Chemical composition: Ca2(Mg,Fe2+)5Si8O22(OH)2
Color: Yellowish green, black.
Typical structure: Monoclinic. Prismatic or fibrous inside a fragile rock with many cracks. Some have a Cats Eye phenomenon.
The origin of the name is Greek meaning horn, given because of the long thin bar-like crystallization.
Provides protection from negative energies. Encourages smiles, sympathetic behavior and interaction.