* DEP Home * About DEP * Programs * Contact * Site Map * Search *
Images
Florida Geological Survey - Geologic Topics
arrow pointing left Back to Rocks and Mineral

Mineral

Staurolite

FGS logo

Identification:Staurolite is a complex iron, aluminum silicate, Fe2Al9Si4O22(OH)2. It is usually some shade of brown, has a colorless streak, a specific gravity that ranges from 3.4 to 3.8 and a hardness of 7.0 to 7.5. Staurolite resembles rutile under the microscope, but has a dull luster.  In Florida, staurolite occurs as rounded sand-size particles.
Occurrence: Staurolite is one of the most abundant minerals in Florida's heavy sand deposits.
Use: The principal use of staurolite is in the production of Portland cement, where it substitutes for clay in supplying the necessary alumina and part of the iron as required by the cement formula. Staurolite is also used as a sand blasting material.

Staurolite

Last updated: July 01, 2015

  3000 Commonwealth Blvd., Suite 1   Tallahassee, Florida 32303   850-617-0300 (phone)  850-617-0341 (fax)
Contact Us 
DEP Home | About DEP  | Contact Us | Search |  Site Map