Group of minerals containing one of the halogen elements (chlorine, fluorine, bromine, and iodine) as a building block. Most halides are soft and fragile, and some are soluble in water. Many crystallize in the isometric system.

Compounds containing halogens (the elements fluorine, chlorine, bromine, iodine or astatine), most usually chlorine and bromine. Within soldering, the term is usually used to refer to halogen salts (especially ammonium chloride and methyl ammonium chloride) which are activators within the flux system. Residues of these materials are corrosive, and often need to be removed if present in high concentrations. Most current fluxes are ‘halide-free’.

One of the mineral chemical groups containing halogen. Ex: rock salt, fluorite. Igneous rock: Rock formed by magma cooling to solid state. Igneous: «IHG nee uhs», rock is rock formed by the hardening and crystallization of molten material that originates deep within the earth.