I. METALLIC LUSTER, STREAK COLORED
C—color H—hardness Remarks Name and
S—streak Cl—cleavage composition
F—fracture
A. Hardness not more than 2.5
C—lead gray H—2.5 Very heavy; occurs as Galena (31)
S—black Cl—cubic; crystals, grains, or PbS
perfect in 3 masses; easily
directions identified by color and
F—subconchoidal cleavage
or even
C—copper red H—2.5 Very heavy; apt to have Native copper
S—metallic, Cl—none green coating; distorted Cu
shiny F—jagged or wirelike forms;
malleable