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NOUN: “a usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors and is ...

We have the 4-letter answer for NOUN: "a usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors ...
IEEE

Silicon Doping in Amorphous Gallium Oxide Films by Plasma-Enhanced Atomic Layer Deposition for Dielectric and Optoelectronic Applications

Abstract: Gallium oxide is a representative of the fourth-generation semiconductor. The silicon doping of gallium oxide plays a crucial role in optimizing performance, with PEALD as a viable ...