hornblende
noun
horn·blende ˈhȯrn-ˌblend 
: a mineral that is the common dark green to black variety of aluminous amphibole
broadly : amphibole sense 2
hornblendic
hȯrn-ˈblen-dik
adjective 
Example Sentences
Recent Examples on the Web Margaret sheltered in the lee of a large stone, gneiss studded with gleaming black hornblende, and rummaged in the giant rucksack on my back. 
Hugh Raffles, The New York Review of Books, 9 Oct. 2020
Hugh Raffles, The New York Review of Books, 9 Oct. 2020 Word History
Etymology
borrowed from German Hornblende, from Horn horn + Blende blende
First Known Use
1770, in the meaning defined above