Labradorite (feldspar)

Appearance:

Opaque dark-grey to black. Has subtle plays of colour across the surface.

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.

Physical properties...

Chemistry	Sodium calcium aluminium silicate
System/Structure	Triclinic (rare, platy prismatic, usually compact aggregates)
Refractive Index	1.560 - 1.568
Specific Gravity	2.69 - 2.70
Mohs' Hardness	6.0 - 6.5