Montana Bark Rough
Montana Bark is often referred to as Montana Bark Jasper, but it
is acutally a fossiliferous form of dolomite. It is the fossilized
remnant of an ancient streambed. It cuts and polishes easily and will
cut fine spheres, slabs and cabochons. This material is old stock
from our "archives".
Montana Bark takes an excellent polish with diamond or tin oxide.
MOHs hardness is 3.5 to 4.