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crystals

A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification.
The word crystal derives from the Ancient Greek word κρύσταλλος (krustallos), meaning both "ice" and "rock crystal", from κρύος (kruos), "icy cold, frost".Examples of large crystals include snowflakes, diamonds, and table salt. Most inorganic solids are not crystals but polycrystals, i.e. many microscopic crystals fused together into a single solid. Examples of polycrystals include most metals, rocks, ceramics, and ice. A third category of solids is amorphous solids, where the atoms have no periodic structure whatsoever. Examples of amorphous solids include glass, wax, and many plastics.
Despite the name, lead crystal, crystal glass, and related products are not crystals, but rather types of glass, i.e. amorphous solids.
Crystals are often used in pseudoscientific practices such as crystal therapy, and, along with gemstones, are sometimes associated with spellwork in Wiccan beliefs and related religious movements.

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  1. M

    white crystals in filter not limescale

    I have repeatedly low water pressure from my taps and shower - but only on my first floor - due to having filters blocked by some substance that is not sediment or limescale. The crystals are easily crushed and slightly waxy,slimey. I had their chemistry analysed at work. It is not sediment...
  2. E

    Green crystals coming out all the hot taps in the house? help please

    Hello, the house was refurbished over a year ago and now we have Green crystals coming out all the hot taps in the house? The water board say it's not limescale These green crystal like pieces are coming out of all the hot water taps and showers: we collect them from the tap filers: there are...
    • Els
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    • america coming crystals green help hot house please taps usa water mains
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  3. B

    Combimate leaking after replacing crystals

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  4. W

    "Captain Dilithium crystals are barely holding out!!"

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  5. D

    Does sentinel x800 need neutralising crystals ?

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  6. N

    Changing combi mate crystals?

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