Which characteristic is associated with Hornblende?

Hornblende is a complex silicate mineral that is commonly found in igneous and metamorphic rocks. One of its defining characteristics is its typical dark coloration, often appearing black or dark green. The crystals of hornblende usually have a distinctive elongated and prismatic shape, which can appear short and stout, contributing to the option describing its typical appearance.

Moreover, hornblende is part of the amphibole group of minerals, which includes a variety of other similar minerals but is characterized by its specific crystallization patterns, often forming in high-pressure and high-temperature conditions that are typical in metamorphic environments. Although hornblende can form in various geological processes, its most immediate visual identification comes from its dark coloration and crystal formation, making the description of it being typically black with short, stubby crystals accurate.

The other characteristics mentioned in the other choices do not accurately describe hornblende, as it is not colorless or primarily formed from sedimentary processes, nor is it exclusive to volcanic activity.