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"
THE ROCK PROFESSOR
Chemistry: Calcium sodium aluminum silicate ♦ Group: Plagioclase feldspar ♦ Color: Gray to smoky black ♦ Luster: Dull to vitreous ♦ Transparency: Transparent to translucent ♦ Crystal system: Triclinic ♦ Moh's hardness: 6 - 6.5 ♦ Play of color: Labradorescence ♦ Localities: Labrador, Madagascar, and Scandinavia