Quartzite
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Quartzite is a hard, non-foliated metamorphic rock that was originally pure quartz sandstone. Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression
Quartzite, containing darker bands of phengite and chlorite, from Maurienne Valley in the French Alps
Quartzite can have a grainy, glassy, sandpaper-like surface
Abandoned quartzite mine in Kakwa Provincial Park, British Columbia, Canada
Quartzite statue of an Egyptian Pharaoh, 14th century BCE
Silicon
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Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent non-metal and semiconductor. It is
Quartzite
…stone tools. It is presently used for decorative dimension stone, as crushed stone in highway construction, and as a source of silica for production of silicon and silicon compounds. Quartzite is a very hard rock composed predominantly of an interlocking mosaic of quartz crystals. The grainy, sandpaper-like…
Silicon Croda
Jöns Jacob Berzelius discovered silicon in 1823.
Single crystal of silicon grown by the Czochralski process used to make integrated circuits
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