Xyleenit

Xyleenit is a hypothetical crystalline inorganic material described in mineralogical and materials science literature. It is defined as a layered silicate-oxide with a flexible composition, typically produced in laboratory syntheses and discussed as a potential ceramic material.

Xyleenit forms plate-like crystals in the monoclinic or orthorhombic systems, with a sheet-like arrangement of silicon–oxygen tetrahedra bound to metal cations. It is typically colorless to pale green or gray, with a vitreous to resinous luster. Mohs hardness is reported around 5.5–6.5, and density near 3.0 g/cm3. The material exhibits good thermal stability and moderate chemical resistance, and can be fabricated in thin films as well as bulk ceramics.

Natural occurrence: No confirmed natural deposits have been described; xyleenit is primarily discussed as a synthetic phase observed in controlled experiments. Synthesis: Common routes include high-temperature solid-state reaction and hydrothermal synthesis from silica, alumina, and magnesia with alkali or alkaline-earth fluxes. Typical temperatures range from 500–900 C and pressures up to several kilobars, with composition adjusted by substituting Mg, Fe, or Al and by varying hydration.

Applications and research: Investigated as a dielectric material in ceramic electronics, as a refractory coating, or as a host lattice for luminescent dopants. Research is largely experimental, and no commercial-grade material is available. Safety: Fine Xyleenit powder can irritate the respiratory tract; handle with appropriate personal protective equipment. The material is stable under ambient conditions but may release oxides at high temperatures; avoid inhalation of dust.