3. Other materials
3.1 Quartz
3.1.1 Structure and benefits of the material Positioning in relation to silicon
Single-crystal quartz (not to be confused with amorphous fused silica, often misleadingly referred to as quartz) belongs to a crystalline class characterized by one axis of symmetry of order 3, and 3 axes of symmetry of order 2, perpendicular to the first and forming 120° angles between them. It has neither a plane of symmetry nor a center of symmetry. The reference axes (X, Y, Z ) are often chosen so that X is one of the axes...
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