Illustrations
Figures— Page [1. Typical crystal form of three common Texas gemstones] 9 [2. Variations of the cabochon cut] 10 [3. Diamond saw] 11 [4. Cabochon properly attached to dop-stick] 12 [5. Cabochons at various stages of cutting and polishing] 12 [6. Nomenclature of the standard American brilliant cut] 13 [7. Facet table] 14 [8. Grinding the table facet on a rough stone] 15 [9. Stone dopped to table facet] 15 [10. Preformed stone dopped to table facet] 16 [11. Proper sequence of cutting of the pavilion facets] 16 [12. Proper placing of pavilion girdle facets] 17 [13. Proper sequence of cutting of crown facets] 17 [14. Common crystal form of Travis County celestite] 19 [15. Common crystal form of fluorite] 20 [16. Crystal faces on microcline specimen shown in Plate III] 23 [17. Common crystal form of spinel] 28 [18. Crystal faces on topaz crystal shown in Plate V] 29 [19. Cross section through irregularly colored stone] 30 [20. Common crystal form of Llano County tourmaline] 31
Plates— Page [I. A, Gem-quality celestite crystals from Travis County. B, Opalized wood from the Texas Gulf Coastal Plain] 35 [II. A, Gem-quality garnet crystals and faceted gem from Gillespie County. B, Labradorite from Brewster County] 36 [III. A, Pink microcline crystal. B, Smoky quartz. Both from Burnet County] 37 [IV. Polished agate from gravels of the Rio Grande near Zapata, Zapata County] 38 [V. A, Texas tektites (bediasites). B, Topaz crystal from a pegmatite dike near Streeter, Mason County] 39 [VI. A, Topaz from stream gravels near Streeter, Mason County. B, Tourmaline crystals in schist from Llano County] 40