Dims: 3" x 1-3/4" x 1-1/4"
Wt: 3.1 oz
Calumet Iron Mine, Salida, Chaffee Co., Colorado, U.S.A.
A variety of Actinolite that is known as Uralite makes up this specimen. Most of these that I have seen come from the Calumet Iron Mine, and this one is no exception. It consists of a matrix of massive Uralite, on which are growing hundreds of tiny needlelike prisms of the mineral. They have a pseudotetragonal form with a basal termination that is slightly angled. The crystals all have a gray-green coloration and a fibrous appearance if viewed under a high-power loupe or a microscope. Their luster is pearly to waxy in appearance and there is noticeable damage to a substantial number of the crystals.