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 State: 62
cap-rock: 91, 92
carats: 60
carbon: 62, 63
carbonized wood: 20
carnotite: 30, 95, 97
Carrizo Mountains: 67, 83, 95
Casey, Miss Josephine: vii
Cass County: 70
cassiterite: 27, 32, 47
Castile Gypsum: 91
Catahoula strata: 78, 86, 97
cave deposits: 18
caves: 18, 19, 49
Caverns of Sonora: 19
Cedar Lake: 83
Cedar Park: 70
celestite: 20, 28, 30, 35, 38, 48
cementing materials: 12, 46, 67, 70, 86
cerargyrite: 28, 29, 34, 37, 89, 90
cerium: 80
chalcedony (_see also_ agate): 16, 21, 45, 78, 81, 83, 86
chalcocite: 21, 26, 27, 52, 54, 73, 89
chalcopyrite: 26, 52, 53, 54, 60
chalk: 40, _69_
chemical elements: 7
chemical sediments: 12
chemical tests: 18, 43, 46, 47, 49, 52, 53, 54, 64, 68, 75
Cherokee County: 70
chert: 19, 40, 81, 84
chessylite: 53
china clay: 51
Chinati Mountains: 45, 57, 62, 85
Chisos Mountains: 45, 62, 85
chlorite: 93
schist: 87
chrysotile: 44, 87, 88
asbestos: 44, 87
cinnabar: 36, 49
clastic rocks: 12
clay: 40, 45, 49, 51, 70, 86, 88, 91
bentonite: 45, 51, 52
bleaching clay: 51
china clay: 51
kaolin: 51
clay minerals: 51
Clay County: 52
Clear Creek area: 63
cleavage: 17
basal: 76, 93, 94
cubic: 17, 57, 65
octahedral: 56, 57
pyramidal: 74
rhombohedral: 46, 54
Clemens salt dome: 91
Coal Creek serpentine: 87, 88
Coke County: 20, 49
Coleman County: 86
color of minerals: 16
columns: 18
Comal County; 45, 69
Comanche County: 49
common opal: 78
composition of minerals: 99
concretions: 19
conglomerate: 11, 12, 41, 55, 81
gneiss: 59
contact metamorphism: 13
copper: 52, 59, 90
blue copper: 53
glance: 52
green copper carbonate: 53
minerals: 52
pyrites: 53
yellow copper ore: 53
coquina: 41, 69
Crane County: 66
Cretaceous: 2, 3, 20, 21, 45, 46, 49, 51, 55, 57, 60, 65, 68, 69,
70, 74, 75, 84, 86, 88
cryptocrystalline quartz: 81, 84
crystal, definition of: 14
crystals, twinned: 46, 63
crystalline minerals, definition of: 14
Crosby County: 79
crust, earth’s: 2
cubic cleavage: 17, 57, 65
Culberson County: 1, 45, 52, 53, 58, 59, 60, 65, 75, 79, 83, 90,
91, 95
D
Daingerfield: 70
Dallas: 88
Damon Mound salt dome: 91
daughter elements: 95, 96
Davis Mountains: 45, 85, 98
Delaware Mountains: 65
diamond: 62
diatomaceous earth: 78
diatomite: 40, 78
Dickens County: 79, 98
Dietrich, John W.: vii
dikes: 72, 79
dog-tooth spar: 46, 47
dolomite: 29, 30, 32, 36, 38, 40, 43, 54, 68, 75, 87, 88
dolomitic limestone: 68
Double Mountain Fork of the Brazos River: 43
double refraction: 46
dravite: 95
Duval County: 78, 83, 91, 97
dynamic metamorphism: 14
E
Eagle Flat: 93
Eagle Mountains: 56, 57, 90, 95
earth’s crust: 2
east 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, 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
P
Packsaddle Mountain: 87
Packsaddle Schist: 87
Palangana salt dome: 91, 97
paleontologists: 2
parting of minerals: 17
Pavitte prospect: 53
Pecos County: 9
Pecos River: 65, 74, 75
pegmatite: 41, 55, 56, 58, 76, 77, 79, 81, 94, 95
Baringer Hill: 80
Pennsylvanian: 3, 45, 51, 55, 69, 70, 86, 88
peridotite: 88
period: 2
Permian: 1, 3, 20, 21, 43, 45, 49, 52, 55, 64, 65, 69, 86, 90
Permian basin: 42, 43, 65, 66
petrified wood: 20, 52, 78, 84
petrologists: 2
phenocrysts: 85
physiographic outline map: 42
pitchblende: 28, 95, 97
placer deposits: 60
Plata Verde mine: 90
Polk County: 98
porphyritic rocks: 45, 85
portland cement: 51, 69, 88
Precambrian: 2, 3, 44, 45, 48, 52, 53, 56, 58, 59, 60, 61, 63, 67,
