Obsidian

Appearance:

Opaque or translucent; black, grey, brown or green

Common variations...

Flowering Obsidian (grey-white radial inclusions). Golden and silvery sheens can be caused by fine inclusions.

Esoteric beliefs and associations...

Associated with the night, darkness, revenge, hatred and impurity of all kinds. Often used in conjunction with spells and rituals that control destructive forces or matters of finance and addictions.

Other useful information...

Obsidian was named after the famed Roman, Obsius.

Physical properties...

Chemistry	Volcanic amorphous siliceous glassy rock
System/Structure	Large conchoidal (sharp edge)
Refractive Index	1.480 - 1.519
Specific Gravity	2.30 - 2.69
Mohs' Hardness	5.0 - 5.5