Obsidian

Obsidian

Hardness ( Moh )

" 5 - 5.5

Crystal System

None

Specific Gravity

2.30 - 2.60

Refractive Index

1.450 - 1.520

Birefringence

Family

Volcanic Glass

Colour(s)

Black

Cleavage

Francture Type

Conchoidal

Luster

Streak

White

Transparency

Translucent

Formula

Sio2

Country

Found In