F Fairland: [54] Falfurrias: [64] Fannett salt dome: [91] Fayette County: [52], [64], [84], [98] feldspar: [8], [29], [30], [31], [33], [34], [35], [37], [45], [51], [55], [59], [61], [72], [79], [80], [85], [86] albite: [55] amazonstone: [56] microline: [55], [56], [61] orthoclase: [55], [61] fibrous gypsum: [64], [65] filtering sand: [86] Fisher County: [20], [49], [58], [65] Flawn, Peter T.: [vii] flint: [84] flowstone: [18] flow structure: [85] [fluorite]: [29], [32], [34], [35], [37], [38], [56], [72] Foard County: [52], [58] foliation: [87] fool’s gold: [53], [80] formation: [6] Fort Bend County: [91] Fort Worth: [88] fracture of minerals: [17] fragmental rocks: [12] Franklin Mountains: [48], [58], [62], [85] Frasch method of sulfur mining: [91], [92] Fredonia: [67] Freer: [78], [83] furnace (see [blast furnace]; [open-hearth furnace])
G gabbro: [87] gneiss: [59] Gaines County: [83] galena: [17], [26], [57], [89], [90] argentiferous: [57], [90] Galveston County: [91] Gamble prospect: [67] gamma rays: [96] garnet: [31], [33], [34], [37], [58], [85], [87] Garza County: [97] Geiger counter: [96] gemstones: [56], [58], [77], [82], [94], [95] geode: [19], [46], [49], [82] geologic map: [4], 5 geologic time scale: [2], [3] geologists: [2] geology: [2] Gillespie County: [44], [45], [55], [58], [59], [60], [61], [65], [76], [80], [82], [83], [87], [88], [94] glass, natural: [9], [77], [85], [97] glass sand: [85]-86 glauconite: [70], [73] glossary: [102]-103 gneiss: [13], [41], [55], [56], [59], [67], [72], [73], [74], [76], [81], [87], [93], [97] conglomerate: [59] gabbro: [59] granite: [59] hornblende: [59] mica: [59] goethite: [70] gold: [26], [51], [59], [80], [90] fool’s: [53], [80] Gonzales County: [52], [84], [97] Grand Saline salt dome: [66] granite: [2], [8], [9], [13], [41], [48], [55], [56], [59], [61], [72], [76], [79], [81], [85], [87], [94], [95] gneiss: [59] opaline: [72] Granite Mountain: [62] Granite Shoals Lake: [56] granules: [85] graphite: [26], [27], [62], [75] schist: [63], [87] gravel: [12], [41], [91] green copper carbonate: [53] greensands: [70] Grit: [94] grossularite: [58] group: [6] Guadalupe Mountains, Peak: [1] Gulf Coast: [91] Gulf Coastal Plain: [20], [42], [43], [46], [51], [52], [58], [60], [65], [66], [78], [83], [84], [86], [87], [92], [97], [98] Gulf salt dome: [91] Gyp Hill salt dome: [64] gypsite: [65] gypsum: [28], [29], [30], [32], [36], [37], [43], [63], [70], [85], [91] alabaster: [65] fibrous gypsum: [64], [65] rock gypsum: [40], [65] rosettes: [63], [64] satin spar: [64] selenite: [63], [64], [76]
H [halite]: [28], [32], [34], [35], [36], [38], [40], [43], [65], [91] hand lens: [22] Hardeman County: [52], [58], [64], [65] hardness of minerals: [16], [99] Harris, Bill M.: [vii] Harris, John S.: [vii] Harris County: [65], [66] Hartley County: [79] Hays County: [45] Hazel Formation: [52] Hazel mine: [52], [53], [90] Heath mine: [60] hematite: [26], [27], [36], [66], [75], [84], [86] specular: [67] Henderson County: [70] High Island salt dome: [91] High Plains: [42], [46], [51], [65], [66], [78], [79], [83], [87], [97], [98] Hockley salt dome: [65], [66] hollandite: [26], [27], [28], [73], [74] Honey Creek area: [87] hornblende: [8], [59], [61] gneiss: [59] schist: [87] horn silver: [90] Hoskins Mound salt dome: [91] Houston: [70] Howard County: [45], [60] Hudspeth County: [45], [52], [53], [55], [56], [57], [58], [59], [60], [62], [65], [66], [67], [75], [79], [82], [83], [90], [93], [95] Humphreys, Alan: [vii] Hutchinson County: [66] hyalite: [78] hydrochloric acid (see also [chemical tests]): [18], [22]
I identification charts: [24] igneous rocks, definition of: [9] intrusive igneous rocks, definition of: [9] Irion County: [60] iron: [59], [66], [67], [69], [70], [72], [73] Iron Mountain: [73]
J Jackson strata: [97] jasper: [81], [84] Jasper County: [52] Jeff Davis County: [45], [51], [74], [78], [85] Jefferson County: [91] Johnson County: [69]
K kaolin: [51] kaolinite: [51] karats: [60] Karnes County: [97], [98] Katemcy: [94] Kendall County: [18] Kenedy County: [66] Kent County: [98] kidney ore: [67] King, Elbert A., Jr.: [vii] King County: [52] Kinney County: [45] Kleberg County: [66] Knox County: [52]
L labeling rock and mineral specimens: [23] labradorite: [45] Lake Buchanan: [80], [83] Lamb County: [79] Lampasas County: [20], [48], [49], [88] lava: [9] lead: [57], [90] Leakey: [51] Lee County: [64], [84] lens: [22] Liberty County: [91] lime: [69] limestone: [12], [13], [18], [19], [40], [43], [45], [46], [49], [54], [55], [56], [57], [58], [60], [68], [74], [75], [76], [84], [88], [90], [91] chalk: [69] dolomitic: [68] lithographic: [69] öolitic: [69] pulverulent: [41], [69] [limonite]: [19], [27], [28], [30], [32], [70], [75], [81], [86] lithographic limestone: [69] Live Oak County: [45], [97] llanite: [41], [71], [81] Llano: [60], [63], [72], [73], [95] Llano County: [44], [45], [55], [56], [58], [59], [60], [61], [63], [70], [71], [72], [73], [76], [78], [80], [83], [87], [88], [94], [95] Llano uplift: [10], [18], [42], [44], [52], [55], [56], [58], [59], [60], [61], [62], [63], [67], [70], [72], [76], [77], [79], [80], [82], [83], [84], [85], [86], [87], [88], [93], [94], [95] Lone Grove: [63] Lone Star: [70] Longhorn Cavern: [18] Long Point salt dome: [91] Lonsdale, John T.: [vii] luster of minerals: [16] Lytton Springs oil field: [88]
M Macon, James W.: [vii] magma: [9] magnesium, source of: [55] magnetite: [28], [67], [70], [72], [85], [87], [93] malachite: [34], [52], [53], [54] Malone Mountains: [65] manganese: [73], [75] map— geologic: [4]-5 physiographic outline: [42] Marathon area: [42], [84], [88] marble: [13], [14], [40], [46], [54], [75] Marble Falls: [62] Marion County: [70] martite: [67] Mason: [74] Mason County: [48], [55], [58], [59], [60], [61], [67], [72], [73], [74], [76], [80], [83], [94] masses, crystalline, definition of: [14] Matagorda County: [91] Mayfield prospect: [74] McCulloch County: [88] Medina County: [45] Menard County: [65] [mercury]: [8], [49], [50], [51] metamorphic rocks, definition of: [12] metamorphism, definition of: [13], [14] mica (see also [biotite]; [muscovite]): [8], [60], [61], [63], [64], [72], [76], [79], [80], [85], [87] mica gneiss and/or schist: [59], [76], [87] Mica Mine area: [58], [76], [77], [79] microcline: [55], [56], [61] milky quartz: [82] Mills County: [49] mineral identification charts: [24] mineralogists: [2] minerals, definition of: [7], [14], [15] Mississippian: [3], [55], [69], [88] Mitchell County: [66] Mohs scale of hardness: [16], [17] molybdenite: [63] montmorillonite: [51] Morris County: [70] moss agate: [84] Moss Bluff salt dome: [91] muriatic acid: [22] [muscovite]: [31], [32], [34], [37], [38], [76]
N Nacogdoches County: [70] Nash salt dome: [91] native elements: [8] native mercury: [8] native silver: [26], [89] nodule: [19], [44], [49] Nolan County: [20], [49], [63], [64], [65] north-central Texas: [43], [51], [52], [69], [70], [86], [88]
O Oakville strata: [97] obsidian: [40], [77] occurrence of minerals: [14] ocher, red: [67] octahedral cleavage: [56], [57] oil shale: [88] olivine: [88] onyx: [84] öolitic limestone: [69] opal: [21], [29], [30], [31], [35], [37], [38], [78], [86] opaline granite: [72] opalized wood: [20], [78], [84] [open-hearth furnace]: [70], [72] Orchard salt dome: [91] Ordovician: [3], [55], [69], [84] orthoclase: [55], [61]