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hornblende

American

[hawrn-blend] / ˈhɔrnˌblɛnd /

noun

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

hornblende British

/ ˈhɔːnˌblɛnd /

noun

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

hornblende Scientific

/ hôrn′blĕnd′ /

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 .

Other Word Forms

hornblendic

adjective

Etymology

Origin of hornblende

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

Vocabulary lists containing hornblende

Rocks and Minerals - Middle School and High School

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023