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Williamsite (a variety of Antigorite)
Current inventory:  0 gems
 

Williamsite

  
Williamsite was named in 1848 by Charles Upham Shepard in honor of its discoverer, Lewis White Williams (1804-1873), a mineralogist and geologist of West Chester, Chester County, Pennsylvania.

Discovered about 1848; IMA status: Not Valid (variety name)

 

Chemistry

 

 

Chemical Formula:

Mg3(Si2O5)(OH)4 + Cr

 

Magnesium Silicate Hydroxide + Chromium

 

 

More Information

   

   

 

Williamsite is a variety of Antigorite.
For more information please see the
Antigorite information page.
 

Synonyms:

Chrome Antigorite

Type Locality:

State Line Chrome Mine which lies just inside Lancaster County, Pennsylvania 

Year Discovered:

about 1848

View mineral photos:

Williamsite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org (Williamsite)
Mindat.org (Antigorite)
Webmineral.com (Antigorite)

 

 


Williamsite
is a very translucent, medium to deep, apple green, variety of Antigorite that gets its color from the presence of chromium (Cr). It often contains dark octahedral crystals of Chromite in it. Williamsite originally came from the historic State Line Chrome Mine which lies just inside Lancaster County, Pennsylvania on the Pennsylvania-Maryland border. Williamsite was named by Charles Upham Shepard in 1848 in honor of its discoverer, Lewis White Williams (1804-1873), a mineralogist and geologist of West Chester, Chester County, Pennsylvania.

Williamsite originally came from the historic State Line Chrome Mine which lies just inside Lancaster County, Pennsylvania on the Pennsylvania-Maryland border. This mine was active from the 1800's into the early 1900's. Williamsite has also been found at Wood's Chrome Mine, Texas, Little Britain Township, Lancaster County, Pennsylvania, USA. However, as of Summer 2012, the property and mine is closed to collectors.
 

  
Williamsite gems for sale:

We have not photographed our Williamsite gems. Please check back soon.
 

 


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