Element of the Day - Friday, May 28th

Who am I? I am the second most abundant element (after oxygen) in the Earth's crust. I am used in making glass and ceramics, however, I am most well known for being the principal component of most semiconductor devices, especially microchips.

E-mail me your answer at dwilliams@reading.k12.ma.us
Include the element's chemical symbol.
Image taken from: thewrangler.com