hornblende

American  

[hawrn-blend] / ˈhɔrnˌblɛnd /

noun

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

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hornblende British  

/ 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

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hornblende Scientific  

/ hôrn′blĕnd′ /

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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Other Word Forms

• hornblendic
  adjective

Etymology

Origin of hornblende

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

Example Sentences

Other minerals, with hornblende being a good example, are longer in one direction, linear like a pencil or a needle, rather than a planar-shaped book.

From Textbooks • Jan. 1, 2017

Linear crystals, such as hornblende, tourmaline, or stretched quartz grains, can be arranged as part of a foliation, a lineation, or foliation/lineation together.

From Textbooks • Jan. 1, 2017

Diorite is identifiable by it’s Dalmatian-like appearance of black hornblende and biotite and white plagioclase feldspar.

From Textbooks • Jan. 1, 2017

The most common amphibole, hornblende, is usually black; however, they come in a variety of colors depending on their chemical composition.

From Textbooks • Jan. 1, 2017

Syenite, composed of honey-yellow felspar and hornblende, in very large crystals, the felspar passing into red and pink, and the whole rock mass penetrated by veins of the same material, but fine grained.

From In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions by McClintock, Francis Leopold