Quartz
The most common mineral – the chemical compound is quartz - a compound of silicon with oxygen in the most common form known as ordinary sand with a very simple chemical formula – SiO2. It is obvious, if we include, that oxygen and silicon …
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Crystals and their structure
Crystals and their structure.
Already in antiquity it was noticed, that a common mineral called quartz can exist in the form of polyhedrons bounded by flat faces. These polyhedra constantly have the shape of a hexagonal column ended with the walls of the pyramids. Although the individual geometric forms of quartz differ in appearance, constant …