Mineral Name

Hornblende

Chemical Formula

(Ca,Na)2-3(Mg,Fe,Al)5Si6(Si,Al)2O22(OH)2

Creator

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Color

various shades of dark green to black

Class

Article

Luster

vitreous to dull

Diaphaneity

translucent

Hardness

5-6

Cleavage

2 directions: {110} imperfect at 56 and 124 degrees

Fracture

uneven

Density

3-3.4

Crystal Shape

crystals prismatic, may be columnar or fibrous

Crystal System

Monoclinic

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