coarse
harsh
arenaceous
arenarious
atomic
breccial
brecciated
coarse-grained
comminuted
corpuscular
cross-grained
embryonic
evanescent
germinal
grained
grainy
graniform
granose
granulate
granulated
granulose
gravelly
gritty
gross
impalpable
imperceptible
imponderable
inappreciable
indiscernible
infinitesimal
intangible
invisible
microcosmic
microscopic
molecular
pebbled
pebbly
rough
sabulous
saccharine
saccharoid
sandy
shingled
shingly
subatomic
tenuous
thin
ultramicroscopic
unrefined
unseeable
fine-grained
grain
granulation
granule
amorphous
brittle
calcareous
chalky
crystalline
ferruginous
fibrous
flammable
friable
homogeneous
inorganic
milky
porous
powdery
reddish
siliceous
spongy
viscous
annular
massive