: It typically registers between 5 and 6 on the Mohs scale.
. It is almost indistinguishable from tremolite except for its iron content; while tremolite is iron-poor and typically white or gray, the introduction of iron in actinolite produces its characteristic green to grayish-green color. actinolite
: As a monoclinic amphibole, it possesses perfect cleavage that can sometimes lead to the formation of "cleavage fragments" rather than true asbestos fibrils. Geological Occurrence : It typically registers between 5 and 6 on the Mohs scale