Definition of magnesiohornblende in US English:

magnesiohornblende

noun

Mineralogy
  • 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.

Pronunciation

magnesiohornblende

/maɡˌniːzɪəʊˈhɔːnblɛnd/