amethyst
chalcedony
chert
citrine
crystal
false topaz
flint
jasper
onyx
silicon
natural glass
agate
alabaster
basalt
chalk
clay
felspar
gravel
gypsum
jade
lava
marble
mica
mineral
obsidian
ore
sandstone
shale
slate
Schwartz
aborts
bortz
contorts
courts
distorts
exhorts
extorts
fortes
forts
imports
ports
purports
quarts
reports
resorts
retorts
schwarz
shorts
snorts
sorts
sports
supports
swarts
thwarts
torts
transports
warts