McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

Home » Minerals » Sillimanite

Sillimanite


Mineral Properties and Uses



Physical Properties of Sillimanite

Chemical Classification silicate
Color colorless, white, yellow, brown, blue, green
Streak colorless
Luster vitreous
Diaphaneity transparent to translucent
Cleavage perfect
Mohs Hardness 6.5 to 7.5
Specific Gravity 3.2 to 3.3
Diagnostic Properties slender crystals, fibrous habit
Chemical Composition Al2SiO5
Crystal System orthorhombic
Uses no significant commercial use


Sillimanite with magnetite
Sillimanite with magnetite from Benson Mines, New York. Specimen is approximately 4 inches (10 centimeters) across.


Sillimanite
Sillimanite from Williamstown, South Australia. Specimen is approximately 4 inches (10 centimeters) across.



Find it on Geology.com




More from Geology.com


Popigai Diamonds
The Largest Diamond Deposit in the world could be under Popigai Crater in Russia.
Where Do Bears Live
Where Do Bears Live in North America? Geographic range of grizzly, polar and black bears.
bear attack
Bear Attacks! Knowing how to react to a bear encounter and attack could save your life.
Novarupta
Wrong Volcano! The most powerful eruption of the 20th century was misidentified?
Largest Desert
Largest Desert: The Sahara is huge but two polar deserts are larger.
Canadian Diamonds
Canadian Diamond Mines produce some of the largest and highest quality gems!
Meteorites
Meteorites - Rocks that were once parts of planets or large asteroids.
city satellite images
What City is This? Can you recognize United States cities from satellite images?


Sillimanite
Sillimanite with magnetite from Benson Mines, New York. Specimen is approximately 4 inches (10 centimeters) across.




Sillimanite
Sillimanite from Dillon, Montana. Specimen is approximately 4 inches (10 centimeters) across.


More Minerals
  Minerals
  Rhodonite
  Fluorescent Minerals
  Quartz
  Mineral Identification Chart
  Diamond
  Find Minerals and Gems
  United States Gemstones




© 2005-2015 Geology.com. All Rights Reserved.
Images, code and content of this website are property of Geology.com. Use without permission is prohibited. Pages on this site are protected by Copyscape.