Number 3

Color--------------------Silver gray

Luster------------------Metallic, very shiny

Streak------------------lead gray

Hardness--------------2.5

Cleavage/-------------Cleavage, 3 perindicular
Fracture

S.G.---------------------7.4 - 7.6

Special Properties---Bright metallic luster

Formula-----------------PbS

Mineral Name---------Galena

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

Uses---------------------Early radio devices

Galena