hornblende

horn·blende  (hôrnblnd)

n.

A green to black amphibolic mineral, CaNa(Mg,Fe)₄(Al,Fe,Ti)₃Si₆O₂₂(OH,F)₂, formed in the late stages of cooling in igneous rock.

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[German : Horn, horn (from Middle High German, from Old High German; see ker-¹ in Indo-European roots) + Blende, blende; see blende.]

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hornblende [ˈhɔːnˌblɛnd]

n

(Earth Sciences / Minerals) a black or greenish-black mineral of the amphibole group, found in igneous and metamorphic rocks. Composition: calcium magnesium iron sodium aluminium aluminosilicate. General formula: (Ca,Na)_2.3(Mg,Fe,Al)₅Si₆(Si,Al)₂O₂₂(OH)₂

[from German Horn horn + blende]

hornblendic  adj

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hornblende  (hôrnblnd)

A common, green to black mineral of the amphibole group. It has a variable composition and occurs in monoclinic crystals with a hexagonal cross-section, in fibrous forms, or in granular forms. Hornblende is found in many metamorphic and igneous rocks. Chemical formula: (Ca,Na)_2-3(Mg,Fe,Al)₅(Al,Si)₈O₂₂(OH)₂₂.

Thesaurus

Noun

1.

hornblende - a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron amphibole - a mineral or mineral variety belonging to the amphibole group amphibole group - a group of minerals with similar crystal structures containing a silicate chain and combinations of chiefly sodium and calcium and magnesium and iron and aluminum