Glittering Stones >> Crystal

Glittering Stones Crystal


A crystal is a solid Crystalin which the element atoms, molecules, or at times ions are packed in a regularly ordered, repeating pattern expanding in all three spatial dimensions.

Crystalline structures arise in all classes of materials, with all types of chemical bonds. Almost all metal exists in a polycrystalline state; amorphous or single-crystal metals should be formed synthetically, frequently with great difficulty. Ironically bonded crystals could form upon solidification of salts, either from a dissolves fluid or when it condenses from a solution. Covalently bonded crystals are also extremely common, notable examples being diamond, silica, and graphite. Polymer materials usually would form crystalline regions, but the lengths of molecules usually prevent total crystallization.

 


Historical Facts of Crystal
Crystal Density
Group I Group II Group III
< 1 g.cm-3 1 - 1.2 g.cm-3 > 1.2 g.cm-3

Mohs Scale Hardness
Diamond Sapphire Gypsum Calcite Apatite Orthoclase Boron Carbide Cubic Boron Nitride
10 9 2.5 3.5 5.5 6.5 9.5 9.9

Types Of Crystal
Covalent Crystals Metallic Crystals Ionic Crystals Molecular Crystals

Crystal System
Triclinic Monoclinic Orthorhombic Tetragonal Trigonal Hexagonal Cubic

Gem Jewelry of Crystal
Crystal ball Liquid crystal Crystal habit Corundum Ring
Crystal ball Liquid crystal Crystal habit Single crystal