One of the mysteries of the English language finally explained.
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.
1970s; earliest use found in Mineralogy Magazine. From magnesium + -o- + hornblende.
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