UT Permanent Collection - murphotos

Gadolinite (Y), a Berylium Yttrium Rare Earth, Llano County, Texas

Locality: Llano County, Texas (Baringer Hill)
Chemical Formula: Y2FeBe2Si2O10
Crystal System: Monoclinic
Specimen size: 3 x 3.25 x 2 inches
Specimen weight: 742 grams
In the Jackson School of Geosciences Collection, University of Texas at Austin.
Collection reference: TMM 1875.

Additional Information: Baringer Hill is the site of a pegmatite, discovered in 1887 by John Baringer, and has been described by the USGS as one of the greatest deposits of rare-earth elements in the world. Unfortunately, the site is now covered by the waters of Lake Buchanon. So this sample is rare, and even though it doesn't display the crystal forms found in Norway and Italy, it does display the characteristic glassy vitreous nature and brittleness and conchoidal fractures that are common in specimens.

201509303 inches x 3.25 inches x 2 inches742 gramsBaringer Hill PegmatiteJackson School CollectionLlano CountyUniversity of Texas at Austincollection reference TMM 1875rare earthGadoliniteTexasY2FeBe2Si2O10