A major constituent of granite pegmatites and the most common gangue mineral in hydrothermal and metal-bearing veins, it is easily recognizable from its characteristic hexagonal shape, usually terminated in positive or negative rhombehedrons.  The beta form of this tectosilicate forms at high temperatures, and all forms have formula SiO2.  FTP, name this common mineral, th
A major constituent of granite pegmatites and the most common gangue mineral in hydrothermal and metal-bearing veins, it is easily recognizable from its characteristic hexagonal shape, usually terminated in positive or negative rhombehedrons.  The beta form of this tectosilicate forms at high temperatures, and all forms have formula SiO2.  FTP, name this common mineral, the definition of 7 on Mohs hardness scale, and having varieties amethyst, milky, and rose.
A major constituent of granite pegmatites and the most common gangue mineral in hydrothermal and metal-bearing veins, it is easily recognizable from its characteristic hexagonal shape, usually terminated in positive or negative rhombehedrons.  
quartz