Bexar County
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Limestone (building stone), Bexar County, Texas
Ellenburger Limestone (cut as for building stone) Location: listed as East of Helotes County: Bexar County Chemical Formula: CaCO3 Specimen Size: 4.75 x 3.75 x 1.5 inches Specimen Weight: 805 grams In the Jackson School Collection, at the University of Texas at Austin. Collection Reference: TMM 565
Phosphatic Sandstone, Bexar County, Texas
Location: listed as 7 miles west of San Antonio on Castroville Road on banks of Leon Creek Chemical Analysis lists samples as 3 to 18% Phosphoric Acid (see ref. below) Specimen Size: 2.25 x 2.25 x 1 inches Specimen Weight: 100 grams in the Jackson School Collection at the University of Texas at Austin. Collection Reference: TMM2732. Additional Information: Numerous references to phosphatic sandstone at this location, including: Bulletin of the University of Texas No. 365, Scientific Series No. 29, October 15, 1914, "The Mineral Resources of Texas", by William B. Phillips (available online at: https://books.google.com/books?id=ma1RAAAAMAAJ)
Aragonite, Bexar County, Texas
Locality: Bexar County, Texas Aragonite, a crystal form of Calcium Carbonate Chemical Formula: CaCO3 Crystal System: Orthorhombic Specimen Size: 5 in x 2.75 in x 1.25 in Specimen Weight: 474 grams In the Arthur E. Smith Collection, on display at Wheaton College, Wheaton, Illinois.