Dissertation is prodromus

Steno’s Prodromus ’laid the foundations of the science of crystallography. He reported that, although quartz crystals differ greatly in physical appearance, they all have the same angles between corresponding faces.’ 15 Similarly, each type of crystal of a chemical or mineral has its own characteristic angles (see Figure 2). The simplest crystal shape is a cube, which has six equal square faces all at right angles, . common salt (sodium chloride). Quartz, beryl (. emerald) and corundum (. sapphire, ruby) are often found as hexagonal crystals with 120 o between faces, and so on. This rule about the characteristic interfacial angles for each type of crystal is known as Steno’s Law. It holds true for any two crystals of the same substance ‘regardless of size, locality of occurrence, or whether they are natural or man–made’. 15

Dissertation is prodromus

dissertation is prodromus

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