General formula:

Ca2(Mg,Fe,Al)5(Al,Si)8O22(OH)2

N° standard / mount: 21 / MAC
Standard elements: Al Ca Fe Mg Na Si
Mineral class: Silicates
Group: Amphiboles
Locality: Gore Mountain, New York, USA
Comments:

This mineral may contain some phases (Fe-richer silicate and FeO inclusions) which will be visible using BSE. These phases should be avoided during analysis.

Analysis:
Hornblende Analysis
Hornblende