Epidote

Epidote is an aluminium iron silicate mineral, it’s crystal system is monoclinic and it often grows in prismatic crystals. It can also occur in fibrous, granular or massive habits. Its colour can be black, dark green or yellow green.
It forms in metamorphic and igneous rocks, in association with many other minerals, including Albite, Quartz, Chlorite, Garnet, Vesuvianite, Diopside and Calcite. Fine Epidote crystals have been found in Austria, Pakistan, Mexico, Norway, Mozambique and the USA.

Epidote is said to help assist in letting go patterns of negativity from the emotional body. It may help one overcome hopelessness and depressed emotional states and lends one a sense of optimism.