Number 24

Color--------------------Black

Luster-------------------Nonmetallic, very shiny

Streak-------------------White to light gray

Hardness---------------5.0 - 6.0

Cleavage/--------------Cleavage, 2 good cleavages at
Fracture                    angles of 56 and 124 degrees.

S.G.-----------------------2.9 - 3.4

Special Properties------Is a complex ferromagnesian silicate also known as a amphibole mineral.

Formula-------------------Ca,Na (Mg,Fe)4(Al,Fe,Ti)3Si6O22(O,OH)2

Mineral name------------Hornblende

Family---------------------Silicates

Uses-----------------------Very common rock forming mineral

Hornblende