breakable
brittle
brittle as glass
crackable
crimp
crisp
crispy
crumble
crumbly
crump
crushable
delicate
fissile
flimsy
fracturable
fragile
frail
frangible
lacerable
pulverizable
pulverulent
scissile
shatterable
shattery
shivery
splintery
triturable
vulnerable
alluvial
argillaceous
calcareous
chalky
chewy
clayey
crunchy
ferruginous
flaky
granular
gritty
loamy
marly
porous
powdery
pulpy
sandy
siliceous
spongy
stratified
well-drained
well-tilled