Number 4

Color--------------------Brassy yellow

Luster------------------Metallic, very shiny to a dull shine

Streak------------------Black to greenish black

Hardness--------------3.5 - 4.0

Cleavage/-------------Fracture, irregular to rough
Fracture

S.G.---------------------4.1 - 4.3

Special Properties---Fairly brittle.

Formula-----------------CuFeS2

Mineral Name---------Calcopyrite

Family-------------------Sulfides

Uses---------------------Cheap jewelry

Calcopyrite