Number 30

Color--------------------Tan

Luster------------------Nonmetallic, dull to waxy

Streak------------------None - White (harder than streak plate)

Hardness--------------7.0

Cleavage/-------------Fracture, conchoidal
Fracture

S.G.---------------------2.65

Special Properties---Has no crystal structure and is called amorphous.

Formula-----------------SiO2

Mineral Name---------Chert

Family-------------------Silicates

Uses---------------------Used by early man as weapons.

Chert