Very fine crystals can be difficult to separate from the solution, leading to lower yields. They also tend to trap impurities within their structure, affecting the purity of the final product. Additionally, fine crystals may have a tendency to stick together, forming clumps that are challenging to work with.
A crystal of course!
It's not that only alum makes big crystals.. There are so many compounds that can make big crystals. Even Sodium Hydroxide makes very good and big crystals. For crystals you need a uniform arrangement of atoms in space. For big crystals all you need is patience. The slower is the crystallization process the bigger crystals are formed. What industries do is called seeding. They make a good concentrated solution of the compound whose crystals are needed and then they put a crystal of the same compound in the solution. The new crystals form and attach to the crystal making quick and big crystals.
iodine crystals are black, table salt crystals are white.however I doubt that was your question. I think you are referring to iodized table salt. there are no iodine crystals in iodized salt, instead they add sodium iodide to the table salt. sodium iodide crystals are indistinguishable visually from the sodium chloride crystals of table salt.the only practical way to separate sodium iodide from sodium chloride is the very tedious repetitive process of dissolving the mixed salts and performing fractional crystallization of the solution.
Obsidian is formed when lava cools very quickly, typically within a few hours, preventing crystallization. This rapid cooling prevents mineral crystals from forming, resulting in a smooth, glassy texture.
Iodine crystals are very poor conductors of heat and electricity
Very fine crystals can easily clump together, affecting the texture and consistency of a product. Additionally, fine crystals can dissolve too quickly, leading to a sudden release of flavor or sweetness that may be overpowering. Fine crystals can also cause issues with product stability and shelf life.
Big crystals are obtained by a very slow crystallization from very concentrated sugar solutions.
If a crystal is cooled quickly, there is less time for the molecules to arrange into a well-defined pattern, leading to smaller crystals or an amorphous structure. This can result in a less organized and less stable crystal lattice compared to slow cooling, which allows for better alignment of molecules and larger crystal formation.
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crystals form from molten rock as the molten rock cools. if the molten rock cools very fast then you may have small crystals growing or no crystals at all. if the molten rockk colls slowly then you then you have large crystals growing. this happens when the molten material is deep in the earth. examples of these types of crystals are Rubies, Emeralds, and Diamonds. crystals may also form when water is evaporated. salt crystals are an example as they form when salt water evaporates.
Large crystals in a mineral specimen typically form under conditions that allow for slow cooling or low rates of crystallization, allowing more time for the crystals to grow. This can happen in environments such as deep underground or in cavities where there is minimal disturbance to the crystal growth process. Large crystals are often prized by collectors for their unique beauty and rarity.
Geodes form spectacular euhedral crystals due to slow, controlled crystallization inside a cavity, which allows for well-defined crystal faces to develop. The slow growth process results in the formation of large, well-formed crystals with distinct geometric shapes.
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.
Because it doesn't absorb any visible light.
Yes, crystallization is a method of separation; a very known application is the separation of salt from sea waters.
A fine-grained igneous rock composed primarily of very small crystals of quartz is known as rhyolite. It forms from the rapid cooling of lava that is rich in silica, preventing the growth of large crystals. Rhyolite often has a light color and may contain other minerals such as feldspar and mica, but its primary characteristic is its high quartz content and fine texture. This rock is commonly found in volcanic regions and is the extrusive equivalent of granite.
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