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hornblende

[ hawrn-blend ]

noun

  1. a dark-green to black mineral of the amphibole group, calcium magnesium iron and hydroxyl aluminosilicate.


hornblende

/ ˈhɔːnˌblɛnd /

noun

  1. 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) 5 Si 6 (Si,Al) 2 O 22 (OH) 2


hornblende

/ hôrnblĕnd′ /

  1. 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) 8 O 22 (OH) 22 .


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Derived Forms

  • ˌhornˈblendic, adjective

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Other Words From

  • horn·blendic adjective

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Word History and Origins

Origin of hornblende1

From German, dating back to 1760–70; horn, blende

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Word History and Origins

Origin of hornblende1

C18: from German Horn horn + blende

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Example Sentences

Their geological formation is granite, with gneiss and mica slate, with clay slate, hornblende and primitive limestone overlying.

There were, also, some striking water-worn masses of granitical and hornblende porphyry.

They were succeeded by rocks of hornblende, which continued the whole distance to the head of the Grand Rapid.

If my observations were well taken it embraces, sparingly, orbicular masses of hornblende.

This latter embraces boulders of quartz and hornblende rock, along with limestones and sandstones.

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