A
actinolite: 26
agate: 20, 28, 38
agatized wood: 27
allanite: 21
almandite: 22
amazonite: 23
amazon stone: 23
amber: 18
amethyst: 25
Amethyst Hill: 25
amorphous gemstones: 9
andalusite: 30
Arkansas: 19
Armstrong County: 21
augite: 18, 28
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
N
natural glass: 18, 24, 28
Needle Peak, Presidio County: 27
nivenite: 21
Nolan County: 19
Nueces River: 25
O
obsidian: 24, 29
Oklahoma: 29
opal: 20, 24
opalized wood: 35
orbicular jasper: 28
ounce: 7
P
Packsaddle Mountain: 23
Packsaddle schist: 30
palm wood: 21, 35
Palo Duro Canyon: 21
pavilion: 13, 16
facets: 16
girdle facets: 16, 17
pearl: 24-25
pegmatites and/or pegmatite dikes: 18, 20, 21, 22, 23, 26, 29, 39
petrified wood: 26
phantom crystals: 26
pistacite: 20
pleochroism: 5
point: 7
polishing: 17
lap: 13, 16
preformed stone: 16
preforming: 15
Presidio County: 20, 22, 24, 25, 26, 27, 28
properties of gemstones: 5-7
Q
quartz: 20, 21, 23, 25-28, 29, 30
smoky: 38
R
radioactive elements: 22
radioactivity of gadolinite: 21
rarity: 6
Reeves County: 26, 27
Rio Grande: 25
gravels of: 21, 27, 38
Valley: 27
rock crystal: 26
rose quartz: 26
S
Sabine River: 25
sanding: 12
sanidine: 28
sawing: 10
scheelite: 20
schorl: 30
size: 7
“skill” facets: 16
“slab” of gem materials: 11
Smithsonian Institution: 21
smoky quartz: 23, 26, 37
smoky topaz: 29
Spanish topaz: 29
specific gravity: 7
spinel: 18, 28
star facets: 17
step cut: 15
streak: 6
synthetic gems: 7
T
table facet: 13, 15
tektite (bediasite): 28-29, 39
tenacity: 6
thorogummite: 21
topaz: 23, 26, 29-30, 39, 40
quartz: 29
tourmaline: 26, 29, 30-31, 40
Town Mountain, Llano County: 26, 30
transparency: 6
Travis County: 19, 35
Trinity River: 25
tumbled gems: 17
turquoise: 31
U
U. S. National Museum: 30
V
value of gemstones: 6, 7
Val Verde County: 24
valverdites: 24
Van Horn, Hudspeth County: 27
W
Walker County: 29
Washington County: 20
Webb County: 21
weight, units of: 7, 25
Z
Zapata County: 38