Tourmaline (Schorl) in Packsaddle Schist, Burnet County, Texas
Schorl, the Sodium Iron end member of tourmaline group
Locality: Town Mountain, Burnet County, Texas
Chemical Formula: (Ca,K,Na)(Al,Fe,Li,Mg,Mn)3(Al,Cr,Fe,V)6
Crystal System: Trigonal
Specimen size: 4.5 in x 3 in 2.5 in
Specimen weight: 405 grams
In the Arthur E. Smith Collection, on display at Wheaton College, Wheaton, Illinois.