hornblende
Hornblende is a common, greenish-black to black amphibole mineral, essentially calcium magnesium iron sodium aluminum aluminosilicate, which is found in igneous and metamorphic rock. Hardness 5.5; density 3.2.
Hornblende is a common, greenish-black to black amphibole mineral, essentially calcium magnesium iron sodium aluminum aluminosilicate, which is found in igneous and metamorphic rock. Hardness 5.5; density 3.2.
