The most common metallic brass-yellow mineral at this site. Usually massive material is inextricably mixed with chalcopyrite. Matrix-frozen crystals are impossible to trim into good specimens. Small to micro crystals are fairly common in vuggy ore rocks and may be found as attractive crystals.
Habit:
As massive materials in pods, veins, stringers and veinlets; as matrix-frozen cubic crystals; and as micro-crystals having a variety of shapes: cubes, octahedrons, pyritohedrons - and one malformed crystal the shape of the Washington Monument!
Colour:
Brass-yellow, metallic luster; may have slight surface tarnish.
Mascot Mine, Gorham, Coos County, New Hampshire, USA