72, 74, 75, 76, 79, 82, 85, 87, 93, 94, 95, 97
precious opal: 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, 81, 84
cryptocrystalline: 81, 84
jasper: 81, 84
milky: 82
onyx: 84
rock crystal: 82
rose: 82, 83
smoky: 82, 83
quartzite: 41, 74, 84, 86
Quaternary: 2, 3, 51, 79, 98
quicksilver (_see also_ mercury): 50
Quitman Mountains: 57, 58, 60, 62, 67, 82, 90
R
radioactivity: 95, 96
Real County: 49, 51
Recent: 2, 3
“red beds”: 52
red ocher: 67
reef limestone: 1, 12
Reeves County: 65, 85, 91
reference books: 24, 39, 100
refraction, double: 46
rhombohedral cleavage: 46, 54
rhyolite: 40, 85
porphyry: 41, 85
Rio Grande: 83, 84, 97
rock—
crystal: 82
gypsum: 40, 65
identification charts: 39
salt: 40, 65
units: 2
rocks, definition of: 8
Rodda, Peter U.: vii
rose quartz: 82, 83
rosettes: 63, 64
Rustler Springs area: 91
rutile: 82
S
salt (_see also_ halite): 40, 65, 66
domes: 43, 58, 64, 66, 91, 97
lakes: 66
rock: 40, 65
Salt Fork of the Brazos River: 43
sand: 41, 58, 72, 85, 91
blast: 86
building: 85
filtering: 86
glass: 85-86
sandstone: 41, 52, 55, 58, 59, 72, 76, 81, 84, 86
Sandy Creek: 60
San Saba County: 70, 88
Santa Anna: 86
satin spar: 64
Satorsky, Cyril: vii
scale, geologic time: 2, 3
scintillation counter: 96
schist: 41, 56, 58, 72, 73, 76, 81, 87, 93
actinolite: 87
graphite: 63, 87
hornblende: 87
mica: 76, 87
talc: 87, 93
schistosity: 87
schorl: 95
Scurry County: 98
sedimentary rocks, definition of: 10
sediments: 8, 11
chemical: 12
selenite gypsum: 63, 64, 76
series: 2
serpentine: 34, 40, 44, 75, 87, 93
serpentinite: 87
Seven Heart Gap: 45
Shafter: 57, 58, 60, 67, 90
Shafter Lake: 83
shale: 12, 13, 19, 40, 45, 70, 87, 88
oil: 88
Shelby, Cader A.: vii
Sheridan prospect: 53
siderite: 70
Sierra Blanca: 58, 67, 82
silicified wood (_see also_ petrified wood): 20
silt: 12, 85
siltstones: 12
silver: 26, 52, 57, 59, 89
glance: 90
horn: 90
minerals: 89
native: 26, 89
Silver Creek: 58
sinter, calcareous: 46
slate: 13
Smith County: 70
smoky quartz: 82, 83
soapstone: 40, 93
soils: 10
Solitario uplift: 42, 88
Sonora: 18
Caverns of: 19
specific gravity: 18, 99
specular hematite: 67
sphalerite: 57
Spiller mine: 74
Spindletop salt dome: 91
Spring Creek: 56
stalactites: 18, 19
stalagmites: 18, 19
Starr County: 84, 98
static metamorphism: 13
Stonewall County: 52
streak or powder of minerals: 17
streak plate: 17, 22
Streeter: 48, 94
striations: 81, 95
strontianite: 49
strontium: 49
sulfur: 29, 30, 31, 32, 34, 36, 81, 90
Sutton County: 18, 19
system: 2
T
talc: 28, 29, 34, 87, 93
schist: 87, 93
Talc Rock: 93
Taylor County: 45, 49, 60
Terlingua area: 46, 47, 49, 50, 65
Tertiary: 2, 3, 9, 21, 45, 49, 51, 52, 56, 57, 60, 70, 77, 78, 79,
83, 84, 85, 86, 90, 97, 98
terrazzo—
chips: 55, 76
floors: 88
tests, chemical (_see_ chemical tests)
thorium: 80
Thrall oil field: 88
time, geologic: 2, 3
tin: 47
topaz: 36, 38, 94
tourmaline: 33, 82, 94
Town Mountain: 95
Trans-Pecos area: 9, 10, 45, 60, 62, 69, 78, 82, 83, 84, 85, 87,
89, 90, 98
trap rock: 45
travertine: 46
Travis County: 20, 45, 46, 49, 68, 69, 70, 88
tremolite: 44, 93
Triassic: 3, 45, 87
Trinity County: 98
tufa, calcareous: 46
twinned crystals: 46, 63
tyuyamunite: 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, 78, 84
Wylie Mountains: 95
Y
yellow copper ore: 53
Yoakum County: 66
Young County: 58
yttrium: 80
Z
Zapata County: 83, 84
Zavala County: 86
zirconium: 80