Sample Number Rock Properties
Dull, brown, scaly looking, does not
seem to have luster. Many holes.
Red and speckled. Fractured looking,
grain shape is large and chunky.
4.6 Does not have much luster.
black and white/ white
5 Very Good
Has cleavage in
Chunky, has bad
Professor Eric Kelly
Field Report: October 31st, 2011
On Highway 211, 0.5 miles south of Bandera Road, in San Antonio, Texas, is a
road cut that was surveyed and studied by the students of the University of Texas at San