Name:

sillimanite (fibrolite)

A photo of the mineral sillimanite

Class:

Silicates

Chemistry:

Al2SiO5 Aluminum Silicate

Color(s):

gray-white, brown, greenish-brown

Hardness:

6 - 7

SpecGrav:

3.2 - 3.3

Fracture:

uneven

Cleavage:

perfect one direction

Crystal:

orthorhombic -usually fibrous, columnar

Envronment:

a metamorphic mineral found in shists,

Association:

biotite, quartz, almandine

Locals:

| MA, CN, SC, USA | Germany | Austira | Italy | Brazil | S. Africa |

Misc:

Named after Benjamin Sillman, first professor of Mineralogy at Yale.

Photos
& Locals:

1.) unknown
2.) unknown

3.) unknown

TheImage Home
Minerals by Name
Minerals by Class
Gemstones

Photo Information
Crystal Info
Bibliography