1. Galena Magnetite Graphite Chalcopyrite Pyrite Hematite Limonite
Name _______________________
3 perfect cleavages 90o, silver gray, H 2.5, density D 7.6
Galena
Black, gray, or greenish black streak
Magnetite
Magnetic, black to dark gray H 6, D 5.2
Graphite
Steel gray, soft marks paper, H 1, D 2
Metallic Luster
Golden Yellow tarnish purple, H D 4.3
Chalcopyrite
Brass Yellow masses or cubic crystals, striated facets on crystals common H 6 D 5, “fools gold”, NO ACID
Pyrite
Red to reddish-brown streak
Black to Steel gray, red to red brown streak, H 5 – 6 D 5, uneven fracture
Hematite
Limonite
Yellow-brown streak
Yellow brown or black, H , D