Quartz APPLICATIONS: Silica for glass, electrical components, optical lenses, abrasives, gemstones, ornamental stone, building stone, etc. ASSOCIATED MINERALS: Microcline, tourmalines, wolframite, pyrite, rutile, zeolites, fluorite, calcite, gold, muscovite, topaz, beryl, hematite, spodumene. ASTROLOGICAL SIGNS: All. CHEMICAL STRUCTURE: SiO2, Silicon dioxide. CLASS: CLEAVAGE: Not present. COLOR: variable as the spectrum, but clear quartz is by far the most common color followed by white or...