larger, while rapid cooling results in smaller crystal sizes. Additionally, the chemical composition of the solution and the presence of impurities can also influence crystal size.
It indicates that it is a metallic luster
Temperature.
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Crystal size in igneous rocks is controlled by the rate of cooling whereby the slower the rate, the larger the size of crystal.
Size of variables
A longer period of time at a mineral's crystallization temperature and pressure range, will result in increased crystal size. Rocks like granite have visible crystals because the minerals within the rock cooled very slowly underground. Rocks like obsidian have no crystals because they cooled very quickly after eruption above ground.
Symmetrical crystal shapes indicate that the mineral has a well-defined crystal structure with uniform internal arrangement of atoms or molecules. This suggests that the mineral formed under conditions that allowed for ordered growth, resulting in distinct geometric shapes.
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What is the effect of location on crystal size? Label the location of intrusive and extrusive igneous rocks on the diagram below. Then, illustrate the crystal size of the rock formed at that location in the appropriate callout circles.
By size, and geometry, by their structure in one of the six mineral crystal systems.
Primarily the cooling rate of the mineral compound.The faster the rate cooling smaller the crystal size of the mineral.Consequently, large crystal specimins are derived from igneous bodies with a very slow rate of cooling.
On average, a small crystal weighs between 2-10 grams depending on the type and size of the crystal.