magnesiohornblende
/maɡˌniːzɪəʊˈhɔːnblɛnd/Mineralogy
noun
A hornblende belonging to the series Ca2(Mg,Fe+2)4Al(Si7Al)O22(OH,F)2 in which the proportion of magnesium is equal to or greater than that of iron, occurring naturally as green or greenish-black prismatic crystals and in massive form.
Origin
1970s; earliest use found in Mineralogy Magazine. From magnesium + -o- + hornblende.