Mason County
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Fluorite (or Fluorspar) is a Calcium Fluoride Locality: Mason County, Texas, noted as found in the "Fredonia area" Chemical Formula: CaF2 Crystal System: Isometric Specimen size: 1.5 in x 1.5 in x 1.5 in Specimen weight: 33 grams On display in the Arthur E. Smith Collection, Wheaton College, Wheaton, Illinois.
Topaz Mason County, Texas Chemical Formula: Al2(SiO4)(F,OH)2 Crystal System: Orthorhombic (short to long prismatic crystals) Specimen Dimensions: 4 cm x 4 cm x 4 cm Specimen Weight: 206 grams Specimen ID: B-1336 Topaz is the state gem of Texas. This specimen circled the earth on one of NASA's space shuttles. From the Colonel E.M. Barron Mineral Collection
Topaz (river worn), Mason County, Texas
Topaz, typical rounded specimens collected in Mason County, Texas Chemical forumula: Al2SiO4F Crystal System: Orthorhombic Specimen weight: 8 grams (total, all 4 crystals) Specimen size: Top left (brown crystal) long dimension = 15 mm, bottom right (yellow crystal) long dimension = 13 mm From the Middleton Collection (AGMS member).