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: aluminum silicate, Al2SiO5 ♦ Crystal system: Triclinic ♦ Habit: columnar, forms columns ♦ Habit: Fibrous crystals ♦ Moh's hardness: 4 to 5 in one direction 6 to 7 in another direction ♦ Transparency: Transparent to translucent ♦ Luster: Vitreous to pearly ♦ Color: Blue principally, but also white, gray or green. Color is often not consistent throughout the crystal ♦ Cleavage: Good in one direction parallel to the flat blade face ♦ Fracture: Brittle ♦ Localities: Brazil, Virginia, North Carolina, Georgia, Switzerland, Russia, Serbia, India and Kenya.