Ferro-Hornblende – Schausammlung

Please note: This hornblende is not shaped asbesos like.

Formula	Ca₂[(Fe ²⁺;Mg)₄Al](Si₇Al)O₂₂(OH)₂
Origin	Fuerteventura
Description	idiomorphic black Ferro-Hornblende
Classification (Lapis)	Amphiboles
Crystal System	monoclinic
Hardness	5,0 – 6,0
Colour	Green, greenish brown
Streak	white
Luminescence	none observed
Lustre	vitreous
Transparency (Opacity)	translucent to opaque
Cleavage	perfect
Fracture	conchoidal
Magnetism	negative
Geological Setting	From granites, granodiorites, and metabasalts
Specific Gravity	3,30 g/cm³