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