Mineral name:  Celestite on limestone
Chemical formula:  SrSO4
Location:  Travis County, Texas 
Crystal system and class:  Orthorhombic  2/m2/m2/m
Genesis: These well-formed celestite crystals were precipitated from aqueous solutions on the walls of solution cavities in limestone.
Width and length of specimen in field of view in cm: 
3 x 6
Specimen number: 
E