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Crystals
Crystals
The name of frozen water crystals is ice.
All rocks have crystals, or at least crystalline structures. Sedimentary rocks may not have crystals as such, but the individual grains have internal crystal structures. All magmatic and metamorphic rocks have crystals, though they may be too small to be seen without the aid of a microscope. Only possible exception is Obsidian (volcanic glass) which may be amorphous.
The form of sugar found in grains is a compound one called sucrose.
Crystals
Crystals
Crystals
Crystals
Zincblende is an alternative name for sphalerite, a mineral containing cubic crystals.
Crystals
The name of frozen water crystals is ice.
All rocks have crystals, or at least crystalline structures. Sedimentary rocks may not have crystals as such, but the individual grains have internal crystal structures. All magmatic and metamorphic rocks have crystals, though they may be too small to be seen without the aid of a microscope. Only possible exception is Obsidian (volcanic glass) which may be amorphous.
Sand consists mainly of silicon dioxide, and this has a great propensity to crystallize. Sufficiently so, that in extreme circumstances actual cm-sized crystals made of sand grains are known. Sand crystals by name. In any event, because of its propensity to crystallize, SiO2 grains aggregate to form a coherent whole. This is accelerated if the sand body is subject to heat, or if it is immersed, thus making chemical bonds more easy.
engage, interlink, accord, coincide, chain, link, interconnect
de-watered crystals
Sandstone, as its name implies, is composed of many small grains of sand loosely held together. You may be able to rub some off with your hand. The grains will be small and there will be spaces between the grains. Granite on the other hand is formed from the melt underground, and has crystallized there. The crystals will be larger - up to cm size - and firmly bound. [Except if the granite is badly weathered.]