B Baringer Hill, Llano County: 21, 26 baroque pearls and/or stones: 17, 25 bediasite (tektite): 28-29, 39 beryl: 18 Big Bend National Park: 27 biotite: 23 Blanco County: 18, 22 Brazos County: 29 Brazos River: 25 Brewster County: 18, 23, 24, 25, 26, 27, 28, 31, 36 brilliancy: 5 brilliant cut, standard American: 13, 15, 16 Brown County: 19 Burleson County: 29 Burnet County: 20, 22, 23, 25, 26, 30, 37 C cabochon gems: 10-12 Caddo Lake: 25 carbuncle: 22 carnelian: 27 cassiterite: 23, 29 celestite: 19, 35 chalcedony: 27 geodes: 26 chuck: 15, 17 citrine: 25-26 cleavage: 6, 13 coal: 22 Coke County: 19 color: 5 Colorado River: 25 Concho River: 25 crown girdle facets: 16, 17 crown of gemstone: 15, 16 crystals: 7-9 crystal systems: 7 crytolite: 21 Culberson County: 22, 23, 25, 26, 31 culet: 13 cutting and polishing: 10-17 cutting lap: 13 D DeWitt County: 29 diamond: 19 saw: 10, 11 diaphaneity: 5 dispersion: 6 dopping: 12, 13 dop-stick: 12, 15, 17 dop-wax: 12, 15, 17 dravite: 30 durability: 6 Duval County: 21, 24 E El Paso County: 22, 30, 31 emerald cut: 15 epidote: 19-20 F facet, kinds of: 13 main: 16 skill: 16 table: 13, 14 faceted gems and/or stones: 10, 13-17 Fayette County: 20, 29 fergusonite: 21 fire: 5 Fisher County: 19 fluorite: 20, 21 Foard County: 19 fossil wood: 20-21, 22 fracture: 6 Franklin Mountains: 18 G gadolinite: 21-22 garnet: 20, 22, 36 gemstones, by kinds: 18-31 geodes, celestite: 19 Georgia: 29 Gillespie County: 18, 22, 23, 25, 26, 30, 36 girdle facets: 16 gneiss: 22 Gonzales County: 20, 29 grain: 25 gram: 7 graphite: 30 Grimes County: 29 grinding: 12 Guadalupe River: 25 Gulf Coast: 25 Gulf Coastal Plain: 18, 20, 22, 35 H hardness: 6 Hudspeth County: 18, 20, 22, 24, 25, 26, 27, 28, 31 I index of refraction: 5 J jasper: 27-28 Jeff Davis County: 26, 27, 28, 31 jet: 22 K Kinney County: 28 L labradorite: 23, 36 Lake Buchanan: 21 Lampasas County: 19 lap plate: 13 Lavaca County: 29 Lee County: 20, 29 lignite: 22 Live Oak County: 21 Llano County: 18, 19, 20, 21, 22, 23, 25, 26, 30, 31, 40 Llano River: 25 luster: 5 M Madeira topaz: 29 Mason County: 20, 22, 23, 26, 29, 30, 39, 40 Massachusetts: 29 Maverick County: 18 microcline: 20, 21, 23-24, 29, 37 Mohs scale of hardness: 6 moonstone: 28 Mount Bonnell: 19 muscovite: 23