amphibole
am·phi·bole
noun \ˈam(p)-fə-ˌbōl\Definition of AMPHIBOLE
: any of a group of complex silicate minerals with like crystal structures that contain calcium, sodium, magnesium, aluminum, and iron ions or a combination of them—see crocidolite
Learn More About
Seen & Heard 
What made you want to look up amphibole? Please tell us where you read or heard it (including the quote, if possible).
