A B C D E F G H I J K L M N O P Q R S T U V W X Y Z - A
- acid: 18, 22
- acid tests (see also chemical tests): 18
- actinolite: 82
- schist: 87
- agate: 21, 83
- agatized wood: 20, 84
- age, earth’s crust: 2
- alabaster: 65
- albite: 55
- alkali lakes: 66, 83
- Allamoore: 87, 93
- alloys: 52
- almandite: 58
- Alpine: 57, 78, 82, 90
- Altuda Mountain: 57, 90
- amalgam: 51
- amazonstone: 56
- amethyst: 37, 82
- Amethyst Hill: 82
- amorphous minerals, definition of: 15
- amphibole asbestos: 29, 33, 34, 44
- Anderson County: 70
- Andrews County: 83
- Angelina County: 52
- anhydrite: 28, 29, 30, 35, 36, 43, 65, 66, 91
- anthophyllite: 93
- antigorite: 87
- Apache Mountains: 65
- apatite: 72
- Archer County: 52
- argentite: 26, 27, 89, 90
- argentiferous galena: 57, 90
- Armstrong County: 79
- asbestos: 43
- amphibole: 29, 33, 34, 44
- chrysotile: 44, 87
- ash, volcanic: 41, 97
- augite: 45
- Austin: 46, 62
- autunite: 97
- azurite: 35, 52, 53, 54
- B
- Babyhead: 72
- Balcones fault zone: 10, 42, 45, 88
- Bandera County: 45
- Baringer Hill pegmatite: 80
- barite: 15, 28, 31, 32, 35, 36, 38, 44, 48
- barium: 45
- Barrilla Mountains: 85
- Baylor County: 45, 52, 98
- basal cleavage: 76, 93, 94
- basalt: 40, 41, 45
- basement: 2, 9
- Bastrop County: 64
- Bell County: 69
- bentonite: 51, 52
- beryllium: 80
- Big Bend area: 9, 42, 51, 75, 77
- Big Branch Gneiss: 59
- biotite: 32, 33, 34, 76
- Bird mine: 90
- Blanco County: 44, 58, 59, 61, 70, 83, 87, 94
- black mica (see biotite)
- blast furnace: 70, 71
- blast sand: 86
- bleaching clay: 51
- blue copper: 53
- Boerne: 18
- Boling salt dome: 91
- books about rocks and minerals: 24, 39, 100
- brass: 52
- braunite: 26, 27, 73
- Brazoria County: 91
- Brazos County: 98
- Brazos River, Double Mountain Fork and Salt Fork of: 43
- breccia: 12, 41, 81
- Brewster County: 45, 46, 47, 49, 50, 57, 65, 70, 76, 77, 78, 82, 84, 85, 90
- brimstone: 90
- bronze: 52
- Brooks County: 64
- Brown, Thomas E.: vii
- Brown County: 45, 49
- brown iron ore (see also limonite): 70
- Bryan Mound salt dome: 91
- building sand: 85
- Burnet: 56, 80, 97
- Burnet County: 18, 53, 54, 55, 56, 58, 59, 60, 61, 62, 63, 70, 76, 79, 80, 81, 82, 83, 97
- C
- calcareous sinter and tufa: 46
- calcite: 7, 14, 18, 19, 20, 21, 28, 30, 31, 32, 34, 35, 36, 38, 45, 46, 49, 50, 51, 54, 56, 64, 68, 75, 86, 87, 88, 91
- dog-tooth spar: 46, 47
- Caldwell County: 88
- caliche: 46, 47
- Cambrian: 2, 3, 55, 58, 69, 86
- Cameron County: 66
- Capitan reef limestone: 1
- Capitol building, Texas St
st Texas: 70
- Ector County: 79
- Edwards Limestone: 68, 69, 84
- effervescence in acid: 18
- El Capitan Peak: 1
- elements: 7, 8, 95, 96
- Ellenburger strata: 55, 84
- El Paso: 48, 58, 85, 88
- El Paso County: 48, 58, 62
- epoch: 2
- era: 2
- erosion: 11
- extrusive igneous rocks, definition of: 9
- 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, 63, 64
- satin spar: 64
- selenite: 63, 64, 76
/dt> 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, 78
- Presidio County: 45, 49, 57, 60, 62, 67, 77, 78, 84, 85, 90, 97
- Presidio mine: 60, 90
- properties of minerals: 14
- pseudomorphs: 70, 87
- pulverulent limestone: 41, 69
- pumicite: 97, 98
- pyramidal cleavage: 74
- pyrite: 19, 26, 60, 70, 80, 87
- pyrolusite: 27, 73, 74
- pyroxene: 45
- Q
- quartz: 8, 20, 29, 30, 31, 33, 36, 37, 38, 48, 51, 54, 56, 59, 60, 61, 68, 72, 78, 79, 80, 81, 84, 85, 86, 94
- agate: 21, 83, 84
- amethyst: 37, 82
- chalcedony: 16, 21, 45, 78, 81, 83, 86
- chert: 19, 40, 97
- U
- Upshur County: 70
- uranium: 80, 95, 96
- minerals: 95
- uraninite: 97
- uranophane: 31, 95, 97
- Uvalde County: 45, 60, 84, 88
- V
- Valley Spring Gneiss: 59
- Val Verde County: 45, 74, 75
- Van Horn area: 42, 52, 53, 58, 59, 60, 75, 76, 79, 85, 87, 90
- Van Horn Mountains: 45, 55, 76, 79, 95
- Van Zandt County: 66
- verde antique: 88
- vesicles: 45
- vitrophyre: 40, 77
- volcanic ash: 41, 97
- volcanic igneous rocks, definition of: 9
- volcanoes: 9, 97, 98
- W
- Waco: 88
- wad: 73, 74
- Walker County: 52
- Ward County: 66
- Washington County: 78, 84
- weathering: 11
- Webb County: 11, 84
- Weches strata: 70
- Wharton County: 91
- white mica (see muscovite)
- Wilbarger County: 98
- Willacy County: 66
- Williamson County: 20, 60, 69, 70, 88
- Willow City: 94
- wood opal: 78
- wood, petrified: 20, 52,
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