Hornblende
ID: 123
Hornblende
Chemical Formula
General formula for a complex amphibole group (highly variable)
Hardness (Mohs)
5-6
Crystal System
Monoclinic
Streak
Grey-green to grey-brown
Luster
Vitreous to dull
Diaphaneity
Translucent to opaque
Color
Dark green, brownish-green, black
Crystal Habit / Mode of Occurrence
Prismatic, often long and columnar crystals; massive, granular, fibrous
Fun Facts
Hornblende is not a single mineral but a group of minerals within the amphibole supergroup.