The Rock Professor has provided you with a mineral
information card. Print on stock paper, and cut out
to enhance your rock and mineral products
To print: with your cursor, highlight the entire card below,
right click and select print, then click on "selection" and print.
THE ROCK PROFESSOR
Chemistry: mostly silica glass with impurities of magnesium, iron and other elements. ♦ Class: mineraloids ♦ Transparency: opaque ♦ Luster: vitreous to dull ♦