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


Fire Opal
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
hurricane names
How Are Hurricanes Named? Names are assigned as tropical storms are discovered.
Asteroid Impact Map
Asteroid Impact Map: Explore fifty of the most obvious asteroid impact craters on Earth.
Organic Gems
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
Rocks on Mars
Rocks on Mars: Many of the rocks found on Mars are not very different from Earth rocks.
Blood Diamonds
Blood Diamonds are illegally-traded diamonds that are often used to fund conflict.
Galeras Volcano
Galeras Volcano: The most active volcano in Colombia. Article by Jessica Ball.
Expansive Soil
Expansive Soil: Causes more damage than floods, hurricanes & tornadoes combined.


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
  Quartz
  Mineral Identification Chart
  Fluorescent Minerals
  Find Minerals and Gems
  Diamond
  Calcite
  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.