These minerals are called evaporites.
Chemical sedimentary rock.
Sedimentary
chemical
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Yes, it can be dumped out of your salt shaker. If you want to grow crystals, simply make a supersaturated solution of salt and hot water, and let it cool.
When a magma cools down, it becomes a solid. Various atoms "prefer" to be arranged in a crystallic way. So when a magma cools down, crystals start to form and grow. Crystals only grow at their edges, so to make the crystal grow larger, it would need more time to do so. Magma's that cool slower have more time for the crystals inside them to grow, so the crystals will be larger, compared to a magma that cools quicker, or even a magma that comes out of the ground (then called a lava).
Slower rates of cooling will create larger crystals. Rapid cooling allows little time for element accumulation in the crystal, therefore, the crystals created will be smaller. Larger, visible crystals in igneous rock indicate that the magma was slow cooling, usually at depth. Much smaller crystals in igneous rock indicate rapid cooling of lava, usually at or near the surface. Crystals in igneous rock will grow larger and have more time to accumulate material for their growth the more time they have at their crystallization temperature.
when rocks crysallize their are differences. on of the main differences is that the crystals in the rock grow larger than they already are. secondly there size increase from their original size.
Chemical
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crystals
It depends on the mineral and the pressure and temperature at which it forms best.
Crystals in general are formed when solutions try to maintain concentrations at or below saturation. For example, a saturated sugar solution forms crystals when water from the solution evaporates and leaves excess sugar behind. Since supersaturation is a highly unstable and thus undesirable state of being for a solution, the dissolved sugar left behind will clump together at sites of nucleation to let the remaining solution remain below supersaturation. Crystals will continue to grow as long as the concentration of solutes in the solution can increase above saturation. To grow large blue vitriol crystals, one can simply prepare a saturated solution in a large container and let it sit undisturbed for as long as possible while evaporating steadily, removing the crystals when they are a satisfactory size or before the solution dries up entirely.
Yes you can it forms purple and black crystals that form acrossed the lens like an army marching.
They would grow best in a super saturated solution. Perhaps with a "seed", and maybe the ability for the solvent to evaporate.
to make crystals grow
Sugar crystals grow best in dark areas. Some people say that putting the solution in the refrigerator is good because it is dark and cold, but actually you will want to put the crystal solution in a dark corner on your countertop, where it can get somewhat indirect rays of sunlight.
Yes crystals do grow under the ground.
Sugar crystals form from over saturated sugar in the mixture.
crystals best grow in warm temperatures.