kvartsikiteissä

Kvartsikiteissä refers to quartz crystals in Finnish. Quartz is a mineral composed of silicon and oxygen atoms arranged in a continuous framework of SiO4 silicon–oxygen tetrahedra, with two oxygen atoms for every silicon atom. It is a very common mineral in Earth's crust. The term can refer to individual, well-formed crystals of quartz, often found in geodes or as freestanding crystals in various geological settings. These crystals can exhibit a wide range of colors, including clear (rock crystal), purple (amethyst), yellow (citrine), brown (smoky quartz), and pink (rose quartz), depending on trace impurities or structural defects.

The formation of quartz crystals typically occurs in hydrothermal veins, pegmatites, and sedimentary rocks. Their geological significance is considerable, as they are used in various industrial applications, including electronics, optics, and as gemstones. The piezoelectric properties of quartz crystals, meaning they generate an electric charge in response to applied mechanical stress, are particularly important for their use in oscillators for watches and radios. Furthermore, quartz crystals have been a subject of interest in mineralogy and geology due to their abundance, variety of forms, and historical use by humans for tools and ornamentation